• 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 The previous version was outdated and no longer supported.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!

125-200cc Piston interchangeability CR/WR Yamaha YZ 125 2005 onwoards

Miezie666

Miezie666

Husqvarna
Pro Class
Hi there,
i just came across this, i recieved a brand new Piston for my WR which i put next to my YZ 125 Piston- its looks so similar- i m sure it will fit vice versa.
Has anyone tried this before?
 
IMG_20150404_120914.jpg IMG_20150404_120925.jpg
IMG_20150404_120930.jpg

I would say its the Same But the YZ piston has got 2 holes drilled in the skirt to cool down the exhaust bridge.
 
wallybean said:
You will need to machine your head to fit the yz dome. Other than that the yz piston works great.
Click to expand...

The YZ 05- has a flat top piston.
the pre 05 YZ has a dome Piston.
But this one has a small angle around - looks like a "squish area"
 
is the relief area above the wrist pin just for weight reductions or is there any porting to that? looks pretty damn close!
 
The shop that handles my suspension had a earlier wr125 and dropped in a big YZ 150 piston after they punched it.
He said that it was a dead swap as everything fit
 
All the later yz pistons have the bevel to a flat top. The top is raised ~.026" above the top of the Husky piston. If you don't machine your head accordingly the squish will be too tight at the top of the bevel. It will also raise your compression quite a bit. It will want to detonate around the perimeter of the piston because of the trapped gasses that will be at greater pressures than the combustion chamber due to the very small squish at the top of the bevel.

I used the YZ specs for my 165 pistons. I like the piston design. It has a 1mm offset that also helps. It is just a matter of machining your head to get the squish and shape correct. Head machining is cheap and allows you to use the cheaper and more available YZ piston for the rest of the motors life. You will be creating a mirror image of the piston bevel to flat top at the correct squish when you machine the head. I would also consider enlarging the bowl slightly so you don't have any fuel issues with too high of compression.
 
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