• 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 The previous version was outdated and no longer supported.

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    Thanks for your patience and support!

250-500cc GasGas piston in WR 300

I'm on the hunt. Got messages into Wossner, Vertex and Wiseco.
Hopefully one of them has a piston with the same dimensions as the stocker (Vertex #23457), but with a dome.

If not, I'll buy a stock replacement and have the head cut to raise compression.
 
You might take a look at your air boot to box seal and make sure you're not sucking dirt. That sand blasted look on the intake skirt might be a sign.

Just saying. :excuseme:
 
PC.;103399 said:
I saw that too. And he would know.

I'm sure its fine. Just a different skirt design.
I assume the Vertex piston is the same!?!?

Johnny,
can you verify? Did you get it yet?


Also, I tried to measure the squish with the stock piston but the 3/32" rosin core solder was too thin to impact the head. So the stock squish is greater than .094", which is really loose itself. I'll need some thicker solder to get an accurate reading.
Click to expand...

Hello! I think i have to learn to count, because when i checked in my book i had maybe around 55 hours on my piston, and as i use it for some streetriding i don´t use WOT so much, so i think i will wait until i change it. But the Wössner piston looks good:D! 71,945mm in diameter and tefloncoated.

Johnny:sweden:
 
Hi guys!

I dont care too much about more power, squishbands, domed pistons and so on, the bike already scares me sometimes. :thumbsup:

I just need a new piston. Tried to order on yesterday, but the mechanic asked wich size I wanted?? For a WR 300 of course was my answer, but that was not enough.
According to him there is supposed to be two different diameters. He said that there should be a stamped 1 och 2 somewhere on the cylinder. I can´t find that. Does anyone of you know where this stamp is supposed do be located??? In whorst case it can be placed so that you have to remove the cylinder head he said?:banghead:

I dont want to take it apart, measure and then wait for a piston for a few days. I want to ride, change piston some night and go riding again next day....
 
Johnny,
can you post a picture of the intake side of the piston please?

Foggen33,
there's an A, B and C sized piston. A is 71.94mm, B is 71.95mm and C is 71.96mm.
If you remove the head you can see what size piston it currently has.
 
MOTORHEAD;103524 said:
You might take a look at your air boot to box seal and make sure you're not sucking dirt. That sand blasted look on the intake skirt might be a sign.

Just saying. :excuseme:
Click to expand...

If anything it was from the Mikuni sucking dirt before I got the 7602 filter on there. There was always dirt in the carb when I'd pull it.

Although, I think the flash of the camera makes it look worse than it truly is. The intake window wearing a 1/32" ridge into the piston was more worrisome to me.
 
PC.;103599 said:
If anything it was from the Mikuni sucking dirt before I got the 7602 filter on there. There was always dirt in the carb when I'd pull it.
Click to expand...

China Hat valve grinding compound. That stuff kills bikes, pistons, bearing, fork seals.
 
PC.;103598 said:
Johnny,
can you post a picture of the intake side of the piston please?

Foggen33,
there's an A, B and C sized piston. A is 71.94mm, B is 71.95mm and C is 71.96mm.
If you remove the head you can see what size piston it currently has.
Click to expand...

Hello Swedish friend! As i have a few hours left on my piston it will take a while before disassemble it. I don´t know if it makes any special differenc if the piston is 71,94 or 71,95mm as standard when my piston is in between at 71,945mm. Thats 5 thousands! I guess rhey make the piston like that to fit both sizes.
What do you think?

Johnny
 
PC.;103598 said:
Johnny,
can you post a picture of the intake side of the piston please?

Foggen33,
there's an A, B and C sized piston. A is 71.94mm, B is 71.95mm and C is 71.96mm.
If you remove the head you can see what size piston it currently has.
Click to expand...

Thank you!
Exactly what I didn´t want to hear. But there is no other solution then grabbing the tools with a smile on my face..
 
Johnnymannen;103903 said:
Hello Swedish friend! As i have a few hours left on my piston it will take a while before disassemble it. I don´t know if it makes any special differenc if the piston is 71,94 or 71,95mm as standard when my piston is in between at 71,945mm. Thats 5 thousands! I guess rhey make the piston like that to fit both sizes.
What do you think?

Johnny
Click to expand...

I have run my piston approx 100 hours now, very long according to my local mechanic, but most riding have been on gnarly endurotracks with very limited time och full trottle. If it would have been a forged piston I wouldnt have changed befor 150.

I actually don´t have a clue if its true that they make pistons that way, but it wouldn´t be such a wild guess maybe?

Question: Is the head sealed with o-rings or what. Do I need to change anything or can i just lift it off and put it back without risking any leaks if i ride for a couple of hours? This is my first 2-stroke ever so I am not so familiar with them.
 
Foggen33;103909 said:
Question: Is the head sealed with o-rings or what. Do I need to change anything or can i just lift it off and put it back without risking any leaks if i ride for a couple of hours? This is my first 2-stroke ever so I am not so familiar with them.
Click to expand...

0-rings. Real EZ to do. Pop it open and take a look and slap it back on. Should not take more than 45 minutes.
 
Motosportz;103969 said:
0-rings. Real EZ to do. Pop it open and take a look and slap it back on. Should not take more than 45 minutes.
Click to expand...

And remember to drain the coolant first :D

Brandon - With how fast the 300 is stock I can't imagine wanting more, but I am not a power junkie. I hope it does not transform into another big bore YZ :eek:
 
Not really looking for more power. Just want to shift some down low (where I spend more of my timer riding this bike) and less up top. This bikes makes my YZ feel tame on top and the YZ makes this bike feel tame on the bottom.

And I am a self proclaimed power junkie and I cant leave well enough alone. No point lying!

Johnny,
any chance of getting a picture of the intake side of the piston? Please!
 
PC.;104055 said:
Not really looking for more power. Just want to shift some down low (where I spend more of my timer riding this bike) and less up top. This bikes makes my YZ feel tame on top and the YZ makes this bike feel tame on the bottom.

And I am a self proclaimed power junkie and I cant leave well enough alone. No point lying!

Johnny,
any chance of getting a picture of the intake side of the piston? Please!
Click to expand...

I´ll try to post up some pictures as soon as i get my new phone working with my mail! Promise:cheers:!
 
Here´s the box with partnumber and stuff. Hope it´s some help for you!

Johnny:sweden:
 

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Thank you!

The Wossner piston looks like it has a wider skirt on the intake side than the Wiseco. If you have a chance can you drop the piston into the cylinder and see if the skirt is wider than the intake port at its largest opening? Or more simply can the intake skirt fit into the intake port as it passes?

The Wiseco comes to a narrow point and it can fit into the port, which worries me.


Against my better judgment I installed it last night. It turns over just fine and feels great, but that intake skirt makes me nervous. I'm going to run it for a bit and then change it out for a Vertex on an accelerated time frame (assuming the Vertex intake skirt clears the port).

On a positive note the compression is up quite a bit. I can really feel it in the kick starter. And I can actually get a squish measurement with .125" solder. My caliper is a Harbor Freight hunk of junk that only measures down to mm's, but I believe it to be around 1.6-1.7mm's, which puts the squish around .067-.070". Not ideal, but a lot better than .125"+.

Need a new head bolt and exhaust o-ring before buttoning her up, but should have those today and hopefully go for a ride tonight. Will report back.
 
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