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 The previous version was outdated and no longer supported.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

Stall, then less compression 86 400XC

Q

Quimo

Husqvarna
B Class
I had the bike out for an afternoon ride in the snow the other day and just as I was coming down the last straight stretch before it was all down hill to the house the bike stalled on me and would not start again. There is a noticeable loss of compression (as measured by how easy it is to kick it over now). I checked the spark plug to make sure it was tight and I took a look into the exhaust and the cylinder and ring look fine from what I can see.

I am guessing I just need to pull the top-end for a full on inspection but thought I would check here to see if I am missing something obvious.

Thank you!
 
Check the flywheel key, 1st, then do a compression test, before you rip her all apart.
I'd pull the pipe off & have a look see in the exhaust port with a light, to see if she broke
a ring, after the key & compression test.
 
had that but worse after a very dusty meeting in dorset on my silver streak , finished race .... checking it over later in pits ... no compression at all ???? left it for 10 mins full compression back and good for rest of season . Can only think ring got stuck like in the castrol r days , but i was running on normal 2 t oil 25:1 !
 
hvaloz2 said:
had that but worse after a very dusty meeting in dorset on my silver streak , finished race .... checking it over later in pits ... no compression at all ???? left it for 10 mins full compression back and good for rest of season . Can only think ring got stuck like in the castrol r days , but i was running on normal 2 t oil 25:1 !
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put this with his riding in the snow and a good point to check if the ring was gummed and stayed in the land
 
Thanks for the advice so far! It looks like I could have some time to work on the bike tomorrow. What sort of readings should I be getting when I run my compression test?
 
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Didn’t get a chance to check compression today but I did check the key. Is this what it should look like?
 
Lucky for me the bike came with some spare ignition parts. I’m guessing though that there is a reason the current ignition was on the bike since none of the other “spare parts” have been very functional.

I recall seeing some threads on how to test these systems so will give that a go. Are there still folks repairing these units?
 

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Quimo said:
Lucky for me the bike came with some spare ignition parts. I’m guessing though that there is a reason the current ignition was on the bike since none of the other “spare parts” have been very functional.

I recall seeing some threads on how to test these systems so will give that a go. Are there still folks repairing these units?
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did the outer part of the magneto, the flywheel, come with that?
the two parts should have the same number, the were matched at the factory, then drilled to index timing
 
2premo said:
did the outer part of the magneto, the flywheel, come with that?
the two parts should have the same number, the were matched at the factory, then drilled to index timing
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It did come with the external flywheel and the backing plate, but I don’t see anything that resembles any matching numbers. The flywheel has a six digit number and the only thing I can identify on the other is a “361”, which doesn’t appear on the flywheel anywhere. The plastic is pretty scuffed over though and it’s hard to make out much. I have the ignition that’s on the bike apart and will check that for numbers.

Thank you Vinskord for the link!

Thank you for the
 
Did a compression test today and only getting about 60 psi. Nothing looks out of the ordinary from the exhaust port. Will pull the top end and have a look.
 
Quimo said:
Did a compression test today and only getting about 60 psi. Nothing looks out of the ordinary from the exhaust port. Will pull the top end and have a look.
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Yes, if you getting only 60PSI, something broke & time to pull it apart.

I'm betting the piston skirt broke
 
Looks like the cylinder and piston got too comfortable with each other and welded the piston ring in place, hence the lack of compression. It was previously bored over twice (83.5). Looking for advice on whether I should go another bore over or try and find a cylinder that has not been bored and start with that. Any thoughts are appreciated.
 

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That's pretty rough, get a machine shop to bore it out some and see where it cleans up.
There is larger pistons, you will end up with, close to a 430.
I have a pile of cylinders if you like less vibration from a 400, small bore again.
 
Quimo said:
Looks like the cylinder and piston got too comfortable with each other and welded the piston ring in place, hence the lack of compression. It was previously bored over twice (83.5). Looking for advice on whether I should go another bore over or try and find a cylinder that has not been bored and start with that. Any thoughts are appreciated.
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is that aluminum on the cylinder wall or gouges?if aluminum see if it can be removed
been down this road years ago and my cylinder was usable
 
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