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Discussion Starter · #1 ·
I have a 1989 js 550 bought from original owner it's in great condition nothing has ever been apart on it.I've had it for 3 yrs it's been running great.In an effort for a little more power I added a R&R pipe. It's seems slower now(put in on over the winter)than when I put it away.Tried differant route with the hoses(water box bypass) no real change. I was wondering if I should have made other changes along with the pipe?Maybe the rings are just weak,what is a good compression,again engine has never been apart.Thanks in advance for any help
 

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Discussion Starter · #3 ·
The thought of putting old exhaust on has crossed my mind, i'm just being kind of lazy.
I will need to get gaskets to do that etc... I will check compression air leaks is someplace I should look,do you know of a way to test those crank seals?
 

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so..... if you are being kinda lazy.....then .....there is your problem.
crank seals are checked by blocking off all holes and filling the crank with air 15psi only!!!!! use a regulator to do this. use a plate with a valve stem to block off the intake.

nothing will happen till you get off your [email protected]@



ps you dont need gaskets...black rtv will work.
 
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