Just getting ready to put my 89 Waverunner 500 for the winter. It has been running ok. Starts fine. I just ran a compression check. Both cylinders showed about 122 psi. Think I need to have a little work done on it. How far should I go. Can I expect better performance after improving compression. Thanks.
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Re: compression
At what point(psi) would you say I need to do some engine work.
OK. Neither of the manuals I have specify a range. They both state that the factory compression is 142.2. .2, that's funny. :p I hadn't noticed that before. Who measures compression down to tenths? Yamaha I guess. In any case, if you get 122 in both cylinders, you're good to go.
As to how low before the engine would need a top-end job, neither of the manuals I have mentioned that, which seems kind of strange. Maybe someone else here has a good idea about that.Last edited by wmsky; 09-20-2005, 11:21 PM.
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Re: compression
You are fine at 122 psi on both. Believe it or not that engine is a very reliable and will last a very long time if maintained. It is actually a Yamaha 25hp outboard engine turned sideways and modified for PWC application. There are still many of them on the water. That should say something.WATERCRAFT SERVICES. PROVIDING THE RESIDENTS OF HOUSTON AND SURROUNDING AREAS WITH QUALITY WORK ON THEIR PWC AT A FAIR PRICE.
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