2000 gtx compression ?? and other ??'s

[seadoogti7]

I am looking at a 2000 gtx to purchase. I ran a compression test and found that both cylinders are at 120 and 121. Is that good or bad? What is the lowest until it would need a rebuild? It fires right up and sounds good. Also what else should i look for before i buy it? How hard is it to do a top end? Does the motor need to come out? Also my final ? is if it does not say direct injection then does it have carbs? Thanks

 

[derek]

hi 120 and 121 are ok. not fabulous, but ok. probly get a couple more seasons. lowest acceptable is 100 if they are the same in both holes. and that is acceptable to run, not to buy as good.

 

[kustomkarl]

Here is a link to buying a used seadoo; http://www.seadooforum.com/showthread.php?t=134

Also here is some information to do a compression correctly;
To test compression, remove both spark plugs. Place spark plug caps on the plug cap studs near the cylinder head to ground the empty caps. This completes the circuit of the ignition electrical system and prevents any electrical problems from the caps being un grounded. Using the correct adapter for the threaded end of the tester,( same length of the spark plug threads length)Screw in the tester in one plug hole. Hold the throttle wide open. Push the start button. Watch the compression guage, when it peaks out at the most compression, let go the start button. Read the psi number. I would do it 3 times to be sure it is accurate. Check both cylinders the same way. The ideal compression is 150 psi per cylinder. If it is less, it's not a problem as long as they are close to being the same. If the psi is less than 90 it might need be time for a tear down and a rebuild. If the psi in 1 cylinder is say 140 psi and the other is 80 psi you need to tear down and repair. This difference is a lot and there is a problem. I hope this helps you.
Karl