• 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.

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    Thanks for your patience and support!

Longer 35mm forks

B

bigduke

Husqvarna
AA Class
Hello all,
I would like to extend the length of a pair of 1973 CR forks. Will the stanchions (tubes) from a later, say 1978 model fit the earlier fork bottoms?
Thanks
 
Will the stanchions (tubes) from a later, say 1978 model fit the earlier fork bottoms?
Click to expand...

I don't see why not as long as the stanchions are 35mm. You would also need to change the valve body in the bottom of the stanchion to the one in your 73. For a detailed explanation on what will work call John at Vintage Husky. The guy has been messing with Husky stuff for decades and may even have what you need. He will be glad help you out with this.
 
My thought is if you have to use the damping rod parts from the longer fork tube you'll have to consider making internal spacers to limit the travel. If you don't, you could end up with a dangerous situation where at full extension your original lowers don't have enough "overlap" with the fork tubes and could break.
 
Some additional information to consider:

Fork tube inner diameters are different for the silver and black leg forks - some 73's came with one or the other. This will impact which damper rod parts to use. markt2 makes an important point to keep in mind.

Also to keep the bike level, longer rear shocks will need to be used. This may end up in a situation in that the chain will be constantly rubbing on the swingarm pivot due to the increased angle of the swingarm. A chain slider and/or larger countershaft sprocket can help alleviate this. With the swingarm at the increased angle the wheelbase will be shorten. You may want to consider using a swing arm from a 74 250 Mag (1"(25mm) longer) to compensate. This will require a longer chain. All these modifications will impact how your 73 handles.

The approximate fork lengths from top of tube to axle centerline are: 73 - 32" and 78 - 35". A different approach, and much less expensive, would be to add a couple of inches of foam (common CZ/Maico mod) to the seat and either a taller pair of handlebars or handlebar risers. This approach would also mitigate what could be some not so positive handling impacts.

Attached are pages from Husky Newsletter #38. While not directly answering your question, it provides background info for fork parts interchangeability.

HN 38 c - Copy.png

HN 39 b - Copy.png

HN 38 a - Copy.png
 
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