• 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.

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250-500cc Cylinder Wear - Run It or Replate It?

Kyle Tarry

Kyle Tarry

Husqvarna
Pro Class
2012 WR300, about 175 hours of trialriding and enduro/scramble racing. First top end change, and there is a wear area under the exhaust port that has me conflicted. Pictures:

IMG_20141207_111626_838.jpg


IMG_20141207_111344_357.jpg


The wear is below the TDC ring position. You can pick it up with a fingernail or a feeler gauge, barely.

Here is the piston, just for reference, it will be replaced:

IMG_20141207_111513_762.jpg


What do you guys think? Can I clean it up and run it, or does it need to be plated?
 
Is it raised or scored? Personally i would run it i would use a second cut file and take that to piston skirt, new rings stick a small end bearing in and slam that together.
I am a gash b#stard tho.
 
I've seen some cylinders that look bad but after scotch-brite and PB Blaster penetrating oil the scuff turned out to be all metal transfer from the piston and no damage to the plating. I recommend checking it with a dial bore after you have cleaned it... the dial bore won't lie.
 
Just a thought, but the compression comes from on top of the ports, which look pretty good. I've had good luck in the past removing the piston aluminum from the little KX cylinders with muratic acid, and you'd never know the darned things seized. (max big bore overheating, darned superminis)
 
Thanks everyone. The cylinder is mint perfect everywhere else. I think I am going to run it. Scotchbrite cleaned it up a good bit, there is still a tiny bit of grooving/scoring in that area but you are hard pressed to feel it with your nail, you can pick it up with the edge of a feeler gauge.

I am putting a brand new piston in the bike in any case, so the old one is a paperweight. I think with no raised area, the skirt should be perfectly happy down there.

We'll see how it looks after some more hours.
 
I would run the old piston too but hay thats me, good call the scorings vertical and minor i knew a guy who raced tz's he would un seize the motor file ofending skirt an swich the ring upside down to run again for second race. Flipping mental bloke i miss him.
Keep new piston for new lining..
 
Nothing wrong with that barrel as long as you have removed all traces of transfer.
 
that not to bad at all the piston is clean below the ring rub it down with a scotch brite pad check your ring end gap [ mite mite need those b4 long why did you even take it apart?
 
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