Take a look at my spark plug. What do you think?

**mayhem17** · 06-02-2015, 10:39 PM

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So, off idle if I hit the gas hard it tries to stall out. Seems a bit doggy also through the revs. Only thing not stock is the K&N air filter. Went from a 130 main jet to a 140. Seemed to help off idle a bit. Plug was much more white before changing jets. Ideas?

**oscarmayer** · 06-02-2015, 11:05 PM

i think it's a sparkplug!

looks rich. drop 2 jet sizes i would have done a 132 or 132.5 (what ever the next size up is) main only. had the same issue with my son's race quad.

**mayhem17** · 06-02-2015, 11:27 PM

I thought rich at first also, but acting like its running lean. Bogs bad until I get the rev's up a bit. Also doesn't rev down as quick as I think it should. If it were rich though, would it be that white in the center like that?

**mayhem17** · 06-02-2015, 11:46 PM

Was thinking of dropping the main down a size, and maybe pilot up one?

**Jmoozy27** · 06-02-2015, 11:53 PM

It's rich, the arc is what makes it white. What you want to look at is the middle porcelain area, not so much your gap but all the way down into the plug. I run a 135 in my BR and it is still a tad rich. The BR motor is just hard to squeeze more power out of. I hate my following statement but: it is what it is.

Unless of course you go with a MD-BB kit.

**phantomtracer** · 06-03-2015, 12:05 AM

I second or third that: Looks rich, lots of unburned fuel there.
If you jet too rich it can fool you into thinking its lean as it bogs.
quick unscientific check is to shut the fuel petcock off and as the float bowl starts to run down the mixture will lean out.
You should notice the throttle response improves as you blip the throttle when the fuel mixture leans out.
Could also remove the air filter to help lean it out a bit more for testing purposes.

**barnett468** · 06-03-2015, 12:55 AM

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what is your elevation?

that is not just rich, it is filthy pig rich by a mile.

make sure your air filter is clean or try it without as phantomracer suggested

make sure you have the correct heat range . . a plug that is too cold will carbon up because it is not hot enough to burn it off.

put your needle clip in the center position

go down 3 sizes on the main to start.

leave your pilot as it is for now . . if it pull starts easily, then your pilot is pretty darn close.

install a new plug . . if you dont have one, clean the bejesus out of that one with carb cleaner and a tooth brush

if it spits and sputters when you first accelerate, it is rich . . if it simply hesitates like it is out of gas, it is lean but it can sometimes be hard to tell the difference so pay close attention.

PS - The good news is that it is a honda and it runs, and that it does NOT look like it is burning oil.

**mayhem17** · 06-03-2015, 10:01 AM

It doesn't sputter at all. It hesitates like it's out of fuel. Shutting fuel off makes it worse. It had this issue before I went up on jet size. Got much better after going up.

It starts up first kick no problem. You have to slowly roll on the throttle off idle or it just wants to quit. Feels just like when you forget to turn your fuel on when you go ride.

**Jmoozy27** · 06-03-2015, 10:54 AM

Have you checked your needle clip?

**oscarmayer** · 06-03-2015, 11:02 AM

it's rich!!!!! fixor it!! several of us told ya, drop in a 132 main then get back to us or go back to the stock for testing.

**250rRoostmaster** · 06-03-2015, 12:29 PM

If it bogs off idle your pilot is lean.... How old is the plug? Need to use a fresh plug and do a plug chop...

**mayhem17** · 06-03-2015, 01:29 PM

Plug is brand new. Put it in to check it actually. It doesn't so much big off idle as it completely falls on it's face like out of fuel. If I roll on it slower it's fine, but can tell it's also bogging throughout the revs. Hence why I thought lean. Then pulled it and saw black. Although bit wet.

**mayhem17** · 06-03-2015, 01:30 PM

And yes, will drop it down tonight once I'm home abd try that. Stock was definitely lean.

**oscarmayer** · 06-03-2015, 02:34 PM

ok. good luck and let us know. but I would say with a filter you probably need 1 size up only.

**barnett468** · 06-03-2015, 06:26 PM

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ok we have no idea exactly what mods or changes you have so the following is what i would do . . you can NOT easily or even properly jet a bike if the float level is off very much so that is the first thing i would look at and fix if it is off very far.

how old is the gas?

put some gas in a clear glass and look at it . . if it is yellow, it is bad.

you can put an 8" long piece of clear plastic line on the float bowl drain fitting

tape it to the carburetor so the end of the line is near the top of the carb.

turn the gas on at the gas tank.

loosen the screw on the float bowl.

gas will enter the clear line.

the level of the gas should be around 1/8" - 3/16" below the main carb body where it meets the float bowl . . if it is above the bottom if the main body, it is definitely too high and might be flooding it.

if you don't have a clear line you can use a black one . . just lower the open end of the line until gas comes out and gets on your engine and your floor . . the point at which it starts to run out will be the gas level.

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...........................................i think it should be at or just below the solid black line in your case.

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.................................................h ere's another and you can see the is level way too low.

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Take a look at my spark plug. What do you think?