Hey all! New member here, need some help understanding jetting basics. Problem: 98 Superjet smokes real bad at low RPM, cleans up at high RPM
History: Grenaded the modified motor several years ago, and replaced with a Yamaha factory short block. Kept the aftermarket 44 carbs,manifold, pipe, waterbox, on it. Recently replaced the MSD, CDI and coil with new ones, and rebuilt the carbs. Runs strong now but has always been too rich up here in Colorado at 5280 elev.
Question: What jetting should I use as a starting point? Current jetting is 120 slow jet, 1/2 turn out on the needle. 130 high speed jet, 3/4 out on the needle.
Pop off springs are the black ones.
Also would like to know if anyone knows what brand of pipe is on it, can't find any info on it.
I know all about dirt bike motors but this ski is a different beast, so bear with me if I seem to ask some stupid questions. I'm sure I'll catch on pretty quick.
History: Grenaded the modified motor several years ago, and replaced with a Yamaha factory short block. Kept the aftermarket 44 carbs,manifold, pipe, waterbox, on it. Recently replaced the MSD, CDI and coil with new ones, and rebuilt the carbs. Runs strong now but has always been too rich up here in Colorado at 5280 elev.
Question: What jetting should I use as a starting point? Current jetting is 120 slow jet, 1/2 turn out on the needle. 130 high speed jet, 3/4 out on the needle.
Pop off springs are the black ones.
Also would like to know if anyone knows what brand of pipe is on it, can't find any info on it.
I know all about dirt bike motors but this ski is a different beast, so bear with me if I seem to ask some stupid questions. I'm sure I'll catch on pretty quick.

