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Predator 420 Stage 1 Performance Kit, fits GX340/GX390, 420cc Predators
shown for reference only: $129.95
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Product Options
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Engine Type*
Race/Open Air Filter Adapter*
Exhaust*
Camshaft*
Stage 1 Kit
GX340/390/420 Predator

Basic kit for improving the performance of GX390s, 420 Predators. Simple to
install, you can expect significant performance increases.
INCLUDED:
- Race/Open Air Filter & Adapter
- HD Valve Springs
- Offset Timing Key
- Main Jet for application (see Notes)
- Pilot Jet
- Choke Hold Down Bracket
Optional
- Exhaust Header (Optional)
- Camshaft (Optional)
Picture for reference only and may show optional parts. See above description
for actual content. Header not included unless specified.
Filter should be sprayed with K&N type oil, especially in dirt applications. Oil
not included click here
Billet Aluminum flywheel recommended. Stock flywheels, esp "Clone" are prone to
failure and very DANGEROUS
Note: UT2s series Hondas (2012 & up) have Rev Limited coils and will require a
new coil to exceed 4000 rpm. The UT2 coils (4 wire) can only be used with stock
flywheels or 6693 ARC flywheels. If using any other Flywheels, you must run a
UT1 style coil (single wire). Most 390 “clone”, 420s, and 460s have UT1 style
coils already (However some Lifans and 420s have a rev-limited digital ignition)
The difference in the Kits is the main jet. We recommend you check the check
your STOCK main . If stock main is a :
· #92 thru 97, use a UT1 kit,
· #98 thru #102 use a Hemi Kit’
· >102, Use a UT2 kit
Manufacturers have been know to use different jets on the same models. So it is
important to know the stock jet size
Basic kit for improving the performance of GX390s, 420 Predators, 13/15 hp Chinese OHVs. Simple to install, you can expect significant performance increases.
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Basic kit for improving the performance of GX390s, 420 Predators, 13/15 hp Chinese OHVs. Simple to install, you can expect significant performance increases.
new
2-lbs
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Red/Black/Blue
NR-STAGE1KIT390
GTC Industries
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