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OKay thanks. I figured out I had a blown crank seal so I replaced and everything was good. expect now I have either a really weak spark or no spark?!?I didn't touch the wiring and I used to have amazing spark. The only thing I did was hook up a battery to see if it did anything and it didnt.

narrower will make the turn radius worse. I mean narrower you will have a better turn radius. except at high speeds really wobble and hard to keep straight.

Okay will do. Its not a reed valve setup it using the piston as a vacuum. I mean piston valve setup

I have a 1987 Polaris trail boss 250. It has a brand new piston and bore but it only at 75psi compression????? And it will sometimes have suction to the carb so it will start then it will die and it wont have and suction to the carb and wont start..??? Im stuck here.