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Message started by stewmills on 09/24/12 at 19:14:06

Title: Plug Diagnosis
Post by stewmills on 09/24/12 at 19:14:06

OK...I need some basic advice on what this plug means. I have a stock bike with the stage 1 kit. It was not purring like I wanted so I shaved the white spacer down 1/3 tonight (did 2/3 before the stage 1 kit and put a new one back in with the stage 1 kit to start over and take one adjustment at a time...) and that seemed to help, but will know for sure when I ride more tomorrow as I completed the T6 conversion tonight also and need to give it a good whirl...

Anyhow, while I was in the top shaving the spacer, I checked the plug and this is what it looked like, which from my pops advice is supposed to indicate too lean, right?

So if I did the 1/3 spacer mod, does that richen the mixture slightly where this will hep clear up this sooted plug, or do i need to back out the air/mix screw a little also and hit it on both ends?

Overall it runs good, just taking tips from pops on how to diagnose a plug to try and dial things in.

Thanks.

Title: Re: Plug Diagnosis
Post by rfw2003 on 09/24/12 at 19:30:54

Actually you are running rich. Lots of carbon build up like that indicates a rich condition. You are shooting for a light tan color on the insulator.

Head on over to the Tech section and then Table of Contents thread and you will find a link for reading plugs in there.

R.F.

Title: Re: Plug Diagnosis
Post by clearush on 09/24/12 at 19:37:10

http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1126253987

second picture

Title: Re: Plug Diagnosis
Post by verslagen1 on 09/24/12 at 20:22:50

yeah there's some carbon fouling, but not near as much as the 2nd picture, the insulator is still mostly white.

as long as your fuel mileage doesn't tank, I think it's fine.

Title: Re: Plug Diagnosis
Post by stewmills on 09/24/12 at 20:29:47

170413120D0006040F50610 wrote:

yeah there's some carbon fouling, but not near as much as the 2nd picture, the insulator is still mostly white.

as long as your fuel mileage doesn't tank, I think it's fine.

Thanks all!

So as far as gas mileage, I haven't had a chance to really nail it down since I have been draining the tank to tinker, but I think I am somewhere in the ~45mpg range...but not certain.

Based on the assumption that this is too rich, should I make any non-jet adjustments to the spacer or air mix screw to resolve, or are there too many combinations to guess exactly which this is a result of?

The reason I did the spacer mod again is because it seemed a wee bit sluggish at above idle speeds, and when I did the spacer mod before the rejet it really smoothed out this range in my bike. Hope that doesn't make it more rich?!?!