Is my fuel air mixture good based on spark plug?

[GearNut]

Grey with a hint of brown is definately better. The grey is caused by additives in the pre-mix oil that you are using. nothing wrong with it. If it were silver I would be worried.
Silver is burnt aluminum from the crown of the piston getting deposited onto the spark plug. An air leak will cause a lingering high idle that slowly drops down to normal. Check it out before trying to adjust the fuel/ air mixture any further.

 

[StrontiumEthics]

Lol. So far today it ran very nicely. It stopped the stuttering at high RPM when the engine was nice and hot. How Can I get rid of this Carb leak? Its really annoying when I want to slow down and clutch and the engine keeps revving. It wasn't like that before.

 

[StrontiumEthics]

I have read in the forum I can get an O ring. But is there a something else that I can do with the carb? One time I tried putting grease along the exposed area but after a while it got really dirty so I don't know if its a good idea.

 

[StrontiumEthics]

It looks better.
How did it run?

It ran great today.

 

[GearNut]

Do not do the o-ring trick!
The only way it will work is if you push really hard on the carburetor to compress the o-ring and hold it there while you tighten the mounting clamp.
If the o-ring is not made out of the correct rubber (Buna-N) it will react with the fuel and get soft and swell up to the point where it will not fit in the space it has to live in, eventually getting sucked into the engine.

A thin coating of Hylomar on the intake manifold, will seal it up very well and be easy to clean up in the future if needed. A q-tip dipped in acetone works well for spreading it around upon application, and a rag wetted with acetone removes it.

 

[StrontiumEthics]

Where exactly am I sealing up on the carb? Just the manifold? While I am there should I replace the studs that hold the manifold into the head? They got loose once already.

 

[GearNut]

You are sealing the manifold to cylinder and the carburetor to manifold, both ends of the manifold really.
You can replace the manifold to cylinder studs if you want to, but few folks ever have a problem with them. As for coming loose, these engines seem to vibrate everything loose, even the fillings in your teeth.
Loc-tite 242 Blue is a common thread locker used on the offending fastners.
Some folks swear by it, some swear at it.
Those that swear by it usually do a visual inspection of the bike approximately before each ride, fixing or adjusting things as they get to them.
Those that swear at it typically go over the entire bike frequently and religiously keeping everything is tip top shape,torque, and tune.

 

[StrontiumEthics]

You are sealing the manifold to cylinder and the carburetor to manifold, both ends of the manifold really.
You can replace the manifold to cylinder studs if you want to, but few folks ever have a problem with them. As for coming loose, these engines seem to vibrate everything loose, even the fillings in your teeth.
Loc-tite 242 Blue is a common thread locker used on the offending fastners.
Some folks swear by it, some swear at it.
Those that swear by it usually do a visual inspection of the bike approximately before each ride, fixing or adjusting things as they get to them.
Those that swear at it typically go over the entire bike frequently and religiously keeping everything is tip top shape,torque, and tune.

SO Do I still use the normal intake gasket?

 

[a/c man]

Keep the intake gasket on.
I also use Hylomar gasket sealer on my bike and car (water pump)
Coat the gasket but don't over-do it with the goo.
Nobody has asked, but have you checked your throttle, throttle cable, cable tensioner, and throttle slide to insure that its not binding in any way to return the throttle back to idle? It should return back crisply and you can hear the throttle slide bottom out if the engine isn't running and you goose the throttle and let it go out of your hand.
That spring inside the carb isn't big or strong enough to overcome a lot of resistance in the throttle twist handle, cable, and throttle slide set up.
Just a thought ..trying to cover all the bases buddy.
Also that cap on top the carb is crappy and will distort if you tighten it down just a little too much with channel locks, Mine has hung wide open on me once or twice and scared the poo out of me.

GLAD TO HEAR YOU GOT IT RUNNING BETTER.
These bikes are like an ongoing science experiment.
TIM

 

[StrontiumEthics]

Oh ok. The throttle is what i have to look into. Is there a stronger spring that i can use instead? I believe it comes down enough. But I just installed some silicone gasket sealant on the intake gasket, and the intake manifold into the carb. As of now i'm letting it dry. Tomorrow I will be checking the throttle cable.