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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Girdraulic eccentric shimming method
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<blockquote data-quote="greg brillus" data-source="post: 136276" data-attributes="member: 597"><p>Actually one thing on these bikes that can be quite nasty........I've struck this a few times and the symptoms vary from mild to chronic....... It is possible to install too many ball bearings on assembly of the steering stem.........this will make low speed stability of the front end feel very weird........I've had similar and one in particular was reeeealy bad.........It had me quite worried, because I'd just installed the modified stem kit and all that goes with it. well on many bikes with no issues........This one however had touring guards and when riding the bike, the low speed cornering felt rally scary, very unstable, like the front wheel was sitting on a large ball bearing itself.........It did seem to have a smallish amount of play in the steering head bearings.........I disassembled it, and found the lower steering head race was crooked in the pocket........so one side was lower than the other by about 1 mm or so..........I think this might be more common than you might think, the bearing was not loose at all, and after removal you could see it had broached its way in leaving a steel ridge in the pocket.......I had to dremel this away, and then the bearing race went fully home........After reassembly the bike was an absolute delight to ride........just lovely.........But it sure had me a bit worried. Also this bike had the 19 inch front wheel with a larger width tire.....I think a 3.50 x 19 I felt this may have made the symptom worse than if it had say a 3.00 x 20 with less contact patch on the road surface. If your bike has a low speed odd feeling not unlike if the steering damper is wound on, but in fact it is not........you might find the bearings and their either fit in the pocket, or similar is the culprit, and not easy to spot without looking very carefully...........Cheers all........</p></blockquote><p></p>
[QUOTE="greg brillus, post: 136276, member: 597"] Actually one thing on these bikes that can be quite nasty........I've struck this a few times and the symptoms vary from mild to chronic....... It is possible to install too many ball bearings on assembly of the steering stem.........this will make low speed stability of the front end feel very weird........I've had similar and one in particular was reeeealy bad.........It had me quite worried, because I'd just installed the modified stem kit and all that goes with it. well on many bikes with no issues........This one however had touring guards and when riding the bike, the low speed cornering felt rally scary, very unstable, like the front wheel was sitting on a large ball bearing itself.........It did seem to have a smallish amount of play in the steering head bearings.........I disassembled it, and found the lower steering head race was crooked in the pocket........so one side was lower than the other by about 1 mm or so..........I think this might be more common than you might think, the bearing was not loose at all, and after removal you could see it had broached its way in leaving a steel ridge in the pocket.......I had to dremel this away, and then the bearing race went fully home........After reassembly the bike was an absolute delight to ride........just lovely.........But it sure had me a bit worried. Also this bike had the 19 inch front wheel with a larger width tire.....I think a 3.50 x 19 I felt this may have made the symptom worse than if it had say a 3.00 x 20 with less contact patch on the road surface. If your bike has a low speed odd feeling not unlike if the steering damper is wound on, but in fact it is not........you might find the bearings and their either fit in the pocket, or similar is the culprit, and not easy to spot without looking very carefully...........Cheers all........ [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Girdraulic eccentric shimming method
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