I need some help understanding jetting and how to adjust it.
I have three bikes I am currently playing with. Each has a similar problem, they seem to be running rich from 1/8 to 1/2 throttle. It doesn't bog, but gives something of a machine gun with low power. If you shift to 2nd or 3rd gear and give 1/2 to full each runs like a top. One of the MR175's (cherry) practically stands up (it has a martek cdi).
MT250 3.5 slide, 102 main, 48 slow, points - I changed the slow from a 48 to a 50. This had little or no effect, except it feels a little smoother through the whole power band. It is still a little machine gunny up to 1/4 throttle, and a little boggy taking off from idle.
MR175 (White) 3.0 slide, Unmarked main (has a silver sleeve in the jet), 50 slow. I changed the slow from a 50 to the 48. It now hardly wants to run. Very machine gunny on low and I have to run it at near full throttle. Seems to run even richer than before. This bike as a 76 CR125 ignition.
MR175 (cherry) 3.0 slide, 122 main, 60 slow - I switched it to a 48 slow. It now hardly wants to run below 1/2 throttle, and it now does not have any power above 1/2 throttle.
I thought using a lower numbered jet would lean out that portion, but it seems to be doing the opposite. I am also confused by the effect on the top end I am receiving by changing the slow jet.
Any suggestions?
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Obviously something else happened to it other than the pilot jet change (a 48 pilot is correct IMO) - with that problem corrected, the 3.5 slide, the needle clip at the #1 or #2 position, and the air screw 2 turns out, this bike should run a lot better below 1/2.