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aidan1990

pit bike carb screw adjustments

13 posts in this topic

hello.

I had a problem with my bike fouling spark plugs, its running to rich and i know its to do with the carb settings. the mixture screw probably needs adjusting.... what i wanted to know is a base line to work with on both the idle and mixture screw.

the carb is a mikuni and the only way to adjust the mixture screw is to take the whole carb off since the screw in on the under side of the carb. (i cant fit a screwdriver between the carb and engine)

i wanted to save time and ask for an average setting please. so i don’t have to keep taking the carb off and probably end up rounding the bolts.

thanks for reading, all help appreciated

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First get one of theses from Staggs.https://s.p6.hostingprod.com/@www.staggsminis.com/ssl/store/product_info.php?cPath=62_91&products_id=265&osCsid=f965790224a2a3b65

makes tuning a whole lot easier. I start with the screw between 1.5 and 2 turns out but thats what has worked for me. Search for a tuning/jetting thread by Precision50. Its a great resource, I used it and my bike runs awesome. Good luck

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cheers guys, i will give it ago abit later on.

about the carb adjuster on staggs, does it replace the screw thats already in the carb?

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Yes, just take the old screw out and screw the new one in. After I got the screw from Staggs it was like night and day tuning the bike, will worth it

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I NEED THIS SCREW!!!

and they are backordered....anywhere else have the same thing as staggs? will a regular both work? I could atleast get a wrench around a bolt head

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I NEED THIS SCREW!!!

and they are backordered....anywhere else have the same thing as staggs? will a regular both work? I could atleast get a wrench around a bolt head

the air/fuel screw in a tapered (Precision) jet ...a bolt aint going to do it

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I have that carb on a bike and yes it's a pain, but you can undo the inner bolt on the manifold and loosen the other and pivot the carb out and adjust and try again. It is a fuel screw, so turning it in leans the mix and turning it out richens it.

Definitely the screw from staggs is a plus, but until he has more in, you can still get the bike right.

If you go less than 1.5 turns from bottomed out and it's still too rich, you need a leaner pilot jet.

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Click on the pic below for more information...

carbtool.jpg

...you can order this right from the ThumperTalk Store above, in the Parts Unlimited Catalogue

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Click on the pic below for more information...

carbtool.jpg

...you can order this right from the ThumperTalk Store above, in the Parts Unlimited Catalogue

I do not believe it will fit under to work on our Pit Bikes....as I have one that looks just like it I use to tune Preformance Six pack Carbs on this Bad Boy

DSC02475.jpg

it may work if the bend is under 1 inch

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