Black spark plugs...

[Flatnut]

Hi there,
Anyone can help me with my issue. My plugs on 1,3,4 are black and 2 a little yellow. Recently cleaned my carbs and put 1-3 jet kit in it.
Thank you!
AAH

 

[Guest]

Is this a Suzuki? A Dynojet kit?

 

[Flatnut]

Yes it is and yes they are

 

[Guest]

Did you get a set of 34s to put on that 850/1100 swap?

 

[Flatnut]

Hi
What is a 34s?

 

[tejasmud]

Fix the rich AFR..


Spark Plug Cleaner






E

 

[Flatnut]

LOL...what's an AFR??? sorry. I ended up ordering the facotry jets instead. That should help...?

 

[mighty13d]

AFR=air fuel ratio. Too much fuel ends up making black sooty plugs. Lean makes white flaky plugs. you want plugs that look fairly clean.

 

[Flatnut]

THANK YOU. Not sure how to adjust that either. My manual doesn't show it well. I think my jets are too big.

 

[Guest]

THANK YOU. Not sure how to adjust that either. My manual doesn't show it well. I think my jets are too big.

That's how you adjust it. Jet the bike using plug chops. You should have light tan plugs.
Do a search for "plug chops".

 

[mighty13d]

THANK YOU. Not sure how to adjust that either. My manual doesn't show it well. I think my jets are too big.

That'd be it. but it also depends on if they were black from putting around town or from being at WOT (wide open throttle) blasting down the highway. That would change which jets you are running on. If you change the main jets out but you put around town all day, you will get the same results as now.

 

[Flatnut]

I wish there was a screw I could easily adjust the AMF...I go from cruising to open throttle almost all the time. I also have an after market exhaust least resistance as well.

 

[Flatnut]

Hi
Yes dynojet...now the black is gone, carbs are sync and the motor is lean...backfires still. I think it may be the timing but I am having trouble figuring out how to do it. It's not the traditional timing system.