A strange question it may be, but stay with me on this one for a bit, I need your help.
Could someone with an 1100 (preferebaly) or 1150 stick their bike on it’s centre stand and run it up through the gears. Make sure the front end’s weighed down of course! Can you listen for any rattle type noises, like a worn bearing, particularly on the overrun in higher gears.
Having rebuilt my bike after my gearbox woes, I now have a rather nasty noise coming from that area. Least I think it is, it’s hard to identify.
When the bike is on it’s centre stand, engine running and I take it up through the gears, it gets noisier the higher the gear I’m in. It’s a bearing type ‘rattle’ that’s quite loud on the overrun in 5th, but goes when I accelerate. It’s slightly less noisy the lower down through the box I go, in first it’s not really that noticeable above all the other noises.
I haven’t had a proper chance to take it on a road test yet, just a quick bimble up and down the lane (well, farm track) where my workshop is and it didn’t seem to bad. Couldn’t get it into 5th though (not enough space). To try and eliminate things, here’s what I’ve done when I rebuilt it all.
At first I swapped gearboxes with another unit, to do this though I had to swap front covers (the clutch end) from my gearbox to the 2nd unit. However, this 2nd unit prved to be faulty, so having got my original box repaired (it was a broken lug) I proceeded to swap front cover plates back. Then it was a question of refitting everything (after sticking in a new clutch) and seeing what happened.
My thoughts are that maybe I buggered something up in removing and re-fitting of the front cover plate, although I was careful and hopefully replaced all the shims in the right places – there was only a few.) It’s possible I might have disturbed an end-float bearing on one of the shafts, it does sound like a bearing noise, but it sounds as though it’s coming from the shaft. Is it possible I’ve disturbed the drive shaft output bearing in the box? I really hope not but it seems quite likely. Either that or a bearing is spinning in it’s mounting – which is also not good!
Your ideas, comments or thoughts would be much appreciated.
Could someone with an 1100 (preferebaly) or 1150 stick their bike on it’s centre stand and run it up through the gears. Make sure the front end’s weighed down of course! Can you listen for any rattle type noises, like a worn bearing, particularly on the overrun in higher gears.
Having rebuilt my bike after my gearbox woes, I now have a rather nasty noise coming from that area. Least I think it is, it’s hard to identify.
When the bike is on it’s centre stand, engine running and I take it up through the gears, it gets noisier the higher the gear I’m in. It’s a bearing type ‘rattle’ that’s quite loud on the overrun in 5th, but goes when I accelerate. It’s slightly less noisy the lower down through the box I go, in first it’s not really that noticeable above all the other noises.
I haven’t had a proper chance to take it on a road test yet, just a quick bimble up and down the lane (well, farm track) where my workshop is and it didn’t seem to bad. Couldn’t get it into 5th though (not enough space). To try and eliminate things, here’s what I’ve done when I rebuilt it all.
At first I swapped gearboxes with another unit, to do this though I had to swap front covers (the clutch end) from my gearbox to the 2nd unit. However, this 2nd unit prved to be faulty, so having got my original box repaired (it was a broken lug) I proceeded to swap front cover plates back. Then it was a question of refitting everything (after sticking in a new clutch) and seeing what happened.
My thoughts are that maybe I buggered something up in removing and re-fitting of the front cover plate, although I was careful and hopefully replaced all the shims in the right places – there was only a few.) It’s possible I might have disturbed an end-float bearing on one of the shafts, it does sound like a bearing noise, but it sounds as though it’s coming from the shaft. Is it possible I’ve disturbed the drive shaft output bearing in the box? I really hope not but it seems quite likely. Either that or a bearing is spinning in it’s mounting – which is also not good!
Your ideas, comments or thoughts would be much appreciated.
Engines and transmissions are designed to run under load, they need to be driving against a resistance otherwise everything just rattles backwards and forwards due to backlash. It WILL be noisy under these circumstances. On the overrun it will be even worse, it won't know if it's coming or going.