cartwright
New Member
Hoping to get some help on my 99 GTX with the 951.
I've had this ski for 2 seasons now, it ran good until a crank bearing let go recently .
Some history, after getting the ski the carbs were rebuilt and all fuel and oil line components were replaced, compression was 130 on both and the ski ran well, only issue is that there was a surge at cruising speed at around 5000 rpm when trying to maintain speed. Wot is was smooth.
The ski did have a exhaust manifold water leak, problem happened at higher rpm and motor would hesitate and then die. Leak was fixed and problem went away but I have no idea how long this leak may have been going on before I got the ski.
When the bearing let go the engine died instantly. The motor would start back up but sounded real bad. Towed it back to the launch.
Compression was about 90 psi on both cylinders, so I pulled the engine and tore it apart, turns out the pto cylinder is badly scored on the side opposite the exhaust and the crank rod bushing on the mag side had the slop in it.
The other thing I noticed was the crank and counterbalance weights were not opposed to each other as I thought they would be , the picture I took was not when the alignment marks were aligned . Mag side also seemed to have less oil on the crankshaft.
So I'm not sure why compression is low on both sides and why the counterbalance shaft seems out of alignment with the crank and any other comments
I've had this ski for 2 seasons now, it ran good until a crank bearing let go recently .
Some history, after getting the ski the carbs were rebuilt and all fuel and oil line components were replaced, compression was 130 on both and the ski ran well, only issue is that there was a surge at cruising speed at around 5000 rpm when trying to maintain speed. Wot is was smooth.
The ski did have a exhaust manifold water leak, problem happened at higher rpm and motor would hesitate and then die. Leak was fixed and problem went away but I have no idea how long this leak may have been going on before I got the ski.
When the bearing let go the engine died instantly. The motor would start back up but sounded real bad. Towed it back to the launch.
Compression was about 90 psi on both cylinders, so I pulled the engine and tore it apart, turns out the pto cylinder is badly scored on the side opposite the exhaust and the crank rod bushing on the mag side had the slop in it.
The other thing I noticed was the crank and counterbalance weights were not opposed to each other as I thought they would be , the picture I took was not when the alignment marks were aligned . Mag side also seemed to have less oil on the crankshaft.
So I'm not sure why compression is low on both sides and why the counterbalance shaft seems out of alignment with the crank and any other comments
