seadoo sportster 1800 -99. comp question?

[hedberg]

how much compromissin should it be on each cylinder on a seadoo sportster 1800 -99 whit 2x rotax 85 hp?

 

[Dr Honda]

150 PSI is spec.... 135 psi is the lowest I would call acceptable. (and running)

 

[hedberg]

Problem whit sportster 1800, pleace help

I have a few questions.

i have a seadoo sportster 1800 - 99 whit 2x rotax 85 hp.

how much compromission will i have on each cylinder?

one engine is not as it should, it goes bad when it comes up at higher RPM

problem can be described as the same in this link:

http://www.seadooforum.com/showthread.php?p=75465


so probably it is also gunk in the carburetor?


one engine exhaust stem is a bit brown, someone familiar with this or know why? engine has been hot?

This is a picture of each engine:

http://img684.imageshack.us/i/dsc01798t.jpg/
http://img693.imageshack.us/i/dsc01797y.jpg/

I also need two new impellers to the boat, what should I have to?
where do i buy them? Please send a link

( im new on this whit jetboat)

 

[kustomkarl]

Here is some information on doing a compression test;

Compression Check

You'll need a compression tester. Go to any auto parts store. I think they sell for like $25.00 USD. The compression gage, will screw in the cylinder head in place of the spark plugs. To test compression, remove the 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 gauge, 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 all the 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 then there is a problem. The ratio of difference is 10% difference between cylinder readings.

What do you mean by exhaust stem, exhaust pipes....ok, it might have a cooling problem. Be sure the water lines are open and not clogged.

I would do a compression test first to see what is going on inside the engine. It might be the engine has some internal problems from excessive over heating.


For any parts you need check out our "parts" link at the top for parts you might need.

I hope this helps you.

Karl

 

[Dr Honda]

I have a few questions.

i have a seadoo sportster 1800 - 99 whit 2x rotax 85 hp.

how much compromission will i have on each cylinder?

Did you not read my post at all? It was pretty simple.