• 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 The previous version was outdated and no longer supported.

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    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!

Piston Marks? 73 400 CR

TexasMule

TexasMule

Husqvarna
B Class
Recently received my 73 400 CR (see other post). Pretty sure this is the original
piston, can anyone tell me what the numbers mean. Original bore is 81.50, piston is
marked 8142. Surely someone on this board knows what the numbers mean.....

i-bqXwvSP-XL.jpg
 
8142 is 81.42mm diameter piston. The other marking closer to the center indicates it is the original Mahle piston.

Marty
 
That's strange, the standard bore is 81.50 I haven't seen anything about an 81.42 anywhere. That's what threw me.
 
TexasMule said:
That's strange, the standard bore is 81.50 I haven't seen anything about an 81.42 anywhere. That's what threw me.
Click to expand...

Yup... stock bore on many machines is usually the nominal bore size, like "81.50mm"... Obviously there needs to be clearance between the piston and cylinder so the piston need to be smaller, like "81.42mm"...

If cylinder was exactly 81.50mm, you'd have 0.08mm or just over 0.003" piston clearance. Standard bore sizes sometimes vary a little either way during mass production so often a factory has a few "standard" pistons of slightly different sizes marked maybe 81.41, 81.42, 81.43 so on the assembly line the correct piston can quickly be selected to match the bore and get the clearance right.

On lower production... like a re-bore... the machinist measures the piston and then adjusts the final bore size to obtain the correct clearance... so you don't hear about the way "standard" pistons were sized all that often.
 
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