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  1. #1

    Choppy ride

    I recently changed the fork oil on my R80. I had the front forks disassembled for a while before I could get started on them again. When I first put them back together I realized that they were way too soft. They would collapse under my weight. I figured that I must have forgotten something but couldn’t figure out what. I cut two pieces of pvc pipe 1.5 inches and added them to the forks for increased spring stiffness. I also experimented with 1 inch pieces but felt the forks would collapse too much. Now the laden/unladen compression difference in inches is within limits but I feel every ripple in the road. Got any advice?

  2. #2
    Liaison 20774's Avatar
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    What year is the bike? What type of oil did you use? How much did you put in the forks?
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    1978. I used 235ml I think...

  4. #4
    '99 '03 '06 National Co-Rally Chair Friedle's Avatar
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    Front suspension in good working order is a pretty important thing. If it were me, I would take it apart, get somebody who knows what they are doing and then put it back together.

    Are you a member of the Airheads Beemer Club (www.airheads.org)? Lots of technically savvy members all across the country willing to help other club members. Where are you located?

    Friedle
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  5. #5
    Liaison 20774's Avatar
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    Be sure your initial sag is right. Put bike on center stand and slip a ziptie around the fork just above the seal. The boot might need to be raised. Then the bike off center stand gently. Get on the bike...ideally have someone hold the bike while you lift your feet. Sag should be about 1/3 of total travel, or maybe 2-1/2 inches. This is adjusted with the spacers as you were doing.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  6. #6
    Registered User Anyname's Avatar
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    Clymer lists the fork spring free length should be 567mm (22.323"). You may want to measure yours. The 235CC of fluid looks right.
    BMW R bike rider, horizontally opposed to everything...

  7. #7
    got, got, got no time... rguy's Avatar
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    Quote Originally Posted by brio View Post
    Now the laden/unladen compression difference in inches is within limits but I feel every ripple in the road. Got any advice?
    Sounds like it could be some stiction issues. Just my opinion.....
    Neal - '16 R1200GS / '81 R65
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