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UNDER THE HOOD

Main Shaft (4-Speed Gearbox) for Royal Enfield Bullet 350/500, Electra 4S, Machismo, Lightning | 111165/18 | Genuine OEM

Main Shaft (4-Speed Gearbox) for Royal Enfield Bullet 350/500, Electra 4S, Machismo, Lightning | 111165/18 | Genuine OEM

Rs. 820.00
Rs. 830.00 Rs. 820.00
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Important Order Policy
Please order only after confirming the part number, model, variant, year, side, connector type and compatibility. All orders are non-cancellable once placed. Correctly shipped spare parts are not eligible for return, exchange or refund due to wrong selection, wrong diagnosis, fitment mismatch, mechanic recommendation or change of mind. Electrical/electronic items are additionally non-returnable once opened, installed, plugged in, tested or used. Wrong item, damaged item or missing item claims require a complete unboxing video within 24 hours. Read full Return & Warranty Policy

Royal Enfield 111165/18 is the Main Shaft for the 4-speed gearbox used on Royal Enfield Retired/Old-Model platforms. In the official retired-model parts catalogue, it is listed as “Main shaft” under Gear Case & Gears – 4 Speed, and commonly referenced by sellers as “MAIN SHAFT 4SPEED.” 

This is a high-impact internal transmission part: if your bike has symptoms like gear jumping, abnormal gearbox noise, excessive play, worn splines, rough shifting, or you’re doing a 4-speed gearbox rebuild, replacing the main shaft with a correct-spec part is essential for reliability and safety.

Many aftermarket shafts are sold as “fits 4 speed,” but machining tolerances and heat treatment vary—leading to premature bearing/spline wear. 111165/18 is the OEM-referenced part number, designed to match factory geometry for correct gear mesh and long service life. 

Fitment note (return-reducer): This part is for 4-speed models. Several sellers explicitly state it fits all 4-speed models except Thunderbird, so do not order for Thunderbird / 5-speed applications unless you have confirmed a 4-speed gearbox build. 

Key Features 

  • Genuine Royal Enfield part reference: 111165/18 (Main Shaft – 4 Speed) 

  • Listed in official Retired Models catalogue under Gear Case & Gears – 4 Speed 

  • Used for 4-speed gearbox rebuilds: restores proper gear alignment and shifting feel

  • Helps address gear noise/jump caused by worn shaft splines or excessive shaft play

  • Engineered for correct fit with the 4-speed gearset and bearing stack-up 

  • Quantity: 1 piece (as sold by major dealers) 

  • Not a cosmetic part (no black/chrome variants; internal gearbox component)

  • Strong return control: clearly positioned for 4-speed applications only

Compatibility Table 

PLEASE CHECK PART NUMBER BEFORE PURCHASE 

Model (Confirmed by dealer fitment lists) Platform / Engine Family Gearbox Reference years shown by sellers Notes
Bullet 350 (Retired/Old Models) Pre-UCE “Retired Models” 4-Speed “1955” (seller ref)  4-speed only
Deluxe Retired Models 4-Speed “1986” (seller ref)  4-speed only
Machismo Retired Models 4-Speed “1989” (seller ref)  4-speed only
Campus Retired Models 4-Speed “1997” (seller ref)  4-speed only
Electra 4S – KS / ES Retired Models 4-Speed “2005” (seller ref)  Electra 4S only
Bullet 500 Retired Models 4-Speed “2000” (seller ref)  4-speed only
Lightning 500 Retired Models 4-Speed “2000” (seller ref)  4-speed only
Lightning 535 / 535 ES Retired Models 4-Speed “2001” (seller ref)  4-speed only
Machismo A350 Retired Models 4-Speed “1999” (seller ref)  4-speed only

Explicit Exclusions

  • Thunderbird models (multiple sellers explicitly exclude Thunderbird for 4-speed mainshaft fitment) 

  • Any UCE (Classic UCE / Bullet UCE / Thunderbird UCE), J-Series 350, 650 Twins, Himalayan/Scram (different gearbox family)

Variants

  • No variants (single main shaft).

FAQs

Q1. What exactly is 111165/18?
It is the Main Shaft for the 4-speed gearbox, listed in the official retired-model catalogue in the “Gear Case & Gears – 4 Speed” group. 

Q2. Will this fit Thunderbird / 5-speed Electra?
Typically no—at least one major seller states it fits all 4-speed models except Thunderbird. Treat Thunderbird/5-speed as not compatible unless you confirm a 4-speed gearbox. 

Q3. My gearbox is noisy / jumps gear—will changing the main shaft fix it?
It can, if the noise/jump is from worn splines, shaft play, or bearing seat wear. A full inspection of bearings, gears, forks, and bushes is recommended during rebuild (standard gearbox practice). 

Q4. Is 111165/18 genuine OEM?
Bike-Parts-RoyalEnfield lists 111165/18 as a genuine Royal Enfield part (“MAIN SHAFT 4SPEED”). 

Q5. Do I need to share my bike details before ordering?
Recommended. Share model name + gearbox type (4-speed/5-speed) to avoid wrong ordering.

Verify Fitment on Official Brand Portals

For selected genuine spare parts, you can cross-check the part number on the official brand portals before ordering.

Royal Enfield Official Spares Portal

Hero MotoCorp Official eCatalogue

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