• 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 The previous version was outdated and no longer supported.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!

Oversize piston?

tonskiguy

tonskiguy

Husqvarna
AA Class
Has anyone actually replaced a stock piston with an oversize in the 511or 449? If so, did you have to replate the cylinder bore? What piston to cylinder clearance did you shoot for? I know what the manual says, but that seems very tight.
 
Normal cylinder to piston clearance is 0.06...0.08mm (in diameter). Piston rings gap is 0.4mm.
 
Most modern bikes use a plated cylinder. You would have to bore it out (if there is enough material to do so) then re-plate it to size. Other option is to steel sleeve the cylinder (LA Sleeve) to whatever size you want (within limits). Sleeves don't need plating and you can bore them out multiple times. I am not a Husky expert but this is the standard practice on other bikes.
 
I appreciate the comments, but what I'm really after is, did anyone ever do it? I've read the manual, and I am aware of the printed specs. .06mm is like .002", that seams very tight to me. I'd like to know that that is not a misprint. If someone has measured and installed a piston with a bore clearance of .06 - .08 mm in a TE449 or 511, and had success, without siezing, I'd like to hear about it.
I have a local machine shop tht will plate the bore to whatever size i want, so, I just want to be sure. Thanks!
 
If someone has measured and installed a piston with a bore clearance of .06 - .08 mm in a TE449 or 511, and had success, without siezing, I'd like to hear about it.
Click to expand...
If the cylinder in dimension tolerances (A, B), have a hone, without scratches, then do it and enjoy riding. :)
 
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