If a chain was too tight *UPDATE*

[funmonkee]

What damage could it cause

Aside from snapping...

Has anyone had a chain that was too tight 'unscrewing' the rear sprocket bolts

I had an experience tonight and it wasn't pleasant
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**** Don't ride faster than your angel can fly Get this Free Space
The democratically elected Mod of the Scottish Section - The Peoples Choice[b]

[TAX MY BRAIN]

not nice all all,

did you use locktight on the rear sprocket bolt's

much damage ??
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i also ride the local bike.............she's like a moped great fun to ride as long as your friends dont see you !!

[funmonkee]

three bolts were about 3-4 mm out, one was about 10 mm into tbhe swingarm,... not sure how safe that is now... btw it's an MZ Baghira... felt like a flat rear tyre at first then bahboom locked tight. had to cut the bolt with a hacksaw to free the wheel and trundle home with fingers crossed

TBH, I've had the bike about a week and ahalf and didn't check the sprocket bolts...but I'm sure I would have noticed them hanging out....
____________________
**** Don't ride faster than your angel can fly Get this Free Space
The democratically elected Mod of the Scottish Section - The Peoples Choice[b]

[Kickstart]

Hi

Surprised it did anything to those nuts. Very surprised.

Normal affect of an over tight chain is to wreck the bearing behind the front sprocket.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Finglonga]

As above, I would think the bolts were already loose and the tight chain had nothing to do with it.
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Andy Sez....
F.Y.Y.F.F.

[funmonkee]

It's difficult to get good pictures especially since the damage is on the inside of the swingarm

https://i133.photobucket.com/albums/q73/funmonkee/baggi%20prob/IMG_0191.jpg

https://i133.photobucket.com/albums/q73/funmonkee/baggi%20prob/IMG_0190.jpg

here's you can see the groove is along the weld

https://i133.photobucket.com/albums/q73/funmonkee/baggi%20prob/IMG_0196.jpg

All seems pretty solid, but I'm note sure, definately not 100% sure...
____________________
**** Don't ride faster than your angel can fly Get this Free Space
The democratically elected Mod of the Scottish Section - The Peoples Choice[b]

[Kickstart]

Hi

What bike is it? Not seen bolts used like that. Pretty much every bike has a bolt coming from the inside with a nut on the outside, and the nut is normally some kind of self locking one.

Check the sprocket carrier bearing hasn't failed.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[TAX MY BRAIN]

is it the picture or is your chain covered in red rust ??

as for the damage to the weild id get it checked out by someone in the know
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i also ride the local bike.............she's like a moped great fun to ride as long as your friends dont see you !!

[funmonkee]

yeah I think once I've got then new bolt(s), I'll take it a nice slow ride along to the local tech and ask their advice. I think the groove is about 8-10 mm deep into the swingarm.

The manuals say the bolts are ISO7380 M10 x 1,25 x 40-10.9

TBM, the chain has some rust. I've been oiling the chain by hand all week (waiting for an automatica oiler to turn up ) I think the red is just my camera...its more brown...
____________________
**** Don't ride faster than your angel can fly Get this Free Space
The democratically elected Mod of the Scottish Section - The Peoples Choice[b]

[Pete.]

My guess is that the sprocket wasn't torqued properly and the vibration set-up by running an over-tight chain has worked tohe bolts out. Either that or just a co-incidence.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Kickstart]

Hi

It they are meant to be bolts then I would guess they are meant to be loctited in.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[funmonkee]

The most worrying thing, was the night before I had it upto an indicated 100 MPH... glad the bolts didn't decide to make a sharp exist then
____________________
**** Don't ride faster than your angel can fly Get this Free Space
The democratically elected Mod of the Scottish Section - The Peoples Choice[b]

[yen_powell]

If you run your chain too tight you run the risk of shagging your output shaft bearing. This usually means splitting the crankcases to replace a 10 quid bearing, which in most engine designs means taking the whole lot apart.
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Blackmail is a nasty word........but not as nasty as phlegm!
XT1200Z and a DR350 in bits

[Billd]

I'm not sure I'd be happy with that weld on the swinging arm! Has it been broken and repaired in the past? I agree that the bolts look very weird, usually bolts coming out with nuts on the outside!!
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Remember. wherever you go, there you are!!
FVMCC

[funmonkee]

There is a weld on both sides of the swingarm. I think it's just the way the swingarm is constructed. I might take swingamr off and get it strengthen/checked over.... but I really wanted this bike to be my winter hack ..and not have to worry too much about it...
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**** Don't ride faster than your angel can fly Get this Free Space
The democratically elected Mod of the Scottish Section - The Peoples Choice[b]

[alun111]

[hmmmnz]

lol, do you think he's 15 and just got his learners???

he's just a lazy bastard


paul are you saving up all your jobs for me when im back in scotland in may???
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the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[hmmmnz]

oh yeah,

the swing arm is supposed to be like that (not the nut dent)
its the join from the square tube to the solid section for the axle.
if you are worried take a quick blast up to our friends at pentland tech, and speak to the master

he'll tell you if he thinks it needs to be strengthened,

my guess is its fine, but you might want to get him to fill in the gouge and get some loctite onto those bolts
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[funmonkee]

TBH, the gouge isn't that impressive. I can get my pinkie in the groove, but it doesn't look too worrying.

I'll need to check everything on the bike now...

Hmmmnz, I guess the MZ will be the bike you'll use in May
____________________
**** Don't ride faster than your angel can fly Get this Free Space
The democratically elected Mod of the Scottish Section - The Peoples Choice[b]

[Wozza]

What are the symptoms of a worn sprocket carrier bearing / output shaft bearing? And is running one likely to cause any further damage?

[Kickstart]

[stirlinggaz]

hi,
havnt read all the replies, so dunno if this has been said,
but i learnt the hard way, when i overtightened a chain years ago, on a 125.
as i was pulling away in 2nd it felt like i had left the choke on,
then when i got up to around 40, in 3rd, heard an almighty bang & i lost speed. (i was going up hill)
quickly pulled the clutch in & managed to get to side of dual carriageway when i discoved that the overtightened chain caused 2 of the sprocket bolts to shear & the sprocket carrier to shatter!
i was luck it didnt cause any more damage to me & the bike.
cheers,
GAZ

[Wozza]

Keith:
My chain has a tight spot and I was previously running it having adjusted the slack on the looser side. I could feel pulsing vibrations through the pegs and thinking it could be to do with the chain, decided to check the slack along its whole length - this is when I discovered the tight spot.
I adjusted the slack on the tight spot and the pulsing vibration disappeared, however I can feel a more constant but feint vibration at slow speed when engaging the clutch. Could this be something caused by the previously tight chain ie a bearing gone, or could it be just normal vibrations?
Many thanks,

And sorry for jumping in on your thread vmax!

[funmonkee]

[stirlinggaz]

hi,
try "stagonset" stock just about every bolt i've ever needed (well, the ones i couldnt get from local hardware store(AA-components bridge of allan).
63pence each i think.
never really bothered if i couldnt get the right lenth , just bought next size up & cut the excess off if necessary. (as long as pich/thread is same) though they do stock 40mm & 45mm
cheers,
GAZ
EDIT - cant see them on stagonsets site but there definately on NAMRICK's site.