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hi im new to this racing fuel stuff i was wondering if it is safe to run 50/50 92 pump gas and vp c12 108 octane to get 100 octane gas for an 08yz450f also would this make the knocking go away?

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i dunno..but many are having difficulty with ethanol blended gasoline...best advise i can see is try it and watch your spark plug carefully...many are reporting good results with marine gas..you may wish to hit up your local marine store for a gallon and see what happens....mow another thing and this is sure to raise hell all over the forum is your brand of pre mix.....i use yamalube "R" and golden spectro....may switch oils and just experiment..like i said though any thread on best oil will raise hell along with that speshul race type air we use in our sneakers..good luck..god speed

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he has a 4 stroke....try to find some 93 octane non-ethanol, they sell it at a couple stations in Ga, I assume in Pa it is the same. if not, yeah 50/50 mix and race should be the ticket

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If your bike is not modified, it should run fine on fresh pump premium. If the gas is fresh and the motor stock, any "knocking" is a symptom of some other problem.

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If your bike is not modified, it should run fine on fresh pump premium. If the gas is fresh and the motor stock, any "knocking" is a symptom of some other problem.

+1! You are wasting your money on race gas for a stock YZ450F. I run ethanol free pump premium but fresh pump premium with 10% ethanol is fine.

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like others have said, its a waste of money. if there's a nocking, i would be more worried about something else, but if you narrowed it down to your fuel i would start adding seafoam to your gas as it is a fuel stabilizer and it cleans your whole fuel system and cleans carbon build up in the motor..

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ok but one other question why do they say run 95 or up octane?

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At sea level 95 octane is fine in 4-stroke thumpers. But as you go to higher elevations, the number can go down. Using 93, let alone 95 at 4000 ft is useless. As a matter of fact, you can't even buy 95 above 3000 ft. Theres not enough oxygen in the air to use all that octane. I live a 5000 ft, 91 is the best and most useful up here.

As for ethanol, many dispute it's bad qualities. When I'm racing in Mexico I add ethanol (about 1 oz to a 3.5g tank), but thats usually because I don't trust where the gas is coming from and the EtOH will mix the water and let the engine pass it.

I have never had problems with ethanol-added fuels.

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ok but one other question why do they say run 95 or up octane?

Yamaha is probably quoting RON octane ratings, and a pump is an average between RON and MON numbers. 95 RON should be close to 91 pump fuel.

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