Yamaha 115 idle tuning

[slow530]

I have a '97 Yammie 115 2 stroke that generally runs well. The only adjustment on the carbs is the pilot air screw with a nominal setting of 1.5 turns out from bottom. Is there a way to tune the idle setting other than by ear? There must be a way to dial the mixture in to the optimum setting. A sniffer, an analyzer? Any thoughts on this?

 

[rowboater]

Re: Yamaha 115 idle tuning

I have the exact same motor.Only other fine tuning I know of on the adjustment is too "tirm' the adj. screw when idling on the water.

 

[Ray Neudecker]

Re: Yamaha 115 idle tuning

Check the idle timing, too high or low will cause idling problems.

 

[slow530]

Re: Yamaha 115 idle tuning

Good call!!
Idle timing screw was loose. Added a lock nut and reset to the mark on the flywheel. Idles nice now. Will confirm with test run later this week. Thanks - Scott

 

[Ray Neudecker]

Re: Yamaha 115 idle tuning

You are welcome.That is not an uncommon problem. Good Luck.