• 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.

    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 The previous version was outdated and no longer supported.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!

Ring end gap 500 air cooled

B

Bart

Husqvarna
AA Class
How much ring end gap should I have on a freshly bored 87,42 air cooled cylinder.
I'm thinking about 0,6mm it's 0,5mm right now.
 
Hi Bart.

That sounds a little on the tight side. Before you file it to 0.7, check that you have at least 0.08m/m clearance between the piston and bore. I am wondering if it has been bored too tight and the small ring gap may reflect this? If in doubt, get it honed out a bit, as when a bore is worn it is usually by a lot more than 0.01 / 0.02 ! Better a bit slack than a siezure!

Andy.
 
I am now boring my cylinders out larger to .004 on 430s and 500s In hot Texas I just need the extra clearance

Really if you look at Husky spec sheets - that is what they have listed.
 
I've got an 84 500 that seized after a rebore and new wossner-it should have been bored to wossner spec 0,08mm clearance for a 87.42 piston. Is this the clearance ok?
I'm measuring 87.47 at the top of the bore in 4 axis, 87.5-87.53 mid stroke and 87.53-87.6 at the bottom. I'm not sure where the spec 87.42 is measured on the piston ,I'm assuming they are manufactured not perfectly round or parallel as my piston measurements have a range of 0.15 mm variation .
The bottom line is I've investigated the possible causes of the seizure and haven't n discovered anything positive , I'm wondering if the piston bore clearance is tight in spots or the wossner spec is too right ? Any thoughts? I did post a thread on possible causes a few weeks ago, but this question is specifically about the clearance on a 500 aircooled wossner piston.
Ring end gap is 0.46mm
 
gday, have you done a plug reading to determine if the engine may be running to lean? The other thing that comes to mind is allowing a proper break in before hammering it. Theres nothing more fun than seeing how well that new bore job will run by opening it up for long periods. I know I've been there. :eek:
 
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