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Ive never seen an aftermarket head for a 4 stroke. You can have the stock one ported but there probably isnt too much to gain on a YFZ. There is also oversized valves available but that is pretty expensive and I dont know if the gains are worth it ...
If I was building a woods bike I would probably run a 98mm piston (470cc) with 12.5:1 compression to boost the low end ... also I would leave the cam timing stock .... it would have killer low end and have a strong mid/top. I think that is how a lot of the GNCC guys are running their bikes
If I was building a woods bike I would probably run a 98mm piston (470cc) with 12.5:1 compression to boost the low end ... also I would leave the cam timing stock .... it would have killer low end and have a strong mid/top. I think that is how a lot of the GNCC guys are running their bikes
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Web cams racing cams...
Ive seen quite a few guys porting heads on YFZ's with quite a bit to gain. Roughly 1-3 depending on the level.
You should definatly not run pump gas with a higher compression piston.
We run race gas 110 Octane in our bikes and have felt the gains and read them on paper also. Its just a win win situation with it. Its 100x cleaner and more consistant, Smells nice, burns cooler, and if you right the right place is not much more expensive than good pump gas(premium).
JMO....
Justin
You should definatly not run pump gas with a higher compression piston.
We run race gas 110 Octane in our bikes and have felt the gains and read them on paper also. Its just a win win situation with it. Its 100x cleaner and more consistant, Smells nice, burns cooler, and if you right the right place is not much more expensive than good pump gas(premium).
JMO....
Justin
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Web cams racing cams...
Originally posted by: yfzblaster1
Oh and as for the hot cam we installed one in my friends craptor and it wasent the greatest. But it was felt. I would go with a better quality brand. For instance Alba, whatnot
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Oh and as for the hot cam we installed one in my friends craptor and it wasent the greatest. But it was felt. I would go with a better quality brand. For instance Alba, whatnot
SEARCH!!!!