Question about 2008 Yamaha yZ250F
Assuming it all back together correctly as you had so much practice now I sure all your timing set correct and your valves clearance are all spot on
There is a few things I would be attempting firstly being its virtually brand new motor I would be checking your stator with multimeter testing its resistance readings - let me know if you want info on this ?
if the stator all good then I would be suspicious of the CDI unit especially as you have cooked motor beneath it the heat could have killed it ?
if these two theory fail then your next option would have to be leak down test to confirm your new head is sealing valves in it are sealing and you not losing compression past the rings
From what you have written I would be mostly concerned with electrical side first Dont be fooled either just because spark plug has a spark does not mean stator and CDI are correct?
have you tested kicking over with spark plug laying on head bolt or something is it sparking at all?
Posted on Sep 13, 2011
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Posted on Jan 02, 2017
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