Check cylinder compresion
I have a 2006 STX 1500 that would stutter a little at low rpm then at mid to top range would run fine. Turns out the number 1 cylinder had about 90 psi compresion and should have been over 200 psi according to the mechanic. It turned out to be the valve stem seals leaking. The number 2 cylinder was at 180 psi. I had them replace all of the seal at one time. I only had about 90 hours on the ski and in general it was not run all that hard. I was a little disappointed and concerned with the longivety of the seals considering the cost to have them replaced.
I have a 2006 STX 1500 that would stutter a little at low rpm then at mid to top range would run fine. Turns out the number 1 cylinder had about 90 psi compresion and should have been over 200 psi according to the mechanic. It turned out to be the valve stem seals leaking. The number 2 cylinder was at 180 psi. I had them replace all of the seal at one time. I only had about 90 hours on the ski and in general it was not run all that hard. I was a little disappointed and concerned with the longivety of the seals considering the cost to have them replaced.
