• 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     WR = 2st Enduro & CR = 2st 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 The previous version was outdated and no longer supported.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!

250-500cc Don't mix rings and pistons

Mikey465

Mikey465

Husqvarna
AA Class
I have just had a bad experience fitting new rings to my WR360 and ended up stuffing the piston, rings and barrel coating.
It appears that Husky rings are not the same as Wossner rings. So be very careful what you use together. The size/height of the ring pin in the piston and the matching notch in the rings is different, meaning in my case there was effectively no ring end gap.
I trust that others may learn from my mistake before they fall in the same trap.

The sad and all to credible story follows.
I had to remove and fix the pipe recently, so while the pipe was off I looked up the exhaust port to check the piston and bore. I noticed that the while the piston and bore was in good shape the rings showed noticeable wear. So I got some new husky rings, a new fmf pipe and boyeson reeds to give it a birthday.
I pulled it apart giving the carby a strip and clean while it was off.
I test fit the rings in the barrel to check end gap before fitting them to the cleaned up piston.
The rings fit on the piston like normal and the barrel was fitted over with the usual juggling act.
Bolt it all back together with new gaskets/O rings and then turn it over with the kick start.
It had a little extra resistance but after a few revolutions seemed OK.
Finish by putting it all back together ready for a test run in the morning.

Starting is a bit difficult with the new parts and assembly oil etc not letting it run properly so I have to hold a few revs on until i can adjust the carb. not unexpected.
restart it and try to warm it up but then it just suddenly dies.
go to kick it back into life a she is solid. WTF.
Push it back in the garage and leave it for a minute or two and it turns over again but doesn't feel right.
pull it all back down again and find the rings have expanded and caught in the side transfer ports plus been forced out at the piston pin location to stuff the lot. Not happy.

So the moral of the story is know the piston brand before you buy and fit new rings or just go the extra cost and fit a complete piston kit as it could end up being better and cheaper in the long run.
 
Yep, a pretty basic rule only use matching brand pistons and rings, sorry you had to learn the hard expensive way.
 
Man that sucks i just buy the oem rings yet to do piston
I may go wossner route after 40 or so more hours.
So you didnt check ring end gap?
I read this about a 250 wossner piston kit too the threads
In the cafe husky i think.
 
the story continues...
so I got a new Wossner piston kit and the barrel recoated to suit.
While re-assembling i have checked the ring end gap in the barrel which is OK, as it was last time, but the rings on the piston have not fitted properly around the ring pin again. there was a bit of a bur from the ring pin being pushed so the rings were binding coming up to pin and the notch in the ring was catching the top of pin as well, so it wasn't allowing the ring to close over the pin. i cleaned up both areas to allow proper fit.
I will get to test run it tomorrow to confirm all is OK now, but it could of been a repeat disaster if I hadn't done the extra careful check.
So again, be careful when fitting rings.
 
Sorry to hear it man. I have had zero issues with Wiseco kits and all parts come as a unit in those kits.
 
FYI This latest Wossner kit was a complete set with piston, rings, circlips as normal.
I am thinking it may be a 360 thing as I have never had this problem with any of our other bikes.

With the fixed piston and rings fitted it started and ran fine.
But to be sure I gave 3 heat cycles at home before taking it for a trail ride and finishing running it in.
 
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