2000 rx

[TonyR]

need some help! not sure what problem is!
my seadoo starts up and idle's fine, actually from 1200 rpm to 2600 rpm is fine however when you go from 3000 to 4900 the engine surges back and forth like its starving for gas. after you hit 5000 its fine all the way up to around 6200 and then its like the rev limiter kicks in.
I have adjusted the low speed jets both in and out a quarter turn at a time but it doesn't help either way.
any words of advice!!!!

 

[kustomkarl]

I would change the spark plugs first, and see if it helps. If it doesn't it sounds like you have a mid to high speed problem. It might be in the carbs. The low speed adjustment only adjust the low end not the mid to high speed adjust.

Karl