• 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 The previous version was outdated and no longer supported.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 Power valve balls

jeanjean

jeanjean

Husqvarna
AA Class
Hello everybody,

first I'd like to present myself: I'm French (I apologize for my poor english) and new owner of one of the last italian WR 125.

I've already readen a lot over this bike in the present forum, especially about carburator and power valve settings.

Concerning the power valve, I assume the quite expensive provini damper is probably the best way to improve the response of the valve, because it doesn't affect the revolution speed, at which the valves opens, but the velocity of the opening movement.
Unfortunaltely, the provini damper seems to be not available for the 125, but only for the 250-300.

In the french forum http://husqy.forumsactifs.com, I reeds about guys changing the size of the ball (from 8,7 mm to 7,9 mm (1/32 inch)).
Did someone of you already try this or something similar?

Regards,

Jean
 
If your newly registered no you cannot edit your first few posts. the moderator will step in.

Welcome jeanjean whats the issue with the current setup?
You want the power to kick in sooner? Yes heavyer ballbearings in the power valve actuator will do that.
 
If it uses ball bearings to actuate the power valve in theory yes but heavyer balls are required so tungsten instead of steel etc. think its tungsten similar to heavyer ones used in rekluse clutch.
 
An extra spring can be added to existing larger power valve spring - this is the Walt (wallybean) designed kit available from Halls - I believe .

A small silver spring was from memory what I used in the past which raised the point( revs ) of the opening of the power valve to increase torque - smoothness.

I would do this again for a 125 - I think it was a good mod .

Not sure on spring spec.s - it may be possible to just buy one spring locally
 
Hello everybody,

I submit the question only to satisfy my curiosity...
I've seen all the threads over the spring solution, was just surprised that nobody try the ball solution.

Although changing the balls size would probably affect both the rpm at which the valves open and the tpm when fully open.
This is the same with an additional spring acting from the beginning, that is to say adding some preload or at least from the same lengh as the original spring.

Showing the graphs published by MattR, I assume that the small silver spring is a bit shorter than the original spring and don't act from the beginning, but with some delay to extend the opening range of the valves.

Regards,

jeanjean
 
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