• 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 The previous version was outdated and no longer supported.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 Shattered piston on my '11 wr300

I don't understand why you guys go so many hours on a piston.... Super cheap to throw and piston kit in and be good to go.... keep it under a 100 for aftermarket
 
racemx904 said:
I don't understand why you guys go so many hours on a piston.... Super cheap to throw and piston kit in and be good to go.... keep it under a 100 for aftermarket
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Not sure where I could get a piston for the 300 under around 150. Then there's the gaskets and o-rings, too. The only bike I own that I can find an aftermarket piston kit for under a hundred dollars is my KDX 200.
 
Oldscool said:
I think he meant under 100 hrs not dollars.
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Oh. Well, I still like to get all the mileage I safely can out of a top end. And I think it costs enough to think like that. Now if I raced hard and all season long, I'd follow a tight schedule for rebuilding.
 
No excuses here. I check compression every couple of months so thought I was ok until I decided to pull the reeds off to inspect the intake side. Lesson learned is that compression can be fine past 100 to 200 hours, but the piston will still be wearing on the intake side. Still waiting for my relined cylinder and wossner piston kit from Millennium Technologies. Should be here next week. Also ponied up for some porting and head work from them just to see what it will do. I also replaced the main crank bearings and seals (thanks Rancher1!) and flushed the bottom end a dozen times w/kerosene. Lots of tiny piston fragments showed up in the first few flushings so kept at it until no more were detected, then did a few more for good measure.

Only upside to waiting 3-4 weeks for a relined cylinder is it gives you/me lots of time to inspect everything else. So far I've replaced the linkage and swingarm bearings; installed new seals, wipers, and inner and outer bushings on the forks (Yamaha yz/wr factory kit for 48 mm kyabas) along w/new oil; serviced the shock w/new oil, adjusted the carb and installed a new float valve in hopes of better mileage (the original float valve was worn around the seat ever so slightly upon very close inspection); new f&r sbs brake pads, new fmf gnarly and TC2, new plastic, new seat, new tires, new grips. I think that's the thick of it... New graphics and foot pegs soon.
 
shawbagga said:
Powerseal sposed to be good. Dunno where they located. 300 hours not a bad innings for the bottom end anyway-think of it as preventative maintenance(make ya feel better?:))
Click to expand...

PowerSeal is a little north of Philadelphia. I used them and will be bring the kids 144 jug there next week.
 
I meant 100 hours or every season even play riding... Better to spend $200 then go 3 years and waste a crank, cylinder and piston....

Compression is not a great measure.... You can have great compression yet a piston that's wore out and ready to break the skirt off and grenade your motor...

Personally on OEM stuff I throw rings in at 50 hrs and while kit at 100
 
Been play riding for a couple years on my 12 wr300. I started to pick up ths pace and do some riding at race pace. Noticed the bike was easier to kick and losing bottom end grunt. Top end felt fine but figured it was time to do the piston and rings. I started up the WR to warm up trans fluid to change and started to get that surge/running out of gas thing. Shut er down and broke her down and sho 'nuff had the "death smile" on the piston from the intake port.
Got a vertex piston kit off ebay for 119 and a full athena gasket kit for 50. I figured might as well get some extras.

Put it back together and fired it up and yep it was time. Feels solid and tight. I did 2 heat cycles and doing woods ride tomorrow.
Feels tighter now but I can really tell it's muffler packing time...

Did all that work and right when I was ready to clean up, my kickstand cam breaks... Jeez....
 
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