• 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 The previous version was outdated and no longer supported.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 Milling cyl/head cr125

H

huskylove

Husqvarna
Pro Class
I got my bike torn down just to get the head powdercoated for cosmetics, and I was wondering if anyone knows offhand how much I could get away with milling from the cyl to get more compression?

I would not want to mill the head because the o-rings will make it tough. I am not a machinist but I do have acess to a mill so I could get it done easy enough.

Milling the cyl base will lower the intake/exh ports that about which will probably cause the peak rpm to lower right? So to fix that you would then raise the ports slightly?

I know I should just let a pro do it, but I am mechanically inclined and its sitting on the bench so give me some tips! It ran great previously with only problems idling in gear for more than 10 seconds (starts dieing down), but that was likely an adjustment to be made.
 
I would be inclined to look at improving the compression but leaving the ports alone - its a 125 so it should scream pretty hard.
You would need to get some squish band readings with the cylinder on the bike . From memory mine was around 1.25 mm and I reduced it to around 1.00 by just having the head shaved only . Taking material out of the head is when it gets more technical and is better to prevent detonation . Id send the head out to these guys http://www.rb-designs.com/ - with some solder test results
 
Thanks for the tip, I knkow a bit about the squish but milling the head will be quite hard (for me) as I will then have to cut the o-ring grooves down more right?

That sounds really like a pita!
 
We still have Ty's procircuit cr125 race bike in the shop. I wouldn't surface the head, if you wish more power, we have and can port the cr125. We usually run less compression and reshape the combustion chamber to burn fuel more efficiently.
 
does porting them lose some low end ?
If you start going all out its better value to get a spare 144 kit ? unless you are really into 125s or get a later model 5 port 125 cylinder
I didn't get the orings cut down but the orings did get stretched by additional heat
 
rockdancer said:
does porting them lose some low end ?
If you start going all out its better value to get a spare 144 kit ? unless you are really into 125s or get a later model 5 port 125 cylinder
I didn't get the orings cut down but the orings did get stretched by additional heat
Click to expand...
Depends on how we port it. But no, not necessarily. O-ring is on the cylinder so you can cut the head on a lathe. If you aren't racing and/or tied to 125cc, the 144 kit is the way to go, possibly 144/port/polish, etc. :)
 
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