Yamaha 15hp four stroke

countryboy996

Seaman Apprentice
Joined
Jan 25, 2012
Messages
34
Good evening,

It is an 2005 and I have had it about a year. It has always ran rough at idle. It was cutting off at idle until it was rebuilt the first time. It continued to idle rough but wouldn't die. Had a shop rebuild it again and now a new carb. Still idles rough but great other than that. I have changed all fuel lines, new tank, filters, non ethanol gas. It's only a pull start check compression both cylinders are about 70psi.

2nd question is.. at only about 3/4 throttle there is a winding sound almost like a super charger. Nothing above or below that rpm range. Any ideas?
 
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