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Dirt Bike Brands - Other
WR/YZ 426F Weirdness...Help?
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[QUOTE="Rich Rohrich, post: 109769, member: 16241"] I was happiest with my 420 (94mm bore) at .037" squish. At 800ft elevation and ~13.6:1 mine would run without knocking on pump fuel (93 octane MTBE Amoco) plus 2.5 ounces/gallon (about 1%) of C12 , or some equivalent octane booster. I only ran it that way for a short while because ALL YZFs and WRs run much better with proper race fuel run at 100% . The complete 97mm Wiseco assembly weighs a total of 397 grams, which is 48 grams more than the 94mm assembly and 54 grams more than the OEM 92mm assembly so I'll be starting off at .045" squish with the 97mm to allow for any additional rod stretch that may occur, with the intention of dropping it below .040" if it looks to be safe. I don't know what the OEM 95mm assembly weighs so I might be acting overly cautious in this case. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
WR/YZ 426F Weirdness...Help?
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