Gsx1100g Gearbox

[Goo'Roo]

Do you know somebody that has modified the G shaft engine into a final chain transmission?

I'm interested in that engine because of the balancer shaft. Gsx1100Fs die because of vibrations, so It's just an idea.

[Swiss Toni]

Watched a project build the other day on YouTube. Guy converted a Yam 750 3 cyl from shaft to chain. Lot of work involved. Can't imagine the G being any easier. He did all his own machining too! I suppose if you give it a good coat of looking at, and are able to do the machine work 'in house', it might be worth trying. Put it up as a project if you go ahead. We'd  all be interested seeing it, I'm sure!

[Goo'Roo]

I need a G engine, or at least the cases.
I've checked the gearbox bearing/needle roller measures comparing them with an 11F engine and they are the same until the last one that exit the case on the secondary shaft that is much bigger: 40x80x30.2 for the G and 25x62x19. Totally different on the drum side.
It would be interesting to try to fit a F/R gearbox building a flange at the exit of the secondary shaft.

I'm going to search for an engine soon

 

[Swiss Toni]

Don't forget the pictures then! 

[VJ]

Having ridden both I dont rate the balancer system on the G to be honest, definatley not enough to make a modified set of cases to convert over to chain drive. The balancer it just saps a bit of power and doesnt really reduce vibes (I took the weight out on my last build)

 

Also G engines are like rocking horse shit.

[Goo'Roo]

Ok you've convinced me.

I tried to reduce 11f frame vibes with no success and I was searching other solutions.

Clip on and weight at the end of the bar are 3kg each on 4 rubber mounts and it's just acceptable.

Vibes just destroy everything on that bike.

 

[Captain Chaos]

must be something wrong with your engine. I have an 11F lump in my GSX-R750 and no problems with vibrations whatsoever.

[VJ]

aye Id be looking elsewhere, How are your engine mounts? Nice and tight? front mount rubbers not perished?

[Goo'Roo]

I tried in different ways, that's my lower engine support for example.

I think that the best I can do at this point is to balance the crankshaft

No guys, it's not the engine. I have 3 11f. The frame vibes like a diapason.

[VJ]

Sounds like you've exhausted a lot of options. One other one that comes to mind now ive thought about it, have you balanced the carbs recently?

[Goo'Roo]

7 hours ago, VJ said:

Sounds like you've exhausted a lot of options. One other one that comes to mind now ive thought about it, have you balanced the carbs recently?

I have a motorbike workshop in Italy and they're my bikes. 

Doesn't have nothing to do with carbs and so on. Simply at some revs if you keep all the super extra heavy stuff of the stock one mounted or after 5500rpm if you eliminate 30kg as I did on one of the 3, the frame and everything attached to it start to vibrate violently like a diapason.

 

Edited December 5, 2019 by Goo'Roo

[Cheeky4648]

1200 bandits have a big weight mounted between the coils up by the head stock as an anti vibration aid. Maybe something like that would help. 

[Goo'Roo]

1 hour ago, Cheeky4648 said:

1200 bandits have a big weight mounted between the coils up by the head stock as an anti vibration aid. Maybe something like that would help. 

I tried with one and then 2. Doesn't feel nearly any difference. 

 

[VJ]

7 hours ago, Goo'Roo said:

I have a motorbike workshop in Italy and they're my bikes. 

Doesn't have nothing to do with carbs and so on. Simply at some revs if you keep all the super extra heavy stuff of the stock one mounted or after 5500rpm if you eliminate 30kg as I did on one of the 3, the frame and everything attached to it start to vibrate violently like a diapason.

 

As i said it does seem like youve thought this through and tried a lot of things. Ive known a lot of IL4s vibrate quite badly if the throttles arent correctly synced to eachother though.