• 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 4st Cross

  • 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.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

Low compression

S

Sven

Husqvarna
C Class
Hi

Bike won't start.

Carried out a compression test and its really low. Only 35 psi?!?!?

Removed head to inspect valve etc. all ok

valve timing spot on.

Bore in cylinder looks like new and piston looks great.

What ELSE could it be??

TE250 06
 
Did you check compression after adding a squirt of oil in the cyl? fuel can wash down cyl. walls and cause little to zero compression. When you say piston looks great are you looking at the top or do you have it apart and looking at rings and ring grooves? Will the valves hold solvent in the ports when closed? If it's together apply air in the cyl at top dead center compression stroke and the leakage will point you to the problem.
 
Indeed I think a leak test is in order. Ring appears OK, valves tested as you describe. Only thing left is head gasket but surely it cant be letting by that much? What about the AUTO decompressor, if its staying across and not sliding over under the spinning action could this cause it?
 
I've been told that you cannot do a traditional compression test on a bike that has an automatic decompressor, you have to do a leakdown test instead, unless you can deactivate the decompressor and then, on my 450, I've been told that I risk damage to the engine if I crank the bike with no decompressor or if the valves are loose enough to deactivate the decompressor.
 
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