• 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 The previous version was outdated and no longer supported.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 Wr300 Cutting Out And Getting Hot

Lincolnlock

Lincolnlock

Husqvarna
AA Class
Well, my 2010 WR300 burned up a piston and cylinder after I couldn't keep enough water in it to keep it cool. It was cutting out at higher rpms on long climbs in the mountains. I finally got the engine back together with a new cylinder and piston. The bike starts easy, and seems to run really good except the fact it gets hot, and cuts out. I have completely moved the jetting from rich to lean with the same cutting out and heat issues. Also, I looked at the reeds and they seemed fine as well. Has anyone had any issues with the ignition timing moving around and causing issues? I'm at my wits end with this thing so any ideas will help.
 
Lincolnlock said:
Well, my 2010 WR300 burned up a piston and cylinder after I couldn't keep enough water in it to keep it cool. It was cutting out at higher rpms on long climbs in the mountains. I finally got the engine back together with a new cylinder and piston. The bike starts easy, and seems to run really good except the fact it gets hot, and cuts out. I have completely moved the jetting from rich to lean with the same cutting out and heat issues. Also, I looked at the reeds and they seemed fine as well. Has anyone had any issues with the ignition timing moving around and causing issues? I'm at my wits end with this thing so any ideas will help.
Click to expand...
Have you checked for a fuel supply problem to the carb? Possible pet-cock filter plugged or gas tank vent problem? Either of these will cause a lean/ over-heating condition due to fuel starvation.Good luck and hope you find the problem.
 
Check for combustion gasses getting past the head "O" rings or head. This will cause the radiator to instantly build pressure before the coolant is warm and can get water in the cylinder and cause cutting out. Plus gasses will get in the water jackets and prevent heat transfer due to air pockets and cause further overheating problems. I would start the bike cold and rev it a few times and then immediately shut it off. Then as you loosen the radiator cap listen for escaping pressure.(there should be no pressure because the engine has not had time to warm the water) Now as a second check re-start the engine with the rad cap off and look for small bubbles in the coolant as it circulates. I realize you just put new gaskets and "O"rings on but there might be a crack, casting flaw or warpage letting pressure by. The leakage could also be in the cylinder itself but much less likely.
 
Checked the radiator. Sure enough, there are a ton of bubbles. There is some crummy machining on the top of the cylinder from the factory. It's to bad I just spent $300 having the cylinder repaired. This repair just got REALLY expensive. Thanks for your help troubleshooting this guys.
 
Be sure to check the coolant channels in the cilinder, there was a batch that hadn't drilled a coolant channel that prevented water from flowing.
There's a vid on Youtube about it.
 
What year bikes had the non drilled coolant channels? Or is this an ongoing problem? I was running hot and boiled over on the last ride and when I put my Hi-comp Head on the stock coolant looked "Burnt" and it only had about 5 hrs on it?
 
Lincolnlock said:
Well, my 2010 WR300 burned up a piston and cylinder after I couldn't keep enough water in it to keep it cool. It was cutting out at higher rpms on long climbs in the mountains. I finally got the engine back together with a new cylinder and piston. The bike starts easy, and seems to run really good except the fact it gets hot, and cuts out. I have completely moved the jetting from rich to lean with the same cutting out and heat issues. Also, I looked at the reeds and they seemed fine as well. Has anyone had any issues with the ignition timing moving around and causing issues? I'm at my wits end with this thing so any ideas will help.
Click to expand...
a faulty ignition can cause engine failures/seizures.check the spark.my 2012 WR300 had a faulty stator that caused an erratic spark.good spark,weak spark,no spark etc etc
 
I found that the screen in the spark arestor was plugging up at higher engine loads by a piece of the packing. That is the last screen type muffler I will ever buy.
 
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