Genuine Royal Enfield Piston Ring Set +0.020" O/S (3-Ring Set) for Bullet 350 / Electra 4S–5S / Machismo / Campus | 112053

Rebuilding a smoky or low-compression Royal Enfield 350 top-end after a rebore requires the correct oversize rings—not STD. Royal Enfield Part No. 112053 is listed as “PISTON RING SET 020''”, i.e., +0.020" oversize ring set, supplied as a 3-ring set for legacy 350cc Bullet-family engines. 

Choose this when your cylinder has been rebored to 0.020" O/S and you need proper sealing to restore compression, starting, and power while controlling oil consumption. Correct ring sizing is critical for ring end-gap, heat transfer, and cylinder life—generic rings often lead to poor bedding-in, repeat smoke, or uneven wear. 

Fitment is restricted to the models confirmed by dealer sources below. Before ordering, verify your rebore size (invoice from machinist or bore measurement). If your engine is still STD, use the STD ring set instead (different part number). This listing is written to reduce wrong orders and returns by clearly stating oversize and confirmed applications. 

Key Features 

• Genuine Royal Enfield ring set (OEM-spec) 

• Part Number: 112053

• Listed description: “PISTON RING SET 020''” = +0.020" oversize 

• Commonly supplied as set of 3 piston rings 

• Designed for legacy 350cc Bullet-family engines (confirmed models below)

• Helps restore compression and reduce smoke/oil burning after a rebore

• Better dimensional consistency vs many aftermarket “universal” ring sets

• Recommended: check ring end-gap and cylinder finish (hone) before assembly

Compatibility Table

Explicit exclusions (to prevent wrong orders): UCE Classic/Bullet/Thunderbird, J-Series (Classic Reborn/Hunter/Meteor/Bullet J), 650 Twins, Himalayan/Scram—unless you have microfiche/VIN proof for your exact platform.

Variants

• Only one variant here: +0.020" O/S – Part No. 112053 
  (If you also sell STD or +0.040", keep separate listings to avoid returns; competitors often mix sizes.) 

FAQs 

Q1. What does “020'' / +0.020 O/S” mean?
It means the rings are for a cylinder rebored 0.020 inch oversize. This is not STD. 

Q2. How many rings are included in 112053?
Dealer listings commonly specify this as a set of 3 piston rings for the legacy 350 engine family. 

Q3. Will it fit Classic 350 UCE or Classic 350 Reborn (J-Series)?
Not confirmed. This part number is listed for legacy Bullet/Electra/Machismo/Campus 350 family applications only. 

Q4. My bike is smoking—should I buy this?
Only if your cylinder is already rebored to +0.020". If your bore is STD or a different oversize, you need the matching ring size. 

Q5. What should I replace along with rings?
Best practice: top-end gasket set, inspect piston condition, hone cylinder, and verify ring end-gap before final assembly.