• 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 The previous version was outdated and no longer supported.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 WR 250/300 Power Valve adjustment Pictures

raisrx251

raisrx251

Husqvarna
AA Class
First off, I got these pics from someone else on adjusting the power valve. I posted somewhere else and they disappeared from that link.
IMG_0617.jpg

make this tool out of plastic and mark your measurements.

IMG_0618.jpg

Place here

IMG_0621.jpg

measure here

IMG_0622.jpg

adjust here

It's been a very long time since I have done this since I don't have this bike anymore.

CIMG1848-1.jpg

CIMG1847-1.jpg

shameless plug as I always liked this picture of my bike before I owned it. This is the cost of me showing you the adjustment pictures!!
 
YES****************************************

So how do you make the valve adjust down to 50.5mm? When you loosen the bolt under the right hand cover, will the valve become loose?
 
It changes where the power is delivered.

So I went and tackled this little project.

The PV was gross on the right side.
2012-07-18210815.jpg


Removing the head
2012-07-19223300.jpg


Head removed.
2012-07-19224144.jpg


Cleaned the PV adjustment
2012-07-19224732.jpg


Then checked the gap and adjusted to 50.5mm.
2012-07-19230800.jpg


Put it all back together.
2012-07-20191050.jpg


I really hope it makes some sort of improvement. It was pretty easy to do. It can be done with the tank on too.
 
Just for the record, these pics came from a guy a long time ago (I think from TT days). Thinking about it now, I don't think I ever did this to my WR 250. Let us know how it turns out.
 
If the power valve is closed more technically it should give it more bottom but the valve can only open so far before the side ports start closing again, I think the only way the delivery can be changed is with a stiffer/lighter spring or one of those really expensive mods
 
2stroked said:
If the power valve is closed more technically it should give it more bottom but the valve can only open so far before the side ports start closing again, I think the only way the delivery can be changed is with a stiffer/lighter spring or one of those really expensive mods
Click to expand...

Did this to mine ages ago, difference was night and day. Mine was already 50.5 so I tried 48, no response off bottom in comparison but comes on pipe sooner in feel. 50.5 is what makes these things fun in the single
 
So... setting it at 50.5 will make the bottom end more responsive?
My 300 is lazy off idle and I'd like a little more snap. Which setting should it be at?

And thanks for posting this!
 
PC. said:
So... setting it at 50.5 will make the bottom end more responsive?
My 300 is lazy off idle and I'd like a little more snap. Which setting should it be at?

And thanks for posting this!
Click to expand...

Play around with different pilot jets and needles, you can move the power all around
 
2stroked said:
If the power valve is closed more technically it should give it more bottom but the valve can only open so far before the side ports start closing again, I think the only way the delivery can be changed is with a stiffer/lighter spring or one of those really expensive mods
Click to expand...

Since the main flapper can open to the point where the side ports start closing again, should the opening limit be set at the point where the side ports are fully open? Or where the main flapper is fully open (and side ports are partially closing)?
 
PC. said:
So... setting it at 50.5 will make the bottom end more responsive?
My 300 is lazy off idle and I'd like a little more snap. Which setting should it be at?

And thanks for posting this!
Click to expand...


Yes, older 250's recommended 50.5 in manual, newer 48mm.
 
utopia said:
Since the main flapper can open to the point where the side ports start closing again, should the opening limit be set at the point where the side ports are fully open? Or where the main flapper is fully open (and side ports are partially closing)?
Click to expand...


I found the main flapper recedes into the top, so i set it flush which corresponds to side ports being happy too.
 
Quick question just to confirm PV setup. When the PV is fully open, the side ports are also fully open correct? And the opposite , when closed to 50.5, the side ports are fully closed?
 
Does anyone know what the correct position of the little sprocket is?
The power valve axle came off tonight when we were looking for better access to a piston ring, which had a problem during installation.
We can see small dots on the sprockets both sides, but we don't know which position it had.
The dot on the sprocket, with what does it correspond?
Below a copy of the picture that was posted in this topic before, not sure if this the correct position..
Thank you.

2012-07-19224732.jpg
 
deanevo said:
Does anyone know what the correct position of the little sprocket is?
The power valve axle came off tonight when we were looking for better access to a piston ring, which had a problem during installation.
We can see small dots on the sprockets both sides, but we don't know which position it had.
The dot on the sprocket, with what does it correspond?
Below a copy of the picture that was posted in this topic before, not sure if this the correct position..
Thank you.

2012-07-19224732.jpg
Click to expand...
That's my pic. From what I found is NO, it doesn't matter. It spins freely. And now it runs awesome. With the adjustment, it's running with great bottom end power. It has what I've been trying to find. With the Gnarly pipe it's almost too much low end with stock gearing. For faster trails I'll switch to my Doma. I'm very pleased with the change.
 
deanevo said:
Does anyone know what the correct position of the little sprocket is?
The power valve axle came off tonight when we were looking for better access to a piston ring, which had a problem during installation.
We can see small dots on the sprockets both sides, but we don't know which position it had.
The dot on the sprocket, with what does it correspond?
Below a copy of the picture that was posted in this topic before, not sure if this the correct position..
Thank you.

2012-07-19224732.jpg
Click to expand...

There is also a dot on the arm about the third tooth down. Put them so they face each other.
Make sure it is the same as the other side so they both open together.
 
My manual says 50.5 for off-road and 48 for motocross. (50.5 for better low end, 48 for better high end) Mine was set at 48 from factory. When I changed it to 50.5 it did increase low end power a small but noticable amount.
 
So by going to 50.5 you are lowering the lower edge of the power valve making the port smaller and more restricted. In turn delaying the opening of the valve and increasing low end? I'm still a little fuzzy on where to adjust the pv.
 
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