SYCARMS did you open the size of your crankcase vent tube because the blow by pressure is more on the 183 vs the 155. I think the gasket blew out from too much pressure and rpms with the 39t. I have a old valve cover that Im putting a bigger vent pipe in to reduce some crank case pressure. And going back to 31t rear and changing the 13/40 internal gears to 13/43 wich will be like a 33t rear sprocket by my calculations.
Just trying to get the top speed and take off more in the middle.
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