Bonneville America Forums Forums Technical Forums Performance Mods Cheaper source for mixture screws

Does anyone know of anywhere to get the thumb screw type mixture adjustment screws without dropping $40?

I'll sell you a set for $20...

And why aren't you using them?

I'm using the ones from Brent and am very happy with them.

I ended up with two sets of them...

PM sent.

so far best I have been able to do is mixture screws

but I'm gonna keep looking.

dang! now that is a deal!!!

No I think that price is for 1 so not so good.

bummer that sucks. i was getting ready to order...

Those are also the ones for the CVK40s so the taper is much narrower than the stockers or Brent's.

Here's a photo showing the difference (left is stock, middle is the CVK40 type, right is one of the pair I got from Don and are an exact copy of stock):



Note the small size/taper of the CVK40 one...

Good Photo! That tapper is a lot smaller, Does Keihin they make thumb screws for the CVK36?

I don't believe so

I have a set for the cvk40 and I can not get the mixture screws to make a difference. I can screw them all the way in or all the way out and the bike still runs the same. I would like to try the ones from Brent but I also want to try the Mikuni's. So If you were looking for new mixture screws I would lean towards the ones that Brent sells. Just my opinion, but I think others have had similar problems with the cvk40 mixture screws.

If your mixture screws make no difference, your pilots are likely too big.

Ron, I had a similar problem with the CVK40 screws. I had them almost all the way in and it seemed even a 1/16" turn would screw them up. Could not get them to set right. Went back to the stocks until Don graciously sent me the ones he had made up by a friend of his.

Bryan, the CVK40 screws are just too small (taper) IMO. I was using 42 pilots when I had them in. I would advise against them and advise for getting thumb screws that have the stock taper.

Phil- Hmmm. Thats disappointing. I just sold a set to Rick (nologic) that started this thread. They are the ones from Bella Corse. I guess they are for the 40mm's? I assumed they were for our bikes. Now I feel bad- like I sold him junk or something.

I had the same problem when I was running 45's. I moved to 42's and they seem to work fine.

Rick- if they don't work, let me know- I'll give you your money back. I also have a set of stock screws that someone ground a slot into so a standard screwdriver would work that I can send you- or you could make a slot in your own.

Sorry about that. I was disappointed by them also. I got mine from another source but they are they same.

btw, at one time I had thought about JB Welding some 'thumb screw heads' onto the the stock mixture screws. I was going to cut each part to interlock with each other. Then Don sent me perfect thumbscrews!

Some food for thought perhaps?

Thanks Bryan. I'll let you know. I was going to ask you who they came from but I figured you knew that they were the right ones.

Hey. Who knew. One of our premier vendors is selling an item that is advertised as a product for our bikes. I have to assume it is until I learn it isn't.

If you want, you can just refuse the shipment. I'll refund your money either way.

Hey, I'll give them a try first. If they work our deal stands.