Speed Kit; GX340 to GX390, 420 Predator, & 13/15hp OHV; Stage 2
Stage 2 Speed Kit for GX340-GX390, 420 Predator, and 13/15hp (440-460cc) OHV Engines
As a step up from the Stage 1, this kit is designed to improve the power and durability of GX340s and GX390s.
Includes:
- Race/Open Air Filter & Adapter
- 23.5mm (Bored) Honda Race Carb
- Heavy Duty Valve Springs
- Offset Timing Key
- Twister Camshaft
- Carb and Side Cover (7-Bolt) Gaskets
- Additional main jet for optional tuning
- Optional Header/Exhaust
- Optional Aluminum Flywheel
*Note: Use of the choke bracket requires use of a stock Honda (or Chines OHV) "Air Filter-to-Carb" gasket. This is not included in the kit. You can use the one that came with the motor.
UT2 series Hondas (2012 & up) or 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, and 6693 Billet flywheel.
If using another billet flywheel, you must run a UT1 style coil (single wire).
13/15 Chinese Engines (414, 420, 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.
13/15 Chinese Engines (414, 420, 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.
Header sold separately.
Filter should be sprayed with a K&N type oil, especially for dirt applications. Oil not included
Picture is for reference only and may show optional parts. See above description for actual content.
Warning: Billet aluminum flywheel recommended. Stock flywheels, especially "clones" are prone to failure and are very dangerous!
