• 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 The previous version was outdated and no longer supported.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 urgent help needed please, WR300 seized

I run mine at 45 mph on the roads for short periods (a mile or two) all the time, no concerns. 68 mph is a LOT of revs, though. Combine the speed with a cold motor and possibly lean jetting, and boom!
 
Kyle Tarry said:
Hey, if you buy a new bike, how much do you want for your WR that's all blowed up? ;)
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Leo might buy it. Engine is in the shop already and I spent all day today going through every bolt and cleaning all up to original shine :)
 
ks9mm said:
I was not just open, I got up to speed, rolled off and on and bam..

It's just 2 mile stretch of open road, I've done it before on hot bike no issues.

Oh well..sucks to be me right now...long weekend and no bike
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Isn't this a known way of seizing a 2t engine? REV it out hard and blip the throttle while the engine is still at high RPMs?

--
I'd just drink beer if I was you and at home ... Good luck with your chosen path.
 
Kyle Tarry said:
I run mine at 45 mph on the roads for short periods (a mile or two) all the time, no concerns. 68 mph is a LOT of revs, though. Combine the speed with a cold motor and possibly lean jetting, and boom!
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45 seems to be the threshold speed on my street legal KDX200, too. I can run it for a long time at that constant speed on the pavement....20-30 miles at a stretch without blowing it up.:thumbsup:
 
Sure, but a KDX will run a 50 mph nearly forever, even if you forget to put premix in it and drain all the oil out of the gearbox. :lol: Those things have got to be one of the toughest bikes ever made. I had one and I miss it sometimes!
 
The Carb experts need to correct me here... When you have the bike running down the road at a good clip of speed and your roll off the throttle and coast, the carb drops back down to the pilot jet (off the main jet). If the bike is at all lean it will be SUPER LEAN when you do a quick deceleration. This is when most bikes seize up. So, I'm not sure the whole engine temp was your problem. IMO, the bike was too lean and your fuel mix should be closer to 40:1.
 
Yeah, the throttle lift problem can happen in lots of scenarios on a 2-stroke. For example, on long descents if you have the throttle closed under engine braking. It's not so much being lean that's the problem, but since the top end lubircation comes in with the fuel, being lean also means being light on oil. In theory it could also happen slowing down from a high speed with the throttle closed. I try to blip my throttle in these scenarios, but a short decel or a smaller hill shouldn't be an issue.

Based on where on the piston it's worn ("4 corners"), I think that indicates a thermal mismatch. The high revs and possible lean condition only make that situation worse.

For what it's worth, according to gearing commander (http://www.gearingcommander.com/), on stock gearing 60 mph in 5th is like 7500 rpm. :eek: That's a whole lot of revs on a cool engine at light, constant throttle.
 
At 60 mph the engine is definitely revving pretty hard. On top of that it doesn't take much throttle to keep it there. Less throttle less oil, and at 50:1 you've all but eliminated the safety net.. Don't be silly mix it at 40:1 or more. I consider the 50:1 advertising a marketing gimmick.. Would like to see a pic of the bottom side of the piston crown. If it's black or has a dark spot, it got to hot. When this happens you have even less oil getting to the top end because it gets burned to the underside of the piston crown. This is where that safety net would be usefull.!!
 
Jhunter said:
Here's a great video from Jeff Slavens about lean jetting. At the 4:30 mark he talks about 'cutting the throttle' after a fast run and how a lean condition will blow a motor very easily.
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Didn't know about Slavens method for motor warm up. Makes sense that you get less spooge that way. Got to be careful tho.
 
For what its worth, Jeff Slavens has a ton of 'How To' videos on YouTube. He speaks mostly to KTM but on a 2-Stroke the same concept carries over as is the case of the 'carb jetting'. Just FYI :thumbsup:
 
ks9mm said:
I was not just open, I got up to speed, rolled off and on and bam..
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Yep thats when it happens. High RPM and no gas/oil with chopped throttle. That is a very typical issue. also you compounded it with your "I hit 68mph on 1:35 in to the ride" oh well, fix it and move on. Life is to short to kick yourself over it. Lesson learned. Good luck.
 
Kyle Tarry said:
Yeah, the throttle lift problem can happen in lots of scenarios on a 2-stroke. For example, on long descents if you have the throttle closed under engine braking. It's not so much being lean that's the problem, but since the top end lubircation comes in with the fuel, being lean also means being light on oil. In theory it could also happen slowing down from a high speed with the throttle closed. I try to blip my throttle in these scenarios, but a short decel or a smaller hill shouldn't be an issue.

Based on where on the piston it's worn ("4 corners"), I think that indicates a thermal mismatch. The high revs and possible lean condition only make that situation worse.

For what it's worth, according to gearing commander (http://www.gearingcommander.com/), on stock gearing 60 mph in 5th is like 7500 rpm. :eek: That's a whole lot of revs on a cool engine at light, constant throttle.
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will having a rekluse auto clutch help to prevent the throttle lift problems as it free rolls a bit when i roll off
 
my understanding is that it only engages when power is applied, when power is not feeding the clutch, it's freewheeling.

there is small amount of clutch drag, but thats about it.

I do not think my engine locked up though when it seized.
 
ks9mm said:
my understanding is that it only engages when power is applied, when power is not feeding the clutch, it's freewheeling.

there is small amount of clutch drag, but thats about it.

I do not think my engine locked up though when it seized.
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Like Kyle says it should lock up on decel.
 
The Rekluse is a centrifugal clutch, meaning it engages based on engine speed. It shouldn't care if power is applied or not, just speed.
 
donno.. maybe it's just 2 stroke effect.

all i know is that when engine quit, i pulled the clutch in and coasted to stop. but my rear wheel did not try to lock up.
 
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