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Well it’s been awhile and we took it to a mechanic who said my top end needed rebuilt with 130 compression in one side and 90 in the other piston. We also found a tiny exhaust leak that needs fixed aswell. Hopefully after the rebuild it should be running good.

It was running good before we got the upgraded carb. We just decided to switch carbs because we heard the Sbn was a good upgrade to have. And yes it was a genuine Mikuni carb bought brand new.

Thanks, will do.

Will the other jets, needle and seat be alright to keep?

Ok thank you for the help I will try with your advice and go from there.

Pop off pressure is good and is right at 20psi. I ordered a jetting kit from watcon that said if you tell them about your ski and where you ride they will send all the right size jets, etc. I’m wondering if they just made a mistake or what.

Here are the size jets that are in it

I’m having trouble getting my 1988 js550 to run properly. Low speed it is fine but every time you get on the throttle all the way it goes good for a couple seconds then bogs way down and you have to flutter the throttle to keep going. Everything is stock besides aftermarket Mikuni sbn 44 with...