sure you can go for ages and not crack a cylinder , some people drive for years with no insurance and never have a car crash
I will not port a cylinder for some one with out a girdle head, the reason being by the time you machine the head and put another head gasket your halfway there anyway
Replace the exciter coil
Its getting hot and shorting out , this reduces the amount of current to run the igniton and so it misfires etc
When it cools down the short goes away and the ski runs again until the coil heats up comprimising the insulator in it
This is a extremely common yamaha...
If you still have the stock restrictors in the carbs and not a jet in the return like then you will have next to know pressure in the return line either
Why are you looking is it for interest or do you have an issue
Has anyone looked at the crank and noticed how it looks like an oem crank
Im not sure where that 11mm of stroke went but i cant see any machining that actually accomidates it
And when you consider what the timing would actually be on an oem cylinder with a 11mm stroker on a stock cylinder.
I...
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