Rolon HPORC 389 Brass O-Ring Chain & Sprocket Kit for Royal Enfield Meteor 350 / Classic 350 Reborn / Hunter 350 – 15T/42T, 520, 104L – HPORC 389

Rolon’s HPORC 389 is a premium brass-plated, O-Ring sealed chain + sprocket kit built for the Royal Enfield 350 J-platform drivetrain.
Stock-spec 15T/42T with 104 links (520 pitch) for smooth pickup, reduced chain slap, and better rust resistance when maintained right.
Sold by Under The Hood (underthehood.co.in) with fitment support and careful packing.

If your bike has started feeling jerky on throttle, making khat-khat / chain slap noises, or the rear sprocket teeth are hooked and the chain keeps needing adjustment, it’s time to replace the full kit—chain + both sprockets together.

Rolon HPORC 389 is positioned as a premium replacement/upgrade for Royal Enfield’s J-platform 350 motorcycles using the common 15T front / 42T rear ratio and 104-link, 520 pitch chain length. The O-Ring sealing helps retain lubrication inside the chain’s working areas—typically translating to smoother running and lower wear versus open chains when you ride in dust, rain, or do frequent highway runs.

The “C” kit is widely sold/positioned as brass plated (inner + outer plates), which riders prefer for better corrosion resistance and an OEM-plus look—useful for all-weather commuting and touring.

Why buy from Under The Hood: you get an enthusiast store that understands pitch/links/teeth, plus support to avoid the most common mismatch—rear hub pattern + front sprocket spline checks before ordering.

KEY FEATURES & BENEFITS 

• Genuine Rolon kit: HPORC 389 (Rolon Chain + Front + Rear sprocket)

• Stock gearing (direct replacement): 15T front / 42T rear for J-platform 350 drivetrains

• 520 pitch, 104 links: common J-platform length; clean fit when installed correctly

• O-Ring sealed chain: helps reduce wear and improves smoothness when maintained

• Brass-plated plates (seller/kit positioning): improved rust resistance + premium finish

• Better NVH when fresh: less chain lash/“khat-khat” compared to worn kit (with correct slack)

• Bolt-on replacement for the listed models—no gearing experiment here (stock ratio)

• Rear sprocket commonly listed as 6-hole pattern in retailer specs

• Clear component IDs available on some listings (helps cross-check before purchase)

• Works best when paired with proper chain cleaning + lubrication intervals

TECHNICAL SPECIFICATIONS

COMPATIBILITY SECTION

a) Confirmed Compatible Models

*Years are only stated where explicitly reflected in available listing/naming.

Not Compatible / Common Confusion

• Does NOT fit UCE Classic 350 / Classic 500 (older platform) chain kits—those typically run different sprocket sets/pitch and are not “J-platform 350” kits. (Most confusion happens when someone searches “Classic 350 chain kit” without specifying Reborn/J-Series.)

• Not meant for 650 Twins / Himalayan / Scram / X440/Mavrick 440 / KTM applications (different pitch/ratios/hub patterns).

Who should choose what:

• City + budget: HPOR (standard O-Ring)

• All-weather / coastal / touring: HPORC 389 brass-plated (less cosmetic rust, premium look)

WHAT’S IN THE BOX

• 1 x Front Sprocket – 15T

• 1 x Rear Sprocket – 42T

• 1 x Rolon Chain – 520 pitch, 104 links, O-Ring

• Master link: — not clearly specified in available Rolon/retailer data (some chains ship with link; confirm at dispatch)

Not included (typical): rear hub dampers/cush rubbers, sprocket bolts, wheel bearings.

INSTALLATION & MAINTENANCE NOTES

• Install at a professional workshop; ensure wheel alignment and correct torqueing.

• Always replace chain + both sprockets together (don’t mix new chain with old sprockets).

• Before dismantling, confirm:

  • Front sprocket spline type

  • Rear sprocket mounting pattern (some listings mention “Flower Type Window”)

• Set chain slack strictly as per your Royal Enfield owner’s manual.

• Chain care (practical):

  • Clean with a chain cleaner/kerosene (as recommended by resellers)

  • Lube every ~450–800 km (more often in rain/dust).

  • Avoid direct high-pressure water at the chain.

• Re-check slack after 200–300 km once the kit beds in.

FAQ

Q1) Will HPORC 389 fit my Meteor 350 / Classic 350 Reborn / Hunter 350?
Yes—HPORC 389 is consistently listed for these models with 15T/42T, 520, 104 links. Still, if your bike has a wheel/hub swap, confirm the rear mounting style before ordering.

Q2) Is this stock replacement or a gearing change?
This kit is sold as a stock-spec ratio (15/42) for the 350 J-platform setups—meant to restore smoothness, not change top speed/acceleration behavior.

Q3) Is it really brass, or just gold-colored?
Retailers describe it as brass plated (including inner/outer plates). We do not recommend assuming plating beyond what’s stated in listings—if you want, ask us for pack photos before dispatch.

Q4) Does an O-Ring chain reduce noise and jerks?
A fresh, correctly installed kit typically reduces chain lash and “khat-khat” compared to a worn chain/sprocket set. Noise can return if slack or alignment is off.

Q5) How long will this kit last?
Life depends heavily on cleaning, lubrication frequency, load (pillion/luggage), and riding environment. O-Ring chains generally reward good maintenance better than open chains.

Q6) Should I change cush rubbers (rear hub dampers) as well?
If you feel excess driveline lash even after new chain/sprockets, old cush rubbers can be a factor. They are not included with this kit.

Q7) Can I install it at home?
Not recommended unless you have the right tools and experience (alignment + torque + slack setting matters). Incorrect installation can damage the new kit quickly.

Q8) What’s the chain pitch and link count for this kit?
520 pitch, 104 links—104 is also referenced as a standard length for the 350 J platform in other chain references.