How many clips are still holding your stock lid on?

 

No lid for me. Just the Pro-Design adaptor and foam filter.

I agree that 185/190 seems strange, and the plug reading at that jetting is even more strange. Maybe I'm not getting enough air velocity to bring the slide up all the way into the main jet circuit and I'm still operating in the needle circuit, which is lean and hence the plug reading??? I'm grasping here.

The only problem I have with the air velocity theory is that there are folks running with dual K&N filters going straight into the carbs with no airbox whatsoever. How are they getting their air velocity?

Do you know where that CV carb tuning link is? I've spent so much time on this already that I'd like to figure out the answer to this problem.

 

I found a CV carb tuning description at www.factorypro.com. Go to the "Motorcycle Tech" link at the left and click on "CV Carb Tuning" I'm still not past the first stage.

Unfortunately this site says to start with the main jet and work your way back to the needle and float level after you've got the engine running strong at full throttle high rev, which is what I was doing.

So I called Pro Design and talked to a nice guy there who apparently designs their products. He said he doesn't run with the air box lid off and doesn't recommend it. He also didn't have any jetting suggestions for that configuration when using a stock pipe since he doesn't run that way. Hmmm.... I would have thought he would try his product out on a stock machine with the most common air box mod: no lid. Guess not. His suggestion was to move the needle up and playing with the main jet from that point since I may not have been getting out of the needle circuit. That was one of my ideas as well, so I guess I'll give that a try the next time I have a chance. I still don't understand how I'm not getting beyond the needle circuit when I'm revving that high in fifth gear, but since I can't see how high that slide is going, I don't really know.

 

When my bike was stock....I took the lid off and it ran terrible. The stock exhaust can only flow so much air due too it's restrictive and quiet design....so you have all of this flow potential with no-where for the air too go. You are encountering some MAJOR turbulence problems. Put the lid back on and jet at 145-150 with the exhaust baffle removed and thats all you are going too get with the stock exhaust. 3rd groove with the stock needles is the only location my Raptor would run perfect at.

 

Have you tried adjusting your needles up and down. I had to adjust mine down. So maybe you could try that.

 

The only time I fiddled with the clip was when I was at 185/190, but that was before I modified the screen tubes inside the filter. I see from my notes that it ran kind of similar with the clips at both the third and fourth position. The next time I get to it, I'll probably start off at the 185/190 4th clip and hopefully I'll finally get a rich reading and I can work my way back from there. Otherwise I'll have to restrict the intake a little. An outerwears will probably make a fair difference.

This all started last year when I got a used Raptor with the Pro Design filter and the full CT setup. The pipe had a race tip on it and I didn't get the discs or needles like it comes with now. It ran like crap, so I jetted up (all the way to 185/190 with the needle in the 4th clip), and it still fell flat on top, just like this Raptor did after I put that Pro Design filter on it. I posed a question on here a while ago about what was going on, and the concensus was to sell the pipe because people have problems jetting it. I kept it anyway, and just took the filter off that quad and put it on the one with the stock exhaust. I guess the pipe was not the problem, or at least not the only problem.