2 stroke help

Eddyj · Nov 17, 2014

I have a 96 ish Kawasaki 750 duel carb jet ski. It ran fine for about 3 hours. It sat for 4 days then wouldn't start. Pulled the plugs and one cylinder has no compression. When I took the head off. He cylinder with no comp was dry and black. Other cylinder with comp was wet.
I know just enough to know to ask for help. I have no real experience with 2 strokes or jet skis.

Eddyj · Nov 17, 2014

Eddyj · Nov 17, 2014

No comp cylinder

Eddyj · Nov 17, 2014

Cylinder with compression

LightBnDr · Nov 17, 2014

You either have a top end issue (stuck ring, worn piston, scored etc..) or a reed block that's completely destroyed. Reed block sits behind the carb. Remove the carb and you can pull the reed block by hand

Eddyj · Nov 17, 2014

Reed block never heard of that. I'm guessing similar to a reed on air compressor? Flat piece of metal only let's air in?

Jason454 · Nov 17, 2014

Carb was to lean on that side time for a rebuild.

Eddyj · Nov 17, 2014

I'm not saying it has had a good life. I'm just trying to figure out what happened. Rode it for about 3 hours parked it came back a couple days later and it won't start. No compression on one cylinder.
Maybe rings broke or melted while I was riding it. Then once it cooled the gap opened up. Now want pull a vacuum. :dunno:

xjjeepdude · Nov 18, 2014

You have 2 problems. The ski ran lean, Also possible a oil delivery problem. As I look at the pic's I see scoring in both cylinders. If it ran lean, normally you would only see scoring in the one lean cylinder. You will need a top end rebuild, carb clean and flush also I would remove the oil pump and pre-mix the ski. If you are going to keep the ski I would replace the crank seals and remove the crank-case water drain cable. This is normally a real reliable motor, Keep the water out and Keep it oiled and you can see 500 to 600 hrs out of it. I can help you with the parts and the labor. I own a jet ski shop in Knoxville tn.
Thanks
Carl

Eddyj · Nov 19, 2014

Thanks for the info. I'm on a work/business vacation and have a couple of days until I get any time to work.
The oil delivery hose on dry cylinder was split and leaking.
The cylinder that's dry does have some scoring but not terrible. The other cylinder is ok , the pic makes it look worse than it is, I cleaned it after picture was taken No scoring on good cylinder and minimal on dry cylinder.
What are the reasons for no compression? Just fried rings or is there another possible cause I'm not seeing?
Do you have a link to the "oil tank removal" and what's involved. That's sounds good.
a price on top end rebuild. Would you be willing to ship?