KHEEREMA129911
New member
After a few months of '75 R90 ownership and a fair amount of highway cruising, I've noticed the bike can wobble/occilate a bit at highway speeds around 70mph if i hit any bumps, pavement overlaps, grades, etc. It kind of feels like a side to side movement or flex, and this can be a little bit disconcerting.
I've changed the front fork fluid with BMW 7.5, overfilled by 10cc's or so to stiffen up a bit, and I have Koni rear shocks set with the minimum for preload which seems to be adequate for solo riding (I'm 205 lbs.) with no cargo. Overall, I'm satisfied with how the bike soaks up bumps and performs in general with the exception of this wobble. I've changed the steering damper from 0 to 2 and vice versa, and i can't tell a difference. My tires are in good condition, good PSI, and I don't believe my frame/forks/rims to be bent from visual inspection, but I guess I could be wrong. I can take my hands of the grips when riding 30mph ish and the bike tracks straight.
1) Am I expecting too much from an old airhead, and should I just hold on tighter?
2) How can I tell if my steering damper needs to be replaced, and which setting on the twist knob is "more stiff"? Is this component replaceable with a new unit?
3) Does this bike have ball bearings in the triple tree that can be upgraded to the taper type bearing units like Hondas of this era?
Overall, its not too bad of an occilation, but I'm just wondering if this is normal for these old beasts, or if a few tweeks could help me cure this symptom. I am using the bike for highway commuting, and any advice/thoughts would be appreciated.
I've changed the front fork fluid with BMW 7.5, overfilled by 10cc's or so to stiffen up a bit, and I have Koni rear shocks set with the minimum for preload which seems to be adequate for solo riding (I'm 205 lbs.) with no cargo. Overall, I'm satisfied with how the bike soaks up bumps and performs in general with the exception of this wobble. I've changed the steering damper from 0 to 2 and vice versa, and i can't tell a difference. My tires are in good condition, good PSI, and I don't believe my frame/forks/rims to be bent from visual inspection, but I guess I could be wrong. I can take my hands of the grips when riding 30mph ish and the bike tracks straight.
1) Am I expecting too much from an old airhead, and should I just hold on tighter?
2) How can I tell if my steering damper needs to be replaced, and which setting on the twist knob is "more stiff"? Is this component replaceable with a new unit?
3) Does this bike have ball bearings in the triple tree that can be upgraded to the taper type bearing units like Hondas of this era?
Overall, its not too bad of an occilation, but I'm just wondering if this is normal for these old beasts, or if a few tweeks could help me cure this symptom. I am using the bike for highway commuting, and any advice/thoughts would be appreciated.