Hop Up Kit - GX340 - GX390
Basic kit for improving the performance of GX340, GX390s, and Chinese OHVs. Simple to install, you can expect significant performance increases.
Stage 1 Kit includes
Race/Open Air Filter & Adapter,
HD Valve Springs
Offset Timing Key,
Honda Jet for application,
Choke Hold Down Bracket
Optional Header/Exhaust
Optional Carbs (includes insulators)
Picture for reference only and may show optional parts. See above description for actual content.
Header not included unless specified.
Aluminum or Honda flywheel recommended. Stock flywheels are prone to failure and very DANGEROUS Note: UT2s series Hondas (2012 & up) or later have a built in Rev Limiter in the coil and will require a new coil to exceed 4000 rpm.
Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp Chinese OHV, Stage 2 / 3
As step up from the Stage 1, this kit is designed to improve the power for the GX340s and GX390s along with improving the durability.
Includes
Race/Open Air Filter & Adapter
Choice of Carbs
HD Valve Springs
Offset Timing Key
280 Lift Cam
Reinforced Rockers
Billet Rod +(.040 longer)
Carb and Side Cover Gaskets
Optional Header/Exhaust
Optional Aluminum Flywheel
Picture for reference only and may show optional parts. See above description for actual content.
Header not included unless specified.
Note: Use of the Choke Bracket requires use of 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.
Aluminum or Honda flywheel recommended. Stock flywheels are prone to failure and very DANGEROUS
Note: UT2s series Hondas (2012 & up) or later have a built in Rev Limiter in the coil and will require a new coil to exceed 4000 rpm.
Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp Chinese OHV, Stage 4
The 3 kit starts with package similar to that of the stage 2 kit but adds a Ported and Milled Head with stainless, stainless valves, stud kit, & HD valve train components.
Includes
Race/Open Air Filter & Adapter,
Choice of Carbs
Choice of Cams
Ported Head, Milled .100" (Chinese OHV)
Stainless valves
Aluminum Retainers & Split Keepers
Chrome Moly Pushrods
Single or Dual Springs
8 degree Timing Key,
Billet Rod +(.040 longer)
Carb, Head, & Case gaskets
Stud Kit
Roller Tip 1.2 Rocker Arms (Optional Aluminum Roller Rockers)
Optional Header/Exhaust
Optional Aluminum Flywheel
Picture for reference only and may show optional parts. See above description for actual content.
Header not included unless specified.
Due to head work required, allow 1 week to ship.
Note: Use of the Choke Bracket requires use of 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.
Aluminum or Honda flywheel recommended. Stock flywheels are prone to failure and very DANGEROUS
Note: UT2s series Hondas (2012 & up) or later have a built in Rev Limiter in the coil and will require a new coil to exceed 4000 rpm