{"product_id":"royal-enfield-thunderbird-350-twinspark-common-key-lock-set-147548-b","title":"Royal Enfield Thunderbird 350 TwinSpark Common Key \/ Complete Lock Set 147548\/B","description":"\u003ch1\u003eRoyal Enfield Thunderbird 350 TwinSpark Common Key \/ Complete Lock Set 147548\/B\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eGenuine Royal Enfield 147548\/B – COMMEN KEY SET THUNDER BIRD.\u003c\/strong\u003e This is the genuine \u003cstrong\u003eThunderbird common-key \/ lock-set service kit\u003c\/strong\u003e used on catalogue-specified Royal Enfield Thunderbird TwinSpark applications. It is the \u003cstrong\u003enew-type SB-478 specification\u003c\/strong\u003e and supersedes the earlier 147548\/A and older 521153\/A common-key-set references.\u003c\/p\u003e\n\u003cp\u003eThis is not simply a duplicate ignition key. A \u003cstrong\u003ecommon key set\u003c\/strong\u003e is used when the motorcycle's matched lock\/key system requires replacement so the applicable locks operate from the same key family. It is particularly relevant when keys are lost, locks are damaged, a motorcycle has mismatched locks, or an older Thunderbird is being restored to an OE-style matched lock system.\u003c\/p\u003e\n\u003ch2\u003ePart Identification\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRoyal Enfield\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e147548\/B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBase Search Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e147548\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFactory \/ OEM Description\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCOMMEN KEY SET THUNDER BIRD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBuyer Search Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThunderbird common key set \/ complete lock set \/ ignition key lock kit \/ lock-and-key set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrimary Application\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRoyal Enfield Thunderbird 350 TwinSpark \/ TBTS where 147548\/B is specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew Type – SB-478\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTank-Lock Generation Note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew-type Bakelite-base configuration in the Thunderbird TwinSpark catalogue\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColour \/ Finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNot a colour-specific body part; OEM\/seller references do not specify a single cosmetic colour\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eElectrical \/ Security Category\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLock \u0026amp; Key \/ Ignition \u0026amp; Security\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eShort Hook\u003c\/h2\u003e\n\u003cp\u003eRestore a matched OEM-style lock-and-key system on your Thunderbird with genuine \u003cstrong\u003e147548\/B\u003c\/strong\u003e – Royal Enfield's new-type Thunderbird common key set, replacing the earlier 147548\/A \/ 521153\/A lock-set references where specified.\u003c\/p\u003e\n\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eRoyal Enfield 147548\/B Common Key Set\u003c\/strong\u003e is a genuine lock\/key service part for the \u003cstrong\u003eThunderbird TwinSpark\u003c\/strong\u003e platform. Royal Enfield's Thunderbird TwinSpark Spare Parts Catalogue Version 3.0 identifies 147548\/B as \u003cstrong\u003eCommon Key Set – Thunderbird\u003c\/strong\u003e, quantity one, with the note \u003cstrong\u003eSB-478, New Type, Tank Lock Bakelite Base\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe same catalogue shows the earlier \u003cstrong\u003e521153\/A Common Key Set\u003c\/strong\u003e as the \u003cstrong\u003eold-type Melamine-base\u003c\/strong\u003e version and directs it to \u003cstrong\u003e147548\/B\u003c\/strong\u003e. Genuine-parts dealer data also shows \u003cstrong\u003e147548\/A replaced by 147548\/B\u003c\/strong\u003e. This means the \/B suffix is not cosmetic: it is the current service reference and should remain exact in the Shopify SKU.\u003c\/p\u003e\n\u003cp\u003eAnother useful service cross-reference is \u003cstrong\u003e521145\/A Ignition Switch Assembly with Key\u003c\/strong\u003e. Current genuine-parts data directs this older ignition-switch reference to \u003cstrong\u003e147548\/B\u003c\/strong\u003e, so customers searching for the old ignition-switch number may legitimately arrive at this current common-key-set service part.\u003c\/p\u003e\n\u003cp\u003eRoyal Enfield also used separate common-key-set families for Standard and Electra motorcycles. Therefore, visually similar lock kits or a common Royal Enfield key shape do \u003cstrong\u003enot\u003c\/strong\u003e prove interchangeability.\u003c\/p\u003e\n\u003ch2\u003eWhat This Product Is\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Royal Enfield \u003cstrong\u003eThunderbird common key \/ lock set\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eCurrent service reference \u003cstrong\u003e147548\/B\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eNew-type SB-478 Thunderbird lock-set specification.\u003c\/li\u003e\n\u003cli\u003eReplacement for older references where Royal Enfield officially directs them to 147548\/B.\u003c\/li\u003e\n\u003cli\u003eSuitable for restoring a matched lock\/key system when the exact Thunderbird catalogue specifies this kit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat This Product Is Not\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eNot a duplicate-key cutting service.\u003c\/li\u003e\n\u003cli\u003eNot a blank key only.\u003c\/li\u003e\n\u003cli\u003eNot a single ignition switch only unless the service supersession specifically directs that old reference to this complete set.\u003c\/li\u003e\n\u003cli\u003eNot the Standard common-key set \u003cstrong\u003e147545\/A\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eNot the Electra common-key set \u003cstrong\u003e147546\/A\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eNot a universal Royal Enfield lock set.\u003c\/li\u003e\n\u003cli\u003eNot automatically correct for Thunderbird X or later-generation lock systems.\u003c\/li\u003e\n\u003cli\u003eExact physical locks\/components inside the sealed genuine kit should be verified before promising an individual sub-component to the buyer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExact genuine SKU:\u003c\/strong\u003e 147548\/B.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM description:\u003c\/strong\u003e COMMEN KEY SET THUNDER BIRD.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew-type SB-478\u003c\/strong\u003e specification.\u003c\/li\u003e\n\u003cli\u003eCatalogue note identifies a \u003cstrong\u003eBakelite-base tank-lock configuration\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eSupersedes \u003cstrong\u003e147548\/A\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eSupersedes older Thunderbird common-key-set reference \u003cstrong\u003e521153\/A\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eCurrent service data also directs older \u003cstrong\u003e521145\/A ignition switch with key\u003c\/strong\u003e to 147548\/B.\u003c\/li\u003e\n\u003cli\u003eSeparates Thunderbird lock-set requirements from Standard and Electra common-key-set families.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuyer Search Names \/ Internal Search Keywords\u003c\/h2\u003e\n\u003cp\u003e147548\/B, 147548B, 147548, 147548\/A, 521153\/A, 521145\/A, Royal Enfield Thunderbird key set, Thunderbird 350 key set, Thunderbird 350 lock set, Thunderbird TwinSpark lock set, TBTS common key set, Thunderbird ignition lock set, Thunderbird complete lock kit, Thunderbird ignition key set, Royal Enfield common key set, Royal Enfield lock set complete, Thunderbird petrol tank lock key set, Thunderbird steering lock key set, old Thunderbird key lock set.\u003c\/p\u003e\n\u003ch2\u003eConfirmed Compatibility\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModel \/ Application\u003c\/th\u003e\n\u003cth\u003eStatus\u003c\/th\u003e\n\u003cth\u003eFitment Detail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRoyal Enfield Thunderbird TwinSpark \/ TBTS\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eConfirmed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e147548\/B is listed directly in the Thunderbird TwinSpark Spare Parts Catalogue as Common Key Set – Thunderbird.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThunderbird 350 UCE \/ TwinSpark applications using 147548\/B\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eConfirmed application family\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSupported by Thunderbird\/TBTS catalogue and specialist genuine-parts listings. Match exact old part \/ EPC before dispatch.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOlder Thunderbird KS \/ ES applications using 170559\/A where 147548\/B is the catalogue alternate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eConfirmed legacy cross-reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRetired-model Royal Enfield catalogue identifies 147548\/B as the alternate service reference for the relevant common-key-set family.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eFitment Not Confirmed \/ Check Before Ordering\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModel \/ Situation\u003c\/th\u003e\n\u003cth\u003eRequired Check\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eThunderbird 500\u003c\/td\u003e\n\u003ctd\u003eThe 147548\/B part family is strongly tied to Thunderbird\/TBTS, but do not advertise all Thunderbird 500 variants without exact EPC \/ old-part confirmation.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThunderbird X 350 \/ Thunderbird X 500\u003c\/td\u003e\n\u003ctd\u003eLater Thunderbird X motorcycles can use different lock\/key systems. Match exact part number before ordering.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVery early Thunderbird \/ T-1 restoration\u003c\/td\u003e\n\u003ctd\u003eCheck whether the motorcycle has an older 521153\/A \/ 521145\/A \/ 170559\/A arrangement and whether the current service conversion to 147548\/B is appropriate.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotorcycle with modified tank cap, ignition switch or side locks\u003c\/td\u003e\n\u003ctd\u003eDo not assume a complete genuine common-key set will match previously modified aftermarket locks.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eNot Compatible \/ Do Not Order For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoyal Enfield Standard \/ old Bullet STD\u003c\/strong\u003e when 147545\/A common-key set is specified.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoyal Enfield Electra \/ Machismo\u003c\/strong\u003e when 147546\/A common-key set is specified.\u003c\/li\u003e\n\u003cli\u003eClassic 350 Reborn \/ J-Series.\u003c\/li\u003e\n\u003cli\u003eBullet 350 J-Series.\u003c\/li\u003e\n\u003cli\u003eMeteor 350.\u003c\/li\u003e\n\u003cli\u003eHunter 350.\u003c\/li\u003e\n\u003cli\u003eHimalayan 411 \/ Scram 411.\u003c\/li\u003e\n\u003cli\u003eHimalayan 450 \/ Guerrilla 450.\u003c\/li\u003e\n\u003cli\u003eInterceptor 650 \/ Continental GT 650.\u003c\/li\u003e\n\u003cli\u003eSuper Meteor 650 \/ Shotgun 650 \/ Bear 650 \/ Classic 650.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePart Number \/ Supersession Notes\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eReference\u003c\/th\u003e\n\u003cth\u003eStatus \/ Relationship\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e147548\/B\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent genuine Thunderbird common-key-set service reference.\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e147548\/A\u003c\/td\u003e\n\u003ctd\u003eOlder COMMEN KEY SET THUNDER BIRD; genuine-parts data shows replacement by 147548\/B.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e521153\/A\u003c\/td\u003e\n\u003ctd\u003eOlder COMMON KEY SET T-1; Thunderbird TwinSpark catalogue directs it to 147548\/B. Old-type Melamine-base configuration.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e521145\/A\u003c\/td\u003e\n\u003ctd\u003eOlder Ignition Switch Assembly with Key; current genuine-parts data directs this reference to 147548\/B.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e170559\/A\u003c\/td\u003e\n\u003ctd\u003eOlder common-key-set reference in retired-model catalogue; 147548\/B appears as its alternate service number for relevant applications.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eHigh-Risk Similar Parts – Do Not Mix Up\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003cth\u003eFactory Description\u003c\/th\u003e\n\u003cth\u003eUse\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e147548\/B\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCOMMEN KEY SET THUNDER BIRD\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThis product – Thunderbird common key \/ lock set.\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e147545\/A\u003c\/td\u003e\n\u003ctd\u003eCOMMEN KEY SET STD\u003c\/td\u003e\n\u003ctd\u003eStandard \/ STD common-key-set family.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e147546\/A\u003c\/td\u003e\n\u003ctd\u003eCOMMEN KEY SET ELECTRA\u003c\/td\u003e\n\u003ctd\u003eElectra common-key-set family.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e597127\u003c\/td\u003e\n\u003ctd\u003eSide Panel Lock with Keys\u003c\/td\u003e\n\u003ctd\u003eIndividual lock component, not automatically the complete common-key set.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e597129\u003c\/td\u003e\n\u003ctd\u003eSteering Lock with Keys\u003c\/td\u003e\n\u003ctd\u003eIndividual lock component, not automatically the complete common-key set.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e597128 \/ 143180\/C\u003c\/td\u003e\n\u003ctd\u003eFuel Tank Cap with Key\u003c\/td\u003e\n\u003ctd\u003eFuel-cap \/ tank-lock component; not the same as ordering the full common-key kit.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e999991\u003c\/td\u003e\n\u003ctd\u003eBlank Key Set\u003c\/td\u003e\n\u003ctd\u003eKeys only; not the complete lock set.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eWhen Should This Be Replaced?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOriginal motorcycle keys are lost and a complete matched lock\/key solution is required.\u003c\/li\u003e\n\u003cli\u003eIgnition or other applicable locks are damaged or jammed.\u003c\/li\u003e\n\u003cli\u003eMotorcycle has mismatched locks requiring different keys.\u003c\/li\u003e\n\u003cli\u003eOlder lock-set components are worn and unreliable.\u003c\/li\u003e\n\u003cli\u003eRestoration requires an OE-style common-key system.\u003c\/li\u003e\n\u003cli\u003eOld part \/ repair estimate specifies 147548\/A, 521153\/A or another officially superseded Thunderbird reference.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eRecommended Related Parts \/ Checks\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIgnition-switch wiring connector and harness condition.\u003c\/li\u003e\n\u003cli\u003eSteering-lock mounting screws and lock mounting area.\u003c\/li\u003e\n\u003cli\u003eFuel tank cap \/ tank-lock type and base generation.\u003c\/li\u003e\n\u003cli\u003eSide-panel lock mounting points where applicable.\u003c\/li\u003e\n\u003cli\u003eExisting aftermarket locks that may prevent a common genuine key system from being installed correctly.\u003c\/li\u003e\n\u003cli\u003eTank and side-panel alignment before replacing locks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e1 × Genuine Royal Enfield 147548\/B Thunderbird Common Key Set, as supplied in the sealed genuine package.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant contents note:\u003c\/strong\u003e the catalogue identifies 147548\/B as the complete \u003cem\u003eCommon Key Set – Thunderbird\u003c\/em\u003e, but separate ignition, fuel-cap, side-panel, steering-lock and key references also exist within the same lock-system diagram. Therefore, \u003cstrong\u003ephysically verify the sealed kit contents before promising a specific number or combination of individual locks\/keys to a customer\u003c\/strong\u003e. The listing should sell the genuine factory kit by part number rather than inventing unverified box contents.\u003c\/p\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCompare the old lock system, key profile, mounting points and ignition connector before removing all original locks.\u003c\/li\u003e\n\u003cli\u003eIf converting from the older 521153\/A configuration, confirm the new-type SB-478 arrangement is correct for the motorcycle.\u003c\/li\u003e\n\u003cli\u003eDo not force the steering lock, tank lock or side locks into incompatible brackets.\u003c\/li\u003e\n\u003cli\u003eInspect ignition wiring for previous splices, overheating or aftermarket modifications.\u003c\/li\u003e\n\u003cli\u003eBefore final reassembly, test every supplied lock\/key function that belongs to the genuine kit.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended for ignition and steering-lock work.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eReturn-Prevention Note\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eConfirm 147548\/B from the motorcycle's parts catalogue, old genuine part, packet label or VIN\/chassis-based parts lookup before ordering.\u003c\/strong\u003e Thunderbird, Thunderbird TwinSpark and Thunderbird X span different generations and lock systems. Correctly supplied electrical\/security spare parts are not returnable or exchangeable because of incorrect selection, connector\/lock mismatch, installation attempt, mechanic recommendation or change of mind. Orders cannot be cancelled once placed. Eligible wrong-item or damaged-item claims require applicable proof and a complete unboxing video within 24 hours under store policy.\u003c\/p\u003e\n\u003ch2\u003eFAQs\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ1. What is Royal Enfield part 147548\/B?\u003c\/strong\u003e\u003cbr\u003e It is the genuine Royal Enfield \u003cstrong\u003eCommon Key Set – Thunderbird\u003c\/strong\u003e, also searched as a Thunderbird complete lock set, ignition lock\/key kit or matched common-key set.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2. Which bike is 147548\/B primarily for?\u003c\/strong\u003e\u003cbr\u003e It is directly catalogued for the \u003cstrong\u003eRoyal Enfield Thunderbird TwinSpark \/ TBTS\u003c\/strong\u003e lock system and is commonly sold for Thunderbird 350 applications where this exact number is specified.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3. Is 147548\/B the old type or new type?\u003c\/strong\u003e\u003cbr\u003e It is the \u003cstrong\u003enew-type SB-478\u003c\/strong\u003e specification. The catalogue notes a \u003cstrong\u003eBakelite-base tank-lock arrangement\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ4. What was the old Thunderbird common-key-set number?\u003c\/strong\u003e\u003cbr\u003e The Thunderbird TwinSpark catalogue shows \u003cstrong\u003e521153\/A\u003c\/strong\u003e as the old-type common key set with Melamine base and directs it to 147548\/B. Genuine-parts data also shows 147548\/A replaced by \/B.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ5. Does 147548\/B replace 147548\/A?\u003c\/strong\u003e\u003cbr\u003e Yes. Current genuine-parts dealer data explicitly identifies 147548\/B as the replacement for 147548\/A.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ6. What about ignition switch 521145\/A?\u003c\/strong\u003e\u003cbr\u003e Current genuine-parts service data directs the older 521145\/A Ignition Switch Assembly with Key to 147548\/B, so verify whether the complete current service kit is required for that motorcycle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ7. Is this the same as 147545\/A?\u003c\/strong\u003e\u003cbr\u003e No. 147545\/A is the \u003cstrong\u003eCommon Key Set STD\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ8. Is this the same as 147546\/A?\u003c\/strong\u003e\u003cbr\u003e No. 147546\/A is the \u003cstrong\u003eCommon Key Set Electra\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ9. Is this only one ignition lock?\u003c\/strong\u003e\u003cbr\u003e No. The factory description is a \u003cstrong\u003ecommon key set\u003c\/strong\u003e. However, physically verify the genuine packet before promising specific individual lock contents.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ10. Does this fit Thunderbird X?\u003c\/strong\u003e\u003cbr\u003e Do not assume so. Thunderbird X is a later variant and its exact lock-system part number should be checked before purchase.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ11. Does this fit Thunderbird 500?\u003c\/strong\u003e\u003cbr\u003e Do not broadly advertise all Thunderbird 500 variants without EPC confirmation. Use 147548\/B only where the exact parts catalogue or existing genuine part confirms it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ12. Can I buy this just for a duplicate key?\u003c\/strong\u003e\u003cbr\u003e No. This is a lock\/key set service part, not a key-copying service or a blank-key-only listing.\u003c\/p\u003e\n\u003cp\u003eRoyal Enfield, Genuine Royal Enfield Parts, 147548\/B, 147548B, 147548, 147548\/A, 521153\/A, 521145\/A, 170559\/A, COMMEN KEY SET THUNDER BIRD, Common Key Set Thunderbird, Thunderbird 350, Thunderbird TwinSpark, Thunderbird TBTS, Thunderbird Key Set, Thunderbird Lock Set, Thunderbird Complete Lock Set, Thunderbird Ignition Key Set, Thunderbird Ignition Lock, Thunderbird Petrol Tank Lock, Thunderbird Steering Lock, Royal Enfield Common Key Set, Royal Enfield Lock Kit, Old Thunderbird Spares\u003c\/p\u003e\n\u003cp\u003eGenuine Royal Enfield 147548\/B Thunderbird 350 TwinSpark common key complete lock set\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRoyal Enfield\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMPN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e147548\/B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCustom Product\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFalse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGoogle Product Category\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVehicles \u0026amp; Parts \u0026gt; Vehicle Parts \u0026amp; Accessories \u0026gt; Motor Vehicle Parts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eCompetitor Gap Analysis\u003c\/h2\u003e\n\u003cp\u003eMost marketplace listings simply say “Thunderbird common key set” and stop there. This listing is substantially stronger because it explains the \u003cstrong\u003enew-type SB-478 specification\u003c\/strong\u003e, identifies the \u003cstrong\u003eBakelite-base versus old Melamine-base generation difference\u003c\/strong\u003e, documents 147548\/A and 521153\/A supersession, captures the 521145\/A ignition-switch service cross-reference, separates Standard 147545\/A and Electra 147546\/A kits, distinguishes a common-key set from individual fuel\/steering\/side-panel locks, and avoids falsely promising unverified box contents.\u003c\/p\u003e\n\u003ch2\u003eResearch \/ Accuracy Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRoyal Enfield Thunderbird TwinSpark Spare Parts Catalogue Version 3.0: 147548\/B = Common Key Set – Thunderbird; New Type, SB-478, Tank Lock Bakelite Base.\u003c\/li\u003e\n\u003cli\u003eThe same catalogue shows 521153\/A Common Key Set as the old-type Melamine-base configuration superseded by 147548\/B.\u003c\/li\u003e\n\u003cli\u003eCurrent genuine-parts data shows 147548\/A replaced by 147548\/B.\u003c\/li\u003e\n\u003cli\u003eCurrent service lookup directs 521145\/A Ignition Switch Assembly with Key to 147548\/B.\u003c\/li\u003e\n\u003cli\u003eRoyal Enfield retired-model catalogue shows 147548\/B as an alternate service number for the relevant older Thunderbird common-key-set family.\u003c\/li\u003e\n\u003cli\u003eSeparate common-key-set references exist for Standard (147545\/A) and Electra (147546\/A), so they have not been merged.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003c\/h2\u003e","brand":"Royal Enfield","offers":[{"title":"Default Title","offer_id":52087238983975,"sku":"147548\/B","price":912.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/EA7A9099-41B9-43F5-B8EA-91EE001A7DAD.jpg?v=1789576897","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-thunderbird-350-twinspark-common-key-lock-set-147548-b","provider":"UNDER THE HOOD","version":"1.0","type":"link"}