Crankshaft lightening and balancing?

[Grumph]

Did either of you have issues with main bearing failures?
One company has told me they have done several GSXR1100/Bandit1200 cranks which suffered main bearing failures after lightening the cranks, something to do with harmonics.

Don't have to lighten them to get that...The speedway Modified mini sprints which used the GSXR1100 oil cooled motors were a byword for main failures and crank breakages. There's a critical torsional resonance in those cranks which coincided with the rev band the speedway motors worked in. Removing the starter clutch helps as it raises the critical resonance rpm...but we couldn't do that on the speedway cars as they had to self start...The 750 TQ's never suffered from this but I had a very sensitive and successful customer who wanted the starter cluch left on for better throttle control.
Back in the day, Peter, Holden told us that he'd ridden an Aussie 1100 with a light crank - and didn't like it at all. Ours was stock. Only probs we had were odd wear patterns on the end mains which we ID'd as the cases flexing...Robert again...

[Peter Smith]

Don't have to lighten them to get that...The speedway Modified mini sprints which used the GSXR1100 oil cooled motors were a byword for main failures and crank breakages. There's a critical torsional resonance in those cranks which coincided with the rev band the speedway motors worked in. Removing the starter clutch helps as it raises the critical resonance rpm...but we couldn't do that on the speedway cars as they had to self start...The 750 TQ's never suffered from this but I had a very sensitive and successful customer who wanted the starter cluch left on for better throttle control.
Back in the day, Peter, Holden told us that he'd ridden an Aussie 1100 with a light crank - and didn't like it at all. Ours was stock. Only probs we had were odd wear patterns on the end mains which we ID'd as the cases flexing...Robert again...

Cheers Mate,
Jay from APE Racing says the 1127 cranks are renouned for breaking around the journals. The 1052 and Bandit 1200 are fine.
Thanks for the feedback, much apreciated.

[roogazza]

Did either of you have issues with main bearing failures?
One company has told me they have done several GSXR1100/Bandit1200 cranks which suffered main bearing failures after lightening the cranks, something to do with harmonics.

Sorry for the delay there,gardening you know,retirement is a bastard.
No ,no failure on mine at least,but I kept modest rev limits on a fairly mild state of tune. It was a beaut motor tho and a friend has since gone quite mad with it in sleeved 1340 spec.yoshi stage 2 cams. Still no probs which maybe because there's no need to rev the shit out of it.
Or maybe the crank work/care helped, dunno? It was supposed to.
He went the big valve way too, studs kits ,the lot. Love to buy it back.
Make a great pre 89 shhhhhh ! just joshin !

[Fast Eddie]

Someone in the NI is doing very nice work - I've had an R1 and FZR600 through here both with cranks that were works of art.....

The R1 was a sidecar motor so someone in that crowd may know. I'd like to know who did them too.

Do you have the old FZR1000 that was in my Windle then Grumph? Is it rebuildable?

Waddya doing with the FZR600?

[Grumph]

Do you have the old FZR1000 that was in my Windle then Grumph? Is it rebuildable?

No - and no idea. think it had done a big end - ask Bill what happened to everything.

Waddya doing with the FZR600?

Nothing - the owner sold it as he is having fun with his GS1000 against pre 89's...it's down your way now but hasn't been seen out at all i understand. Pity as we'd won pre 89 at Wyndham 3 times in a row....it's a good'un.

[Fast Eddie]

Nothing - the owner sold it as he is having fun with his GS1000 against pre 89's...it's down your way now but hasn't been seen out at all i understand. Pity as we'd won pre 89 at Wyndham 3 times in a row....it's a good'un.

Bill sold it all with the Windle sidecar to a fella named Grant who was a speedway guy. That fella blew the fancy fzr1000 up and put it aside and fitted the r1 which it has now. When the windle was sold to fella named Dave up north - the FZR didn't go with it.. What happened to it I'm not sure - Grant never returned calls or messages. I heard it made its way to another fella named Bevan in ChCh and then was sold again to someone else..

It was a bloody quick motor - The windle used to catch up to the agip bike like it was in reverse.. At the moment the agip bike pulls away from the windle down a straight

[Kickaha]

Bill sold it all with the Windle sidecar to a fella named Grant who was a speedway guy. That fella blew the fancy fzr1000 up and put it aside and fitted the r1 which it has now. When the windle was sold to fella named Dave up north - the FZR didn't go with it.. What happened to it I'm not sure - Grant never returned calls or messages. I heard it made its way to another fella named Bevan in ChCh and then was sold again to someone else..

It was a bloody quick motor - The windle used to catch up to the agip bike like it was in reverse.. At the moment the agip bike pulls away from the windle down a straight

It most likely would have been fucked anyway, didn't it put a rod out the front of it?

[Grumph]

Bill sold it all with the Windle sidecar to a fella named Grant who was a speedway guy. That fella blew the fancy fzr1000 up and put it aside and fitted the r1 which it has now. When the windle was sold to fella named Dave up north - the FZR didn't go with it.. What happened to it I'm not sure - Grant never returned calls or messages. I heard it made its way to another fella named Bevan in ChCh and then was sold again to someone else..

It was a bloody quick motor - The windle used to catch up to the agip bike like it was in reverse.. At the moment the agip bike pulls away from the windle down a straight

The Bevan would be Bevan Nuttridge, another speedway guy in ChCh - and i've been waiting 18 months for him to get back to me about a GS1000 motor on the coast which he wanted to sell. Allegedly in a mates storage container with other motors.....

Kai if you want to chase him up, he works for City South Van spares in ChCh....hope you have better luck than me.

[jellywrestler]

- and i've been waiting 18 months for him to get back to me about a GS1000 motor on the coast which he wanted to sell. Allegedly in a mates storage container with other motors.....

.

it could be this little sweetheart.....


http://www.trademe.co.nz/Browse/List...x?id=756623366

[Fast Eddie]

It most likely would have been fucked anyway, didn't it put a rod out the front of it?

yea it probably was fubar

[Fast Eddie]

Kai if you want to chase him up, he works for City South Van spares in ChCh....hope you have better luck than me.

Cheers, Yea I tried to chase him up for the motor like 2 years ago now when I was still running the agip bike to try get FZR bits for that.. But meh - running R1 in the windle now so not that fussed. The good bits it had from when it came from the UK are probably long gone anyway

[Grumph]

it could be this little sweetheart.....


http://www.trademe.co.nz/Browse/List...x?id=756623366

that is a gem...Nah, west coast SI I meant.

Wonder where all the GSX1100's with one 750 piston have gone ? I did at least three for speedway chairs.