Royal Enfield 143906/C – Front Fork Cover Tube Bush (Dust Cover) for Bullet, Classic, Electra, Thunderbird, Continental GT & Old Models

SOLD AS A SET OF 2 PCS
Royal Enfield part 143906/C is the genuine “COVER TUBE BUSH” used in the front fork cover tube / steering column area on a wide range of Royal Enfield motorcycles across CI, AVL and UCE generations. Bike-Parts-RoyalEnfield lists 143906/C as the current valid part number, superseding earlier 143906 and 143906/B references.

Specialist sites and microfiche from Europe describe 143906/C as a dust cover for the fork cover tube/steering column (“cache poussière couvre tube / cover tube bush”), confirming its location and function around the fork shrouds and headlamp/steering area. The Spares Company fitment list for 143906-B (factory superseded by 143906/C) plus Safex ENFIELDGP and HKT/EBay sellers all show this bush used on Standard 350/500, Electra 4S/5S, Lightning 500/535, Machismo A350/A500, Thunderbird CI & UCE, Bullet 350/500 UCE, Classic 350, Classic 500 EFI and Continental GT 535, as well as Bullet Trial 500, Pegasus, Redditch and 500 E3/E4 variants.

Functionally, this small but critical plastic bush centers and cushions the fork cover tube/steering stem area, reducing play, rattles and metal-to-metal contact while helping to keep dust and water out of the steering head. It’s often overlooked during fork or headlamp casquette overhauls, but worn bushes can cause annoying noises and sloppy feel at the front end. Replacing them with genuine 143906/C ensures correct dimensions and long-term durability, whether you’re restoring an old CI Bullet or refreshing the front end of a Classic 350/500 or Thunderbird.

Key Features 

• Genuine OEM part: Royal Enfield 143906/C – COVER TUBE BUSH, the factory-specified bush for front fork cover tube / steering column area.

• Wide multi-generation compatibility across CI, AVL and UCE singles, including Bullet, Classic, Electra, Thunderbird and Continental GT 535 models (see table).

• Designed to cushion the fork cover tube, reducing vibration, rattle and metal-to-metal contact around the steering column.

• Helps keep dust and moisture out of the steering head / upper fork area, extending life of bearings and guiding sleeves.

• Direct replacement for earlier references 143906 and 143906/B, confirmed by Royal Enfield microfiche and Bike-Parts-RoyalEnfield.

• Ideal to replace during front fork overhaul, headlamp casquette rebuild or steering bearing replacement to restore a tight, rattle-free front end.

• OEM dimension and material for easy, no-modification fit on listed models – avoids guesswork of generic/unbranded bushes.

SOLD AS A SET OF 2 PCS 

Compatibility Table 

Note: 143906/C supersedes 143906 and 143906/B – fitment below is compiled from RE microfiche + Indian & EU dealer sites + major online sellers.

1. UCE Singles (India & Global)

2. 500 EFI E3/E4 & Special Editions (EU/Export)

3. Older CI / AVL (India)

PLEASE CONFIRM PART NUMBER BEFORE PLACING AN ORDER 

FAQs 

Q1. What does the Royal Enfield 143906/C cover tube bush actually do?
It sits around the front fork cover tube / steering column area, acting as a plastic guide and dust cover. It reduces play and metal-to-metal contact between the cover tube and yokes/headlamp casquette, cutting down front-end rattles and helping keep dust and water away from the steering bearings.

Q2. How can I confirm if 143906/C fits my bike?
Check your Royal Enfield parts book or microfiche for “COVER TUBE BUSH 143906/C” or its older codes (143906, 143906/B). Cross-check against the compatibility list above: most Bullet/Classic/Electra/Thunderbird UCE, Continental GT 535, and many older CI/AVL Bullets (Std, Electra, Machismo, Lightning, Campus, TB KS/ES) use this bush. When in doubt, share your VIN + model/year with us before ordering.

Q3. Do I need to buy one bush or a full set?
From the factory, these bushes are sold per piece, but most forks/headlamp assemblies use them in pairs. Many aftermarket and OEM sellers therefore supply them as 2-pc kits. We recommend replacing them in pairs (left & right / upper & lower) for even wear and best results.

Q4. Will this fit my J-Series Classic 350 Reborn or Meteor 350?
No confirmed data. J-Series bikes use a different front-end architecture and we do not list 143906/C for them. Until Royal Enfield publishes microfiche explicitly showing 143906/C on J models, treat fitment as ❌ not compatible / ❓ unconfirmed and avoid guessing.