Does a High Comp Piston Require the use of Race Gas?

[yfz450le]

Just changed out the stock piston on my 2004 YFZ450LE for a 13.5:1. Really noticed a big difference in mid-top end, but seems like she bogs out alot on the bottom. Now, what I have done is I have a Titanium exhaust, K&N filter with lid re-moved, jetted, Quick shot accelerator pump cover and high performance CDI. I am running 92 octane pump gas but should I be running a 50/50 mix race/pump or full race gas. Any advice would be great.

 

[Ganz]

Not sure about the gas thing, but man that's a nice looking ride.

 

[yfz450le]

Thanks, for a 4 year old quad this thing still rides like it was new. Bearings are done twice a year and shocks are re-built twice as well. If ya keep on the maintenance they will lats forever. Here is a pic of my other ride...lol

 

[clutch]

At 13.5 to 1 you probably should be using a mix of race gas and the 92 octane. That is a lot of compression. With higher octane you would probably see an improvement in low rpm power. I would be worried about a hole in the piston on pump gas.

 

[Yamahax98]

yes u need to run race gas, it bumps you compression up and throw some hot cams in it to that will rilly turn her up

 

[yfz450le]

Thanks to all, really appreciate all the input. This site contains a wealth of knowledge.I was actually thinkin of the Hot Cams. Maybe try and find a cheap set on e-bay before the spring. Just out of curiosity are you talkin from experience ref the Cams or just from what you may have read or heard? Cheers, Eldon.

 

[Yamahax98]

before i did all the head work on my bike, all i had was hotcams compression piston and the thing ripped but i cant run the high compression piston with the head work because its decked and ill crash my valves but hot cams and high comp piston turn it up big time i no it for a fact.

 

[yfz450le]

Thanks again. I also have a spare head that has been ported and polished. All I need to do is swap out the valves from one to the other. Once again thanks thanks for all the input!

 

[Yamahax98]

is the head thats ported and polished decked at all ? if it is dont put a high compression piston and hot cams in it

 

[yfz450le]

The head is just ported polished. I dont think it has been shaved so it should'nt have any effect on the compression. What ya think you agree?

 

[kingston phazer]

yes i have a 2004 yfz with a 471 stroker kit with 13.5:1 use race gas other wise u will burn a hole in ur piston plus the extra power is amazing i can run with a rm250 bored to a 282 which is making 60-65 hp so definetly run race gas
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[kingston phazer]

anybody want mine gonna go back to 2 strokes like them better
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