KymcoForum.com

General => Technical | How To => Topic started by: stepheva on September 19, 2009, 03:22:18 AM

Title: Spark knock?
Post by: stepheva on September 19, 2009, 03:22:18 AM

Hey guys.  I've sorted out most of my other issues with the B&W150, but i'm still having one.  When accelerating, going up hills or riding 2 up, I get an annoying knocking sound from the motor.  My gut is thinking this is spark knock.  I have an NGKDP7EA9 in it right now, and I'm going to try running one plug colder and maybe upjetting.  Anyone else getting this knock on acceleration, etc?

Title: Re: Spark knock?
Post by: zombie on September 21, 2009, 12:26:36 AM

Premium fuel will help...some. Your on the right track w/ your cures. Lifting the jet needle 1 notch may also work. It's easy, and free...

Title: Re: Spark knock?
Post by: stepheva on September 22, 2009, 03:03:05 AM

Actually figured it out; crank bearings.