Bring your 650 Twin’s front end back to factory spec with the genuine Royal Enfield Fork Main Spring — Part No. 148331(A). This listing ships as a pair (2 pieces)—one spring for each fork leg—so preload and rider sag are perfectly balanced. Catalogued by RE as “FORK, MAIN SPRING,” these coils match the OE wire gauge, free length, pitch and ground ends to work seamlessly with the stock damper stack, spring top spacer (148330) and top-out spring (148333).
If your bike dives under braking, sits low after years of use, or feels vague mid-corner, a fresh OE pair restores stock ride height, neutral steering and high-speed stability—without trial-and-error rates. Designed for Indian/EU conditions, the springs offer quiet operation and long service life. Only confirmed models are listed to keep returns at zero.

Key Features

• Ships as a set (2 pcs) — covers both fork legs

• Genuine OE Royal Enfield 148331 / 148331(A) — “FORK, MAIN SPRING”

• Returns factory sag, ride height & geometry; reduces brake dive/wallow

• Works with OE stack: 148330 spacer & 148333 top-out spring

• Correct coil pitch & ground ends for smooth action, no coil bind

• Direct drop-in; no trimming or shimming required

• Durable finish and consistent rate for long service life

• Ideal for service/restoration of Interceptor 650 / Continental GT 650

Compatibility Table 

Exclusions: Not listed for Super Meteor 650 / Shotgun 650. Order only where your VIN fiche shows 148331.

Variants

• 148331(A) — Fork Main Spring (Pair / Set of 2) (this product)

• Related OE parts (order by VIN): 148330 Spring Top Spacer, 148333 Top-Out Spring, fork oil seals & dust seals.

FAQs 

1) Will these fork springs fit my Interceptor 650 BS6 / Euro 5?
Yes—this 148331(A) fork main spring pair is confirmed for Interceptor 650 and Continental GT 650 across Euro 4/Euro 5.

2) What ride improvement should I expect after installing 148331 springs?
Restored OEM sag & preload, less brake dive, steadier cornering and true factory geometry for highway and twisty riding.

3) Are these stiffer than aftermarket performance springs?
No—148331 is the stock rate. Choose these for original feel; use performance springs only if you want a firmer setup.

4) Do I need other parts when replacing fork springs?
Not required.

5) Will these change seat height or steering?
They return the bike to factory ride height and neutral steering, correcting low sag from tired springs.

6) How many springs come in the package?
A pair (2 pcs)—one for each fork leg. Buying the set prevents left/right mismatch.