• 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.

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Wossner 360 piston installation

ruwfo

ruwfo

Administrator
Staff member
Ok, I got the 360 cylinder bored & new Wossner piston, & 2 questions arose.

1) Rings don't look to have a direction, like Wiesco do, so i installed them with size numbers up (towards dome) is that correct?

2) Also looked at the old parts & noticed the original piston used rod spacers, i didn't use them on the Wossner piston is that right? I got a piston kit from Philip (husqvarna-parts.com) ,which had
new wrist pin, bearing & clips , but no rod spacers so i installed it without them. Is that right?
before i completely button it up

Husky John
 
I pulled the top off again & differently no pistons spacers, as the Wossner is post machined & the rod opening is alot smaller then the stock piston.
 
did you notice a big weight difference? both wossner i have purchased (a third i installed) were way lighter than the vertex or mahle they replaced. they look like a great unit
 
The spacers job is to center the connecting rod on the crankshaft so that the rod doesn't rub the crank halves. I installed a wossner piston in my 74 mag 250 and was able to use the spacers, maybe your piston is machined differently, either way the rod cannot be loose so that it can float side to side.
 
did you notice a big weight difference? both wossner i have purchased (a third i installed) were way lighter than the vertex or mahle they replaced. they look like a great unit

The Wossner felt lighter & looked like a nice piston, much better then the Wiseco. I've used them before & haven't had any problems.

The spacers job is to center the connecting rod on the crankshaft so that the rod doesn't rub the crank halves. I installed a wossner piston in my 74 mag 250 and was able to use the spacers, maybe your piston is machined differently, either way the rod cannot be loose so that it can float side to side.

I've found most big bore Husky don't use the piston spacers, like there 250 counterparts , but I'd guess
it all depends on the brand. The Piston open was approximately .25 different between the stock & Wossner piston
so that's why the piston kit didn't supply new ones.
 
The main thing to realize how Husqvarna controls the side to side location of the con rod. Other mfgs control the location at the crank cheek. This is called crank driven. Husqvarna allows the rod to float at the crank but controls the movement with the location of the piston. This is piston driven. Most replacement piston have this considered in the inside interface inside the piston at the wrist pin end. Most have eliminated the need for the centering spacers that Husqvarna used with the OEM Mahle pistons
 
The piston spacers will not fit the 360 / 390 or 400lc.

It seems to be ok not to use any, as this is how the 400 lc was - but do use a 25mm long small end bearing.

The up-side of doing this is that the small end gets more lubrication which in my opinion is a good thing...

Not everyone is going to agree with this, but I think it is OK.

Andy
 
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