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1985 yamaha moto 4 not starting


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I have a 1985 moto 4 200 the rings aren't all that good and it has a knock but it ran great i left it outside in 20 degree weather for a couple of hours and it fired right up no problem and after a minute of it running it died as if i shut it off as if using the kill switch to kill it but i didn't and it has spark and compression and spraying carb cleaner in the cylinder didn't start it I am out of ideas any ideas of what it is?

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There should be dots on the timing gears to line up with the head. Make sure your at top dead center on the intake stroke with the piston. There should be a mark on the flywheel to line up as well. Take the timing chain adjuster and loosen it so your timing chain jumps teeth on the cams. Then roll your cams to spec.

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What are the marks on the piston.  Did you scrape it like that, is that a crack ? Maybe spray it with starting fluid to clean it up  Did the valve hit the piston ? 

After you clean it up with the starting fluid be sure to spray the cylinder head with WD-40 to lube it back up before you move the piston up and down.   

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