XL700 no power

[dfphoto]

Hello from Melbourne Australia, I have a Yamaha XL700 that I am having problems with. It will rev out nicely on the trailer but under load the ski is sluggish. It will almost stall in a left hand turn and improves again when going right. The compressions are 120 on both cylinders. I have cleaned the carbs, checked the reed valves and inspected the impellor. Any clues, could it be a timing problem. Any advice would be great.

[David3aces]

Re: XL700 no power

Timing is fixed and is non adjustable...compression should be around 150-170...either you have carb problems or compression problems....also check for exhaust leaks

[dfphoto]

Re: XL700 no power

I have two of these skis, both have identical compression, one does it and one doesn't. The only difference I can hear out of the water is the one that plays up sounds just a little bit crisper in the exhaust. Thnaks David

[David3aces]

Re: XL700 no power

run engine for 15 seconds without water...pull plug caps off plugs...are both plugs same temp? perhaps your compression guage is off are these old rental skis?

[dfphoto]

Re: XL700 no power

Problem solved. I think. I removed the flywheel and the stator was loose. In fact the bolts had come right out. I have fitted new bolts and loctited them in. It sounds great. I will let the forum know how it goes in the water.

Thanks

[dank]

Re: XL700 no power

Sounds like one is at the point of running too lean. Open up the high speed adjuster on each carb 1/8 - 1/4 turn and see if things change.