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Hop Up Kit, GX390 & 13/15hp OHV, Stage 3
Hop Up Kit, GX390 & 13/15hp OHV, Stage 3

Our Price: $382.00

Stock Status:In Stock

Part #: STAGE3KIT390

Select Flywheel

No Flywheel
Add Aluminum Flywheel - Recoil Start [+$166]
Add Aluminum Flywheel - Electric Start [+$211]
Ignition Coil Option

Add UT2 Coil without Rev Limiter, for UT2 Hondas Only [+$66]
Add Genuine Honda UT1 Coil [+$36]
None Included
Header & Exhaust Options

No Exhaust
Add Header- Kart & Mini Bike [+$41]
Add Mud Motor Header & Muffler (GX390) [+$46]

Description -
Stage 3 Hop Up Kit for GX390 and 13/15HP OHV
A step up from our Stage 2 kit, this is designed to wake up GX390s, allowing 20+ HP!

Kit Includes:
  • Race/Open Air Filter & Adapter
  • Heavy Duty Valve Springs
  • Offset Timing Key
  • 280 Lift Camshaft
  • Reinforced Rocker Arms
  • Billet Rod (+.040 Longer)
  • Carb and Side Cover Gaskets
  • Optional Header/Exhaust
  • Optional Aluminum Flywheel

Use of the choke bracket requires a stock Honda (or Chinese OHV) "air filter-to-carb gasket". This is not included in the kit. You can use the one that came with the motor, or you may purchase one here.

Billet aluminum flywheel recommended. Stock flywheels, especially "clones", are prone to failure and are very dangerous.

UT2 series Hondas (2012 & up) and later have a built-in rev limiter in the coil and will require a new coil to exceed 4000rpm. The UT2 coils (4 wire) can only be used with stock flywheels. If using a billet flywheel, you must run a UT1 style coil (single wire). 13/15 Chinese engines (414, 420, and 460) usually have UT1 style coils already. However, some Lifans and 420s have a digital ignition and will need a Honda UT1 coil to run the billet flywheel.

Picture is for reference only and may show optional parts. See above description for actual content.

Filter should be sprayed with K&N type oil, especially for dirt applications. Oil not included - click here.

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