EVOLUTION PIT BIKE 2 VALVES RACE HEAD FOR ZS155, GPX, YX160cc

This head cylinder kit improve hig end RPM performance and reliability

It includes:
- Complete GPX 02 head
- Titanium valve lightweight retainers
- Hard spring valves


Important Note: This kit does not contain a piston and camshaft.  This head works perfectly with stock YX/GPX camshaft, pistons or TB Parts pitston code TBW9028. It's avaliable black color, gray or gunmetal.

HIGH FLOW OIL LINE CYLINDER/HEAD YX150, YX160 & ZS155 GPX

STAGE 3 RACE HEAD
Compatible with engine: ZS155, GPX, YX, 1P60FMJ, 1P60FMK, etc.

Our "Stage 3 Race" head is a muscolarized version of classic ZS155 or YX chinese cylinder heads. This upgrade gives to your engine more power, torque and rpm.

OPTIMIZATION LIST
- Inlet and exhaust full gasflowing tuning
- CNC Head Cylinder basement leveling
- Combustion chamber geometry optimization
- re-alignment between valve guides and valve seats
- Valve seats and valve sealings optimization
- Lightweight and gasflowed valves
- Made in Italy single hard springs valve

N.B. HC 53mm dome head, camshaft not included.

150/155/160cc Race Head TB PARTS V2 Upgrade Kit:

- Race Head V2 - Roller rockers, 30mm intake valve, 24.5mm exhaust valve, 27mm intake port, 23mm exhaust port (valves installed).
- Race Camshaft V2-1 for Race Head V2 (we can switch to our V2-2 if preferred, just email after your order is placed and request the change)

This kit is for stock YX/GPX 150/160 engines and only includes our new Race Head V2 and camshaft (see Important Note below). While the new head may appear to be the same on the outside as our other KLX110 type race head, internally it has gone through numerous changes.  The addition of roller rocker arms and a new camshaft are the biggest changes followed by bigger valves and ports. The exhaust valve is now stainless as well (21-4N material).  This all adds up to a cylinder head that puts out a professional level of performance yet is still affordable for the privateer rider.  These are high quality parts and require no machining to the cases or other modifications - bolt on and go!

Important Note: This kit does not contain a piston.  This head will not work with stock YX/GPX pistons.  We recommend getting the TBW9028 kit in this section that includes the piston and a gasket kit.  If you don't use one of our newly modified pistons, check your your clearances very carefully and modify your piston's reliefs to clear the bigger valves, if need be.

There are no installation instructions, but if you can replace your piston, you can install this kit. If you don't have any experience working on your engine, we highly recommend having a professional technician install this kit. The parts are installed in the same manner as OEM parts.

62mm BIG BORE KIT FOR YX150, 160 AND ZS155