Replacing the transmission chain-question - MVAgusta.net
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post #1 of 21 (permalink) Old 08-13-2013, 03:31 AM Thread Starter
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Replacing the transmission chain-question

Dears,

F4 1078 with 24500kms on clock and a knackered chain. Found the Sigma series Tsubaki 525 chain X ring and both sprockets replaced.

My mechanic upon placing the new chain said he thought of moving the rear tyre towards the engine by rotating the hub clockwise with that U spanner tool so that in the future when it needs to be tightened I have 'room' to do it.

Problem: the rear tyre now touches the left lower side fairing and the rear hub seems to be 1-2 mm out. Has he screwed up sth at the rear? Is it just a matter of adding 1-2 links to the chain (it was almost tight at that position) and getting the rear tyre a little away from the fairing by rotating the spanner anticlockwise? The chassis workshop manual says very little on replacing the chain (with regards to the position of the eccentric wheelhub). Any tips please or things to avoid?

Thanks as always for help
Phil

Last edited by PP1098; 08-13-2013 at 04:19 AM.
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post #2 of 21 (permalink) Old 08-13-2013, 04:41 AM
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Your mechanic messed up a bit Phil, it's more about common sense rather than relying on the manual. If he added the new chain with the same amount of links that the old one had in, you would have been fine.
If he checked the wheel position and rotation before cutting your new chain, he would have noticed this problem.
There is no defined position for the hub, it's dictated by your chain tension.
You can add another link or two, but I would not like to have two master links on my chain, I would have a chat with the mechanic about replacing that chain.

What do you mean your hub is 2mm out ? Where ?
I hope he is torqueing the pinch bolts for the hub back up to spec !

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post #3 of 21 (permalink) Old 08-13-2013, 05:38 AM
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And don't forget ride height.....if you have moved the hub that far the ride height has definitely been affected. Part of significant chain adjustment is also resetting ride height.....it's in the manual.

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post #4 of 21 (permalink) Old 08-13-2013, 05:47 AM
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And don't forget ride height.....if you have moved the hub that far the ride height has definitely been affected. Part of significant chain adjustment is also resetting ride height.....it's in the manual.
Ed, it's 6:38am........you must be sitting on the john, eh?

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post #5 of 21 (permalink) Old 08-13-2013, 05:50 AM
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Ed, it's 6:38am........you must be sitting on the john, eh?
Not yet....up at 5:15....fixed breakfast, cleaned up the kitchen...packed my girl off to work.

Morning constitutional and shower shortly then off to the north....Indy MotoGP beacons.


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post #6 of 21 (permalink) Old 08-13-2013, 06:02 AM Thread Starter
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Thanks guys. Yes the rider height. I forgot about that..I guess seat must be lower now..

Dons agree 100% I already requested a new chain. The hub came out a bit when looking at it from the rear. On the right hand side of the toothed part I can see a shiny thin 'ring' of metal so since its one part I guess its the hub moving towards the chain-left. I am assuming that with the pinch bolts loose the force required to turn the toothed part with the spanner is enough to force the hub out...?? Or am I seing things?
Thanks again
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post #7 of 21 (permalink) Old 08-13-2013, 08:05 AM
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Your bike weights on the stand and on the hub, rotating yes , sliding sideways it's more complicated....

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post #8 of 21 (permalink) Old 08-13-2013, 11:32 PM
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The hub came out a bit when looking at it from the rear. On the right hand side of the toothed part I can see a shiny thin 'ring' of metal so since its one part I guess its the hub moving towards the chain-left. I am assuming that with the pinch bolts loose the force required to turn the toothed part with the spanner is enough to force the hub out...?? Or am I seing things?
Thanks again
Sounds wrong, very wrong (like don't ride it!) , can you post a picture ?
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post #9 of 21 (permalink) Old 08-14-2013, 01:08 AM
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Wink ?

Quote:
Originally Posted by esq'z me View Post
...packed my girl off to work.
isn't that what got you in trouble before???

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post #10 of 21 (permalink) Old 08-14-2013, 01:17 AM
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????

sounds like the mechanic screwed up the chain length like Donsy said

AND then tightened the pinch bolts, BEFORE tightening the sprocket nut.....

as I see it thats the only way the wheel can be too far to the left



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