Running rich Raceway needles

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Mike Robinson
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Running rich Raceway needles

Post by Mike Robinson » Mon Nov 18, 2019 3:22 pm


Jets 40/130, clean air filter, balanced carbs

I have the raceway needles set to the same length as the standard needles.

I am running rich - black sooty plugs, otherwise runs very well.

What could I do you get the plugs more brown? I have read that I can adjust the needles. Is it shorter needles, less fuel?

Ideas welcome!


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Re: Running rich Raceway needles

Post by Msblu79 » Mon Nov 18, 2019 3:26 pm

Lowering the needle leans the mix, raising it will richen the mix. Drop it one notch at a time and run it for a while and see what the plugs look like.
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Re: Running rich Raceway needles

Post by Ajax » Mon Nov 18, 2019 3:35 pm

Having the clip higher on the needle will lean it out as the needle will start off in a lower position. Having the clip lower on the needle will richen it as the needle will be in a higher starting position.

I would look into a Colortune plug. It really helped me sort out the carb jetting and adjustments. ... on-chamber

Also check out the Carb section of the How to.

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Re: Running rich Raceway needles

Post by chaos2 » Mon Nov 18, 2019 3:44 pm

when I was adjusting mine I ran at least a tank of gas between each tweak, noting mileage, general driveability, ease of starting, etc. I'd raise the clip one notch and see what happens. Jets seem well chosen for a stock set up.
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Re: Running rich Raceway needles

Post by rivers » Mon Nov 18, 2019 3:59 pm

You checking plug color after a spirited ride or after it's been idling awhile? At idle or low speed bimbling around town will soot up your plugs. You need to go make a decent hwy run to clean any minor soot off. At idle or low speed (<1/3-1/2 throttle opening(?) you're running mainly on the idle jet circuit and fouling plugs. Beware of the old school plug color charts found in every old USA shop manual. The desirable old tan - coffee w/ cream color doesn't really apply to todays modern unleaded fuels. Tan today is now "too" lean and you're shooting for pretty much just "clean".
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