Hero Genuine Chain & Sprocket Kit 20K710S – Hero Super Splendor 125 (14T/42T, 428-108L) – OEM Quality Drive System

Is your Hero Super Splendor experiencing chain noise, jerky throttle response, or frequent slack adjustments? The Hero Genuine Chain & Sprocket Kit (Part No. 20K710S) is the factory-engineered solution to restore smooth, reliable power delivery to your trusted 125cc commuter. Designed specifically for the Super Splendor, this complete drive system replacement eliminates the common problems of worn chains—rattling sounds, power loss, sluggish acceleration, and excessive maintenance intervals.

This genuine Hero MotoCorp kit brings back the crisp throttle feel and efficient power transfer your bike had when new. Manufactured to exact OEM specifications with heat-treated sprockets and a precision-engineered 428-pitch chain, it offers superior wear resistance and longer service life compared to aftermarket alternatives. The 14-tooth front sprocket and 42-tooth rear sprocket maintain the factory gear ratio, ensuring your Super Splendor's renowned fuel efficiency (60-65 kmpl) and balanced performance remain intact for both city commutes and occasional highway rides.

Why buy from Under The Hood? We're Varanasi's trusted motorcycle parts specialists, offering only 100% genuine Hero products sourced directly from authorized channels. Every kit is carefully inspected and packed to reach you in perfect condition. Our team provides expert fitment guidance and after-sales support, ensuring you get the right part and install it correctly the first time. For local customers, professional installation is available at our studio.

Key Features

• Genuine Hero OEM Part (20K710S): Factory-engineered complete drive system kit with authentic Hero MotoCorp quality—not a local duplicate or aftermarket substitute
• Perfect Factory Fitment: Pre-matched 14T front sprocket, 42T rear sprocket, and 428-pitch, 108-link chain engineered specifically for Hero Super Splendor 125
• SCM415 Alloy Steel Construction: Sprockets made from premium-grade chrome-molybdenum steel with flame-hardened teeth for exceptional wear resistance and longer life
• Precision 428-Pitch Chain: High-tensile strength drive chain with rust-preventive coating and sealed rollers that minimize friction and maximize power transfer efficiency
• Eliminates Common Drive Problems: Solves chain slap noise, jerky pickup, tight spots, frequent adjustment needs, and power loss from worn components
• Maintains Factory Performance: Preserves the Super Splendor's class-leading fuel economy (60-65 kmpl), smooth acceleration, and comfortable city-highway balance
• Heat-Treated Sprocket Teeth: Flame-hardened tooth profiles resist hooking and elongation, ensuring consistent engagement through 25,000+ km of normal use
• Corrosion-Resistant Finish: All components feature protective coatings that resist rust, road salt, and environmental deterioration even in monsoon conditions
• Complete Ready-to-Install Kit: Includes front sprocket, rear sprocket, chain, and master link—everything needed for a professional-quality drivetrain refresh
• Lower Maintenance Burden: Genuine Hero quality means longer lubrication intervals, reduced cleaning frequency, and fewer roadside adjustments
• Smooth, Quiet Operation: Precision-matched components deliver near-silent power transmission with minimal vibration and drivetrain noise
• Authorized Distribution: Sourced through official Hero channels and backed by Under The Hood's commitment to authentic parts and customer support

Compatibility Table

Note: This kit (20K710S) has been Hero MotoCorp's standard chain & sprocket specification for Super Splendor 125 across all generations from 2005 to present. If your bike has non-standard modifications (larger rear sprocket, aftermarket wheels), please verify fitment with your mechanic or contact Under The Hood before ordering.

Variants

This Hero Genuine Kit comes in a single OEM-standard configuration:

• 14-tooth front sprocket (Part: 23801-GF6-000)
• 42-tooth rear sprocket (Part: 41201-KTC-900)
• 428-pitch, 108-link chain (Part: 40530-KCC-900)

Why this configuration? Hero has engineered this specific ratio (14T/42T) to deliver the optimal balance for Super Splendor riders:

• City commuters benefit from smooth acceleration off traffic lights and easy gear shifts in congested urban conditions
• Mixed-use riders (city + occasional highway touring) enjoy predictable power delivery with minimal vibration at cruising speeds (60-80 km/h)
• Fuel economy focused owners maintain the bike's legendary 60-65 kmpl average while carrying pillion or light luggage

Unlike aftermarket kits that alter gearing for "performance," this genuine Hero kit preserves your bike's balanced character, ensuring comfortable daily riding without compromising efficiency or adding stress to the engine.

What's in the Box

• Front Sprocket – 14 teeth (Part No. 23801-GF6-000), heat-treated steel with anti-rust coating
• Rear Sprocket – 42 teeth (Part No. 41201-KTC-900), SCM415 alloy steel with flame-hardened teeth, 61.4mm bolt circle
• Drive Chain – 428 pitch, 108 links (Part No. 40530-KCC-900), sealed rollers with rust-preventive oil coating
• Master Link – Spring clip or rivet-type master link for secure chain connection (included with chain)
• Installation Hardware – Washers, locknuts, or circlips as per original specification (if supplied by Hero with kit)

Installation & Maintenance Notes

Installation Tips:

• Professional installation recommended: While mechanically inclined riders can replace this kit with basic tools, proper sprocket alignment, chain tension, and master link installation are critical for safety and longevity. Under The Hood offers installation services for Varanasi-area customers.
• Inspect wear on other drivetrain parts: Before installing, check the chain slider, chain guide, and rear wheel hub for wear. Replace worn components to maximize the life of your new kit.
• Chain tension specification: Maintain 25-35mm vertical free play measured at the midpoint between sprockets with the bike on its center stand and in neutral.
• Master link orientation: Ensure the master link clip opening faces opposite the chain's direction of travel to prevent clip dislodgement.

Maintenance for Maximum Life:

• Lubrication interval: Clean and lubricate chain every 500-800 km or after rain/dusty riding. Use quality motorcycle chain cleaner followed by 428-compatible chain lube (available at Under The Hood).
• Tension checks: Inspect chain slack every 1,000 km. Adjust as needed to maintain 25-35mm free play. Uneven tension (tight spots) indicates worn sprockets or chain and requires replacement.
• Replacement indicators: Replace the entire kit when the chain has elongated beyond adjustment range, sprocket teeth show visible hooking/shark-fin profile, or you experience skipping under load.
• Riding habits that extend life: Avoid aggressive throttle inputs from standstill, maintain proper chain tension, and keep the chain clean and lubricated—expect 25,000-30,000 km lifespan with good care, 15,000-20,000 km under harsh conditions.

Safety Reminders:

• Never ride with excessive chain slack (risk of derailment) or over-tightened chain (damages gearbox bearings and rear wheel bearings)
• Check chain tension before long rides, especially when carrying pillion or luggage
• If you hear unusual drivetrain noise after installation, stop immediately and recheck installation

FAQs 

Q1: Is this kit compatible with my Hero Super Splendor BS6 model from 2022?
A: Yes, absolutely. The Hero 20K710S chain & sprocket kit is the standard OEM specification for all Super Splendor 125 models from 2005 to present, including all BS3, BS4, and BS6 variants (drum/disc brake, i3S, XTec). The drive system specifications have remained consistent across generations. Verify your bike is Super Splendor 125 (not Splendor Plus, Splendor iSmart, or other Splendor variants) for correct fitment.

Q2: How is this genuine Hero kit better than cheaper aftermarket chain sets available for ₹500-600?
A: Genuine Hero kits use premium SCM415 alloy steel with flame-hardened sprocket teeth and precision-manufactured chains that meet strict OEM tolerances. Aftermarket kits often use softer mild steel that wears faster, has inconsistent hardness, and develops tight spots or elongation within 8,000-12,000 km. Genuine Hero kits typically last 25,000-30,000 km with proper maintenance—nearly double the lifespan. The initial cost difference pays for itself through longer service life, better fuel efficiency (less friction), and fewer roadside adjustments.

Q3: Will installing this kit affect my bike's mileage or top speed?
A: No. This genuine Hero kit maintains the factory 14T/42T gear ratio that your Super Splendor was designed around. Your fuel economy (60-65 kmpl), acceleration characteristics, and comfortable cruising speeds (60-80 km/h) will remain exactly as Hero engineered them. In fact, if you're replacing a worn kit, you'll likely notice improved mileage and throttle response as power losses from a stretched chain and worn sprockets are eliminated.

Q4: Does this kit come with a warranty? What if I receive a defective part?
A: As a genuine Hero MotoCorp product purchased from an authorized source (Under The Hood), this kit is covered under Hero's standard spare parts warranty against manufacturing defects. If you receive a damaged or defective component, contact Under The Hood immediately with photos—we'll arrange replacement or refund as per Hero's warranty policy. We carefully inspect and pack all parts before shipping to minimize such issues.

Q5: Do I need to buy chain lube, cleaner, or any additional parts separately?
A: The kit includes all components needed for drivetrain replacement (sprockets, chain, master link). However, you'll need basic installation hardware if not reusing your old parts (axle nut, lock washer—typically reused). For maintenance, we strongly recommend purchasing motorcycle-specific chain cleaner and 428-grade chain lube separately (available at Under The Hood). You'll also need common tools: 17mm and 19mm spanners, chain breaker or master link pliers, and a torque wrench for proper installation.

Q6: How long will this kit last with normal city commuting and occasional highway rides?
A: With proper maintenance (regular cleaning and lubrication every 500-800 km, correct tension), expect 25,000-30,000 km from this genuine Hero kit under normal riding conditions (daily commute, pillion, moderate luggage). Harsh conditions (dusty environment, heavy loads, infrequent maintenance, aggressive riding) may reduce lifespan to 15,000-20,000 km. Replace when chain has elongated beyond adjustment or sprocket teeth show hooking. This is significantly longer than most aftermarket kits.

Q7: Can I install this kit myself, or should I visit a mechanic?
A: If you have basic mechanical skills and tools (spanners, chain breaker, circlip pliers), you can install this kit following your owner's manual. However, proper installation requires correct chain alignment, precise tension adjustment, secure master link installation, and torque specifications for critical fasteners. Incorrect installation can cause chain derailment or premature wear. For safety and warranty protection, we recommend professional installation—especially for first-time DIY mechanics. Under The Hood offers installation services for local Varanasi customers at competitive rates.