• Husqvarna Motorcycles Made In Sweden - About 1988 and older

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

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    Thanks for your patience and support!

XC 500 compression

G

greenstreak

Husqvarna
C Class
I just got a 1985 XC 500 and did a compression test on it. I can not find a range where it should fall in. Anyone have a clue to where I can find a reference to check it against? Compression on my cylinder is 127 PSI.
 
Did you do the compression test with some oil in the cylinder?

127psi is on the low side, should be 150, but remember the later 500's
had lower compression ratio then the even the 430 .

Here's a article on how to do compression tests & good ref repair site

http://www.dansmc.com/compression_test.htm


Husky John
 
Good link John, maybe they can pin that to the tech section. I always pull the slide out when checking comp. That way I dont have to hold it wide open. 125psi with a 500 @ 9.5-1comp might not be too bad. I freshen up my 250's @ 125psi but they have 12-1 compression, freshened up 180-160 psi. Another factor is the kicking speed which is going to be slower on the big bores. Higher cylinder pressures also help ring seal by forcing ring to the cylinder wall. Have you pulled the pipe and carb/reeds to look at cylinder?
 
I did a proper compression test with throttle wide open and kicked hard 10 times. All my references I have are for Japanese engines, and their 2 stroke singles.
Does anyone know how or where I can get an official reference? I have a Husqvarna CD that I got off of E Bay, but it does not list the compression range.
If I need a set of rings, where is a good place to buy them? The guy I got the bike from thinks it is a factory piston and not a Wiseco.
 
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