• Husqvarna Motorcycles Made In Sweden - About 1988 and older

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 The previous version was outdated and no longer supported.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

Compression for WR and CR

J

Joe Bleau

Husqvarna
C Class
I change my piston in my WR 240 1985 single ring for a piston CR double ring and I lost some compression. If I look in my technical data of my WR 240, my compression ration is : 15.0:1 (or 220psi). This compression is 15kpa. With my new CR piston I have 11kpa (or a bit more then 150psi).

My question is: is it normal with a CR piston double ring you have lese compression then with a WR piston single ring?

Also, I have to put my throttle screw all over in if I don’t want the engine to stop on idle.

Thanks
 
Have you run in the new piston? are the new and old pistons identical other than the second ring and are the new gaskets the same thickness as the old?.
Idle issue sounds like your bypassing the idle circuit, you may have a blocked or too smaller pilot jet, check your reeds as well another thing to consider may be a different idle screw has been installed.
 
Sorry couldn't Finish last reply due to a Skype call, but if your pilot is way too big you have to increase the amount of air with the slide for an idle, does the bike start easily without choke when cold if so this indicates too rich pilot.
Did the idle issue exist before the new piston if not then run in the piston retorque the head and adjust idle.
Lower compression usually means lower vacuum which means less fuel Is syphoned through the pilot and less air is needed to maintain idle as long as vacuum picks up enough fuel to maintain the idle.
 
You must log in or register to reply here.
Back
Top