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 The previous version was outdated and no longer supported.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

Racing set up 250 WR 1983: gearing + jetting

niczeh

niczeh

Husqvarna
C Class
Hi!
I bought a 250 WR 1983 from Finland, did some adjustments (the bike was in an overall good condition).
Did the legalization for Germany and did a first vintage enduro race last weekend. I love the bike, but:
I am not happy with the „performance“.
The bike lacks the power for a special test in gearing/low end gearing.
Of course, having done only 20 miles testing before racing the bike, I ran the rather rich original set-up, with a Main jet 410, needle 6F16, pos 3, needle jet P-8, idle jet 35, slide 2.0. Mikuni VM38, of course. New airfilter.
I ran a Q-0 and idle jet 40 before, low power was even less.

Today I mounted a 2,5 slide, needle still 3rd pos. Low end power has improved.

I am trying to figger out, how to improve the performance for special tests.

Gearing is 12-52.

What I have read so far:
Dirt Bike tested the 84 WR and switched gearing to 12-56, which was a great improvement, as they stated. The tested in the mountains, so jetting can‘t be of any use.

Moto Verte tested the 83 ISDN 250 WR of Marc Morales in 1983 and Marc is stated to run the 12-52 gearing(!), which is proved by the pictures. He is quoted with not wanting to share his jeting setup, but he would have a „very lean“ setup. So he must have changed the low end power by the jetting. The bike was unchanged in exhaust etc.

Is anyone out there racing his 83 WR 250 in woods etc and can share a good working setup?

Cheers
Nic
 
niczeh said:
Hi!
I bought a 250 WR 1983 from Finland, did some adjustments (the bike was in an overall good condition).
Did the legalization for Germany and did a first vintage enduro race last weekend. I love the bike, but:
I am not happy with the „performance“.
The bike lacks the power for a special test in gearing/low end gearing.
Of course, having done only 20 miles testing before racing the bike, I ran the rather rich original set-up, with a Main jet 410, needle 6F16, pos 3, needle jet P-8, idle jet 35, slide 2.0. Mikuni VM38, of course. New airfilter.
I ran a Q-0 and idle jet 40 before, low power was even less.

Today I mounted a 2,5 slide, needle still 3rd pos. Low end power has improved.

I am trying to figger out, how to improve the performance for special tests.

Gearing is 12-52.

What I have read so far:
Dirt Bike tested the 84 WR and switched gearing to 12-56, which was a great improvement, as they stated. The tested in the mountains, so jetting can‘t be of any use.

Moto Verte tested the 83 ISDN 250 WR of Marc Morales in 1983 and Marc is stated to run the 12-52 gearing(!), which is proved by the pictures. He is quoted with not wanting to share his jeting setup, but he would have a „very lean“ setup. So he must have changed the low end power by the jetting. The bike was unchanged in exhaust etc.

Is anyone out there racing his 83 WR 250 in woods etc and can share a good working setup?

Cheers
Nic
Click to expand...
I have an 82 so this may not be any help but I run an 11 tooth front sprocket. I do a lot of technical riding so I still find it fast enough at top speed but it gives me more grunt though the tricky bits and steep climbs
 
I am not happy with the „performance“. The bike lacks the power for a special test in gearing/low end gearing.
Click to expand...
Does the bike have the original exhaust? Have you checked the spark arrestor? These screen type arrestors are notorious for becoming restricted due to carbon buildup thus killing power slowly.
 
If the spark arrestor is unobstructed then take a look at this Mikuni tuning guide, the short version. I used this to tune my 73 450. It takes time and an investment in jets but it allowed me to get the most HP out of my 450. The full version of this tuning guide can be found at: http://www.klemmvintage.com/mikuni-tuning.htm
 

Attachments

I had an 83 250WR. Low end is definitely a bit soft. For more low end, you can try running a thinner base gasket to lower the cylinder. Aim for a squish distance of 1mm. Here in the U.S. you can buy base gaskets from Cometic in many different thicknesses.
 
You must log in or register to reply here.
Back
Top