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Old 08-11-2013
Junior Member
Join Date: Aug 2013
Posts: 1
Default Cyl 1 running lean

I have a 115 yamaha 2 stroke, has lost some power. Only able to get around 4900 rpms, used to top out around 5500.I pulled the plugs and noticed cyl 1 white, not burning good. It's not wet like not firing. I have 140 compression all cyls at wot, spark on all cyls, replaced all plugs, both fuel filters, fuel line from primary filter to engine filter. Took carbs apart and checked idle and main jets, all clear. Motor does not seam to be running as smoth as it used to, could a bad reed valve cause just one cyl to run leaner than the rest.
Thanks for any help you can give
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