Hi All,,
got a funny problem eith my sj, and was wondering if anyone could point me in the right direction.
Firstly the setup: stock motor with limited "B" pipe, jetting as per FP instructions (wax has ridden the ski and jetting is OK)
the problem occurs on the second tank of fuel after running 1 tank thru. After filling the tank the ski runs rough in the low-midrange (runs fine up top), sort of feels like its running on one cylinder but becomes better as the fuel level drops. The most obvious sign somethig is wrong is that sometimes after a landing a stab when the ski lays on its left (carbs high) it won't rev i.e: hold wydopen on side gets just above idle and thats it, this doesn't happen all the time maybe once every 5 stabs straight the ski up and away it goes. Also adjusting headpipe screws doesn't seem to make a big differnce to the power delivery.
couple of theories:
1: needle and seat are worn causing rich condition when ski is on it side?
2: overfilling the tank then as the fuel expands its opening the needle valve slightly causing rich condition?
ski is an 07 with approx 75hrs
any help greatly appreciated
Matty
got a funny problem eith my sj, and was wondering if anyone could point me in the right direction.
Firstly the setup: stock motor with limited "B" pipe, jetting as per FP instructions (wax has ridden the ski and jetting is OK)
the problem occurs on the second tank of fuel after running 1 tank thru. After filling the tank the ski runs rough in the low-midrange (runs fine up top), sort of feels like its running on one cylinder but becomes better as the fuel level drops. The most obvious sign somethig is wrong is that sometimes after a landing a stab when the ski lays on its left (carbs high) it won't rev i.e: hold wydopen on side gets just above idle and thats it, this doesn't happen all the time maybe once every 5 stabs straight the ski up and away it goes. Also adjusting headpipe screws doesn't seem to make a big differnce to the power delivery.
couple of theories:
1: needle and seat are worn causing rich condition when ski is on it side?
2: overfilling the tank then as the fuel expands its opening the needle valve slightly causing rich condition?
ski is an 07 with approx 75hrs
any help greatly appreciated
Matty