0007 Posted July 20, 2011 Report Share Posted July 20, 2011 My 07 Beta 270 has quite a detonation at medium high RPM and moderate throttle opening, after a long climb it gets a lean lopey idle Have richened the needle and gone through the carb Anyone have any tips? Quote Link to comment Share on other sites More sharing options...
nzralphy Posted July 20, 2011 Report Share Posted July 20, 2011 Use fresh hi octane gas every time. Polish the top of the piston and the cylinder head. It helped when i had a 270, but it never fully went away. Quote Link to comment Share on other sites More sharing options...
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