Royal Enfield 144040 Complete Engine Gasket Set (CAF) – Bullet 350 / Bullet 500 / Electra 4S–5S / Lightning CI Engines

The Royal Enfield 144040 Complete Engine Gasket Set (CAF Material) is the genuine overhaul kit designed for classic cast-iron (CI) Bullet engines. This OEM gasket kit is engineered to seal every critical joint in the engine, helping restore compression, prevent oil leaks, and maintain reliable performance on long rides.

Used on multiple legendary CI models like Bullet 350, Bullet 500, Electra 4S/5S, Machismo, Deluxe, Campus and Lightning 500/535, this kit is ideal when you’re doing a full engine rebuild, decarbonising, or major oil-leak rectification. The CAF (Compressed Asbestos-Free Fibre) material is built to handle heat, vibration and Indian riding conditions, giving you long-lasting sealing compared to cheap aftermarket paper gaskets.

Because this is a direct replacement for OE Part No. 144040, you get factory-correct shapes, bolt holes and thicknesses – which means less trimming, easier fitment, and reduced chances of rework or repeat leak jobs.

If you’re a workshop rebuilding vintage / pre-UCE Royal Enfields, or an enthusiast restoring a classic Bullet, this kit is a must-have engine overhaul pack that keeps the bike authentic, reliable, and ready for many more kilometres.

Note: This gasket set is only for cast-iron (CI) pre-UCE engines. It does not fit UCE or J-Series models.

Key Features

• Genuine Royal Enfield part no. 144040 – listed in official parts references as “GASKET SET COMPLETE / GASKET SET – ENGINE COMP CAF M”.

• Complete engine overhaul kit – includes all major gaskets needed during a full engine strip and rebuild (crankcase, cylinder base, head, timing cover, chaincase, etc.).

• CAF (Compressed Asbestos-Free Fibre) material – designed for high-temperature, oil-exposed joints, better durability than generic paper gaskets.

• Direct OE replacement – made to OE dimensions; no guesswork on shapes, port cut-outs or bolt patterns.

• Compatible with multiple CI models – Bullet 350, Bullet 500, Electra 4S/5S, Lightning 500/535, Machismo, Deluxe, Campus.

• Perfect for full rebuilds & decarbonising – ideal whenever crankcase is split or top-end is opened.

• Reduces oil leaks and seepage – proper sealing helps keep engine oil inside and dust/grime outside.

• Workshop-friendly packaging – all gaskets in one kit; saves time vs. sourcing individual pieces.

• Authentic restoration – keeps vintage Bullets closer to factory spec rather than mix-and-match aftermarket gaskets.

Compatibility Table 

❌ Not Compatible With (Explicit Exclusions):

• UCE engines (Classic 350/500 UCE, Thunderbird UCE, Standard/Bullet 350 UCE, Electra UCE).

• J-Series engines (Hunter 350, Classic 350 Reborn, Meteor 350, new Bullet 350 J-series).

• 650 Twins (Interceptor / Continental GT), Himalayan, Scram 411, Himalayan 450, Guerrilla 450, Super Meteor 650, Shotgun 650, Bear 650, Classic 650.

CHECK PART NUMBER BEFORE PURCHASE 

Variants

• Single Variant: Complete Engine Gasket Set – Royal Enfield OE Part No. 144040
  (No LH/RH / colour variants; one kit covers the full engine.)

FAQs 

Q1. Will this 144040 gasket kit fit my Classic 350 UCE or Electra UCE?
A. No. This kit is only for cast-iron (CI) pre-UCE engines (older Bullet, Electra, Lightning, etc.). It will not fit UCE or J-Series models. Always check your RC/engine number and parts book before ordering.

Q2. Is 144040 suitable for both Bullet 350 and Bullet 500 CI engines?
Yes. Trusted dealer sources list this gasket set for Bullet 350 as well as Bullet 500 and Lightning 500/535 CI engines, making it suitable for multiple classic models.

Q3. What’s the material – is it OEM quality?
This is a genuine Royal Enfield gasket set made from CAF (Compressed Asbestos-Free Fibre) and other OE-spec materials as per factory design. It’s a direct OE replacement for 144040, not a local copy.

Q4. When should I replace the complete gasket set instead of single gaskets?
Use a full kit whenever you:

• open the engine for overhaul / rebore / bearing replacement,

• split the crankcase, or

• have multiple oil leaks from different joints.
  This avoids mismatch of old and new gaskets and saves labour in the long run.

Q5. Do I need sealant with this kit?
Use sealant only where recommended in the Royal Enfield workshop manual (typically around crankcase joints and specific high-pressure oil areas). Do not overuse sealant; it can squeeze inside and block oil galleries.