compression

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    Compression Help

    I have a 1997 Seadoo GTS with a 717 engine: So i was having some problems with my jetski and I took the top end apart and found that my PTO piston Rings had a little rust on them so I replaced the ring and then put a new gasket kit on the top end the only thing I didn't do was have the walls...
  2. A

    787 piston ring replacement

    okay waterdogs i need help. my gsx has no compression on the front cyl and i need some tips to replace the rings. do i need to take out the motor (787)? and how can i block the faulty oil pump that caused this? any pictures would be very helpful...thanks guys
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    1997 GTX Differernt Compression Readings 150 vs 180

    I have a 97 GTX in the shop to replace fuel lines but before the guy got started he check compression and found that one cylinder read about 150 while the other was very high at 180. What could cause this? Is it bad? The PWC has not been used yet this season. Any suggestions? The guy is...
  4. M

    Buying a 1998 Speedster - Question about Compression of the engines

    Hi, I am new to the forum and I am looking into buying a 1998 Speedster with twin 110 hp engines. The previous owner says "Had a compression test done last year the left engine has lost 2 hp from factory the other checks out perfect no power loss". When I went and looked at the boat, he...
  5. M

    2000 Seadoo GTX Milenium Edition Low Compresssion

    After riding for a little while my seadoo ran real rough and died. I tried to start it again and it just clicked and didn't turn over. Got towed home and checked the battery. Charged it for a while and it still had the same problem. I manually turned the shaft on the back of the engine and at...
  6. L

    787 Acceptable Rebuild Compression

    I have a 96 787 that I rebuilt top and bottom. I first built the motor with the same 82.25mm cylinder jugs (re-honed) and new pistons, rings, pins, bearings, & crank. I got about 5hrs into the break-in and I found compression was only 125/140. It ran ok, but I figured I would repair the...
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    new 98 challenger 1800 owner with ?'s

    Hello guys, I have been looking over this site for a bit now to learn a little more before buying a jet boat. There is tons of great info on here!!!!! Awesome. Now I just picked up a 98 challenger 1800 and took it to the marina to go over before I give up the rest of the money for this...
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