The rich bottom end will cure the lean bogging that most here have experienced, and most racers running these series of picco's will all have to run the botttom end very rich. When I first hit the track, it takes the motor almost three or four laps before it really clears out and gets some temp in the engine. Until it does this it's pretty sluggish, and kinda grumpy. Most other engine clear out after a lap or two............and that's where most have made the mistake of wanting to lean out the bottome end. Me included .........in the beginning.

Another tuning tip.........for this motor...........and others is clutch. I used Mike Swaugers clutch tuning tips to set up my clutch.........and simply put it's the best clutch I've ever run! One of the key points that I see all the time at the track is a poorly set-up clutch, and the racers believing it's a bad motor. Many racers do not shim the endbell from the clutch shoe far enough. That is very important. The clutchbell needs to spin freely without making contact with the clutch shoe. If your car is idling and you can push on the clutchbell and feel it touch the clutch shoe...........and the engine drops in rpm...........it's not shimmed properly. In my Mugen, I use a one half of a thrust bearing between the end of the clucth nut and the first clutch bell bearing. The spacing is perfect for this clutch. On other clutches you'll have to experiment to get the right shimming to space the clutchbell form the show.

Spring tension. I was talking with Josh Cyrul the other day and got one of the new Orion square wire springs used on the CRF. I love this spring. It's very very progressive in it's adjustments. On my mugen with the JLR my clutch gap for the spring is 1.65 mm(the distance between the end of the threads of the flyweel nut and spring nut) That's a pretty tight clutch. I gain over 5,000 rpm up the engine scale of acceleration with others who's setting is to soft. What that means.........is my engine will be further up the power band before engaging.........and will acclerate all the way through the powerband faster. Others think it's just my motor.........but it's not. Most of the guys reading this here already know this........but I thought I'd throw it in for some of newbies.