a or f

I recently put a UFO 4-2 exhaust on my vmax, and it seems to run different at highway speeds (around 4.5k rpm). Hard to tell if its misfiring or backfiring. It just doesn't sound smooth. So I went to adjust the mixture on the carbs and all of the mixture screws were between 6 and 8 turns...

Well all summer I dreaded taking care of this right side a/f mix screw because of all the horror stories ive heard about getting them out so what better time to deal w/ it ? winter time . I removed the rack of carbs & secured them to my bench I took a 1/4" drill bit & drilled a pilot hole in the...

I have Marks 4-1 with the needles shimmed .30. Its running good. I've been racing and the times are what I think are respectable. I decided to look at the plugs after I raced last week. it looks like its running pretty lean. My question is, what do I need to do to richen it up a little. I know...

Hey guys, Just wondered your opinion since I am completely stuck here. I want to be able to effectively correct my a/f screws by using a portable tool without killing my budget. I've herd of things like the Gunson Gastester, or their colortune, yet I've herd some pretty bad reviews. What...

I was checking to make sure my a/f screws were all correct and discovered that one of them only has about 1/4 of a turn play in it. For some reason is seems to be stuck there. Any ideas about how to fix that? I was thinking of pulling the carbs this winter and cleaning them all up...maybe even...

Hi Folks, Yesterday I had my carb's synchronised and wanted them a/f finetuned. The synchronising worked realy well and made a lot of diference directy! Idle the engine was running directly very smooth. second stage was fine tuning the air fuel mixure. The 2 litlle srews on the left side...

Looked but could not find a How To Adjust A/F pilot screw. Does anyone know where in the tech area or how to area I could find a pictorial and verbage on how to adjust it. Got a new one installed in carb 3 and would like to adjust it properly for idle mixture. Thanks.

Okay guys here's a tough question. My fuel screws are seized in carbs 1 & 2. The cylinders only fire when I blow through the fuel vent hose which forces fuel into the idle circuit. I adjusted 1&2 carbs vacuum to pull harder, hence pulling more fuel. Now all cylinders are firing but I can't seem...

Where the heck is the procedure for setting the A/F screw positions? I know that a dyno or an A/F meter is the best way, however I thought I recall a procedure to get you close for those without access to these resources. Since waking the bike up after it's long winter nap I have had a...

Hey all, I am in the middle of doing the shotgun on the carbs. What does everyone use to clean up the a/f screw and spring? Mine has the white chalky looking buildup on it. Also, how can you tell if the end of the screw is damaged from being bottomed out too hard? Thanks.

Hey all, I am trying to get the bike dialed in as good as possible. When setting the a/f screws does anyone ever hook up the carb sync to watch each cylinder? Reason I ask is that I don't notice a whole lot of difference once I start untightening the set screw on the a/f. I can tell when it's...

After re-rebuilding my carbs that have been sitting over 16 years, I got the bike running well. The only issue is some popping during slightly choked warm up. The A/Fs are 3 turns out now, can getting them dialed in correct the backfiring? Is the proceedure to screw each in till idle suffers and...

anyone know how to get these bad boys completely out ??????

I need 4 or 6 A/F mixture screws O-rings. Thanks

Anyone know of a portable type of air to fuel meter? I've looked but most that I see you have to drill holes in the exhaust and I'm not into that. I was thinking one that maybe clamps to the exhaust with the sensor that goes down into the exhaust. Any idea's?

Just put the dj stage 1 finally got tuned pretty decent. Was checking the plugs all looked ok except for one had a lot of carbin so was wondering there all turned out 3 1 /2 turns do they all have to be the same or can you adjust them individual at different turns each.

My 04 has a 4-1 Hindle, stock air box and stage 1 installed by the po. No idea what size jets are in there, but after talking with Sean, I moved the needle to the clip closest to the blunt end. It seemed to be running rich, i.e. my buddies said it smelled like unburnt fuel when I got on it...

I added a Marks 4-2 exhaust with the 14" cans and had my bike dyno'ed to see what adjustments need to be made. The dyno chart shows me very lean at idle then rich from about 2K all the way to red line. My A/F ratio from 2K up is around 12-1 I would have thought a better breathing exhaust would...

I just have some rubber boots shoved into the mixture screw holes to protect them from getting dirt in. I removed one and noticed fuel in the hole. Anyone seen this? Is it a concern? Thanks

I just placed an order for 200 of the little buggers. Let me know if your needing any. Price will be just for shipping.