i have herd from more than one it eats up starters. one guy on here even can up with an idea of useing a chain saw compresion release machined into his head to over come the problem. also herd they blow head gaskets?
I changed my mined...franz said a big bore kit without any top-end work would be like throwing my money out a window. Franz said to get a high compression piston and use race fuel, so I got a 12:1 JE piston
Remember,the thing that holds the horsepower down the most on this motor is the two-valve head.So,whatever you decide to do,have some headwork done. Port,polish,bigger valves,etc.If you leave the head stock, it is only gonna flow a certain amount no matter what else you do to the motor because it has to flow thru the restricted head.Scott.
question for you fellas...I am removing the cylinder head and attempting to ensure TDC. I am setting the "I" mark on the pickup coil rotor with the stationary point on the crank case cover. When looking at the camshaft sprocket it's "I" mark is off by 180...could Yamaha have assembled it this way? I have rotated it a full cycle to check and it ends up the same. Ideas?