V2 heads

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sean01

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yeah im guessing due to the bigger valves the piston needs bigger valve reliefs.
i just bought a complete yx 160 with v2 roller head and big bore kit fitted, its blown up with a massive hole in the piston and a bent conrod.

im guessing the big bore kit piston wasnt compatible with the head and it broke the exhaust valve off and destroyed everything in its path
 

mboyg1

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yeah im guessing due to the bigger valves the piston needs bigger valve reliefs.
i just bought a complete yx 160 with v2 roller head and big bore kit fitted, its blown up with a massive hole in the piston and a bent conrod.

im guessing the big bore kit piston wasnt compatible with the head and it broke the exhaust valve off and destroyed everything in its path
haha, that would have been good pick up
 

ClassicHonda50

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Hi

From the TB Parts Info:

The V2 head will not work with the 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 clearances very carefully and modify your piston's reliefs to clear the bigger valves, if need be.

Cheers

Jaimie
 
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