![]() ![]() Just that with optimization of stock valve gear will probably pay off better. Instead have porting done by someone who knows what they are doing. I thought it was very tractable.Ī hot cam in a standard head is probably a waste of money, plus with the high lift and stiff springs you'll see more wear on the cam and rockers. I had something similar to a 251-80 in mine, with a high compression piston, 40mm Dell'Orto and a pro-ported head. I think that was normally installed retarded a couple of degrees. ![]() IIRC many of the people racing 500 Yamahas with AFM in the day used a Megacycle 5160-2 (now 251-62) which was a variant of the 5160 that Jim Dour, owner/designer at Megacycle did for tuner Harry Lillie. ![]()
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