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British Bikes / Commando Isolastics
« on: June 05, 2007, 07:43:52 PM »
I'm still struggling to get on top of this 74 commando 850 which I inherited. The isolastics are posing some difficulty largely due to my lack of experience so any help would be appreciated. I’ve read a lot about the rider experiencing a lot of vibration but hadn’t really experienced this myself. There was however a lot of vibration on the engine itself bouncing up and down at low revs. I inspected the front mounting and tried measuring the gap. I wasn’t quite sure which gap I should be measuring but I assumed it was the gap between the large rounded disc and the thin washer (which I now think is a shim). I was about to give up when I found that the main bolt was very loose. After giving this a good old tighten, the washer (or shim?) no longer rotated around as it did on first inspection and the engine no longer bounced up and down. I then think I discovered what everyone was talking about when it came to the rider feeling vibrations. I was quite satisfied but have now been told to check the clearances properly or risk cracking the frame!
My questions I suppose are this: Should I be measuring the gap between the large rounded disc and the shim?
Should I slacken off the main bolt first and then check clearances or should I leave it tightened? What are the tolerances? If the gap is 0.001” off should I take the bike off the road or is it still safe to ride it around, just a bit uncomfortable?
Any help would be greatly appreciated.
Many thanks.
My questions I suppose are this: Should I be measuring the gap between the large rounded disc and the shim?
Should I slacken off the main bolt first and then check clearances or should I leave it tightened? What are the tolerances? If the gap is 0.001” off should I take the bike off the road or is it still safe to ride it around, just a bit uncomfortable?
Any help would be greatly appreciated.
Many thanks.