vibration fixed(sort of)

[motelbob]

took the rf back and had the rear tyre whipped off and rebalanced. the mechanic put a couple of extra weights on and the vibration was down to a small niggle. Turns out the shop hasnt got a balancing machine. Is there somewhere in Auck that has a decent balancing machine so I can get it done properly? Also why is it when I pull in my clutch at 100kph and freewheel the vibration goes away completely. Doesnt make sense to me. Surely if the rear wheel was unbalanced the vibration would be there if my clutch was in or not. Its all too much for my non-mechanical brain so Im going to sit down with a few coldies and ponder.

[froggyfrenchman]

did it start all of a sudden or slowly vibratemore to this stage?

[thehollowmen]

eh?
sprocket out of line maybe?

no that still doesn't make sense.

you've got me stumped.

Unless... can someone tell me what would happen if the clutch plates were out of line?

[What?]

Cycletreads, Barry's Point rd, Takapuna (just off Esmonde road).
Your chain's not too tight, is it?

[Ixion]

Fairly sure Motohaus have a balancer

[Dadpole]

Can't help but wonder what sort of business will fit m/c tyres and does not have a balancing machine. Just how unsafe can an out of balance tyre be...

[motelbob]

The chains not too tight. vibration started right after getting new tyres fitted and bike serviced. The shop has a frame that is clamped into a vice . when the wheel is put on for 'balancing' it is spun by hand. By the mechanics own admission ,it's not all that accurate. Wish they'd told me when I rang about new tyres. I'd have gone somewhere else.

[Lou Girardin]

The chains not too tight. vibration started right after getting new tyres fitted and bike serviced. The shop has a frame that is clamped into a vice . when the wheel is put on for 'balancing' it is spun by hand. By the mechanics own admission ,it's not all that accurate. Wish they'd told me when I rang about new tyres. I'd have gone somewhere else.

That method is accurate, if done right. It's just what an electronic static balancer does. Are there any tight spots on the chain?

[F5 Dave]

Lots of people balance like that, just takes a shed load longer.

As Lou sez check that there are no tight spots by spinning the rear wheel & testing in several places. MIND FINGERS!

How out of round is the tire on the rim? I got my RF front straightened as it was a bit bumpy (oval). Spin wheel & look at centre of tread.

[motelbob]

The mechanic basically checked out everything,. the chain isnt too tight. no tight spots. Pretty much had him stumped. He only took the rear wheel off to rebalance because there was nothing else to check. It made a significant difference to the problem but didnt eradicate it Still cant figure out when I pull the clutch in it goes away completely.

[scumdog]

The mechanic basically checked out everything,. the chain isnt too tight. no tight spots. Pretty much had him stumped. He only took the rear wheel off to rebalance because there was nothing else to check. It made a significant difference to the problem but didnt eradicate it Still cant figure out when I pull the clutch in it goes away completely.

Is that regardless of the revs or are you throttling off when you pull the clutch in???

[F5 Dave]

Yeah, could be the engine mounts are loose & the changing of tire is a red herring. But any jerkiness from the rear wheel will tend to be amplified by the restraint of the engine. PS check that front sprocket is tight & not hooked teeth. Mine sounded dreadful when I got it.

[motelbob]

When the clutch was pulled in I did throttle off. Engine mounts were checked out and were fine. will have a nosey at the front sprocket though. CHEERS.

[miSTa]

Also why is it when I pull in my clutch at 100kph and freewheel the vibration goes away completely. Doesnt make sense to me. Surely if the rear wheel was unbalanced the vibration would be there if my clutch was in or not. Its all too much for my non-mechanical brain so Im going to sit down with a few coldies and ponder.

I'm no expert on these matters but I'll offer a thought, by pulling the clutch in are you not removing any load on the whole drivetrain therefore any vibration that did exist under load disappears?

[R1madness]

The chains not too tight. vibration started right after getting new tyres fitted and bike serviced. The shop has a frame that is clamped into a vice . when the wheel is put on for 'balancing' it is spun by hand. By the mechanics own admission ,it's not all that accurate. Wish they'd told me when I rang about new tyres. I'd have gone somewhere else.

Actually it is extremely accurate if you have the time and experiance to do it properly. All the racers use this method and i have done it that way for years and never had a problem. You can get it to the point that a 1inch strip of duck tape will put it out of balance. Never seen a electronic balancer get it that accurate.