Just another good reason for a TTi gearbox. Molnar says the next TTi gearbox he has a failure with will be the first one that has ever failed. His race team and the teams he supports ride harder than I ever will.The shifting problem occurs only when the engine is running, i.e., when shafts are turning. Did you assess vibration level by touching the gearbox?
If vibration level feels unusually strong compared to level at the engine, you should consider bent shafts as culprit.
- Knut
Even if you sort your stock box out, you will love the TTI. The gear ratios are perfectly spaced in the 5 speed box. And the shift is so mouth and precise. And the lever travel is much reduced. And most of all… it’s bomb proof.Just another good reason for a TTi gearbox. Molnar says the next TTi gearbox he has a failure with will be the first one that has ever failed. His race team and the teams he supports ride harder than I ever will.
Thanks for the thoughts. I will look into it.
I expect the TTi gearbox will be complete transformation and make the bike a lot more enjoyable to ride in every riding situation an old guy might get into.Even if you sort your stock box out, you will love the TTI. The gear ratios are perfectly spaced in the 5 speed box. And the shift is so mouth and precise. And the lever travel is much reduced. And most of all… it’s bomb proof.
You’ll have to be prepared for some messing around (cradle, perhaps chain alignment, etc) but it’s worth it.
I rode my 850 commando for a while with a none cush drive back wheelNote from Andy Molnar on the strength of the TTi gearbox. I asked if he had a good cush rear drum with sprocket suggestion. He said the TGA race bikes do not employ any cush in the drive train, and they have never broken a TTi gearbox since they started using them. I won't be putting anywhere near as much stress on the gearbox riding around on the street as a rider on a bike trying to win a race. I may put more miles on, but not more stress.
I believe him. I plan to continue to use my funky old rear drum brake without cush with the TTi gearbox and not worry about it at all. One less thing to replace.
Hi Schwany,Standard TTi 5 speed. For the most part the TTi 5 speed comes in two flavors Standard and Heavy Duty. The gear ratios are listed at the bottom of the description here. I'm also considering changing the engine pulley to 28 teeth from 27. I am using a 21 tooth gearbox sprocket instead of the 19 tooth that is standard on a P11.
Only thing I'm still thinking about is if I want to go to 520 chain. The TTi 530 gearbox sprocket is special order. Although with a 20 week lead time, the whole enchilada is special order.
The 5 speed makes sense to me.
Was that with a TTi gearbox?I rode my 850 commando for a while with a none cush drive back wheel
I was getting a nasty crunch putting it into first
And going down the box wasn't as pleasant but apart from that it was fine
Got that covered I hope. I'm going to have a new sprocket/drum turned down for 520 chain if I can find a new one or a very good condition used one. I special ordered the gearbox with a 530 sprocket so I can use it with what I have now, and bought a 520 gearbox sprocket. The lead time is so long I doubt a few extra weeks waiting on the 530 gearbox sprocket will make any difference. Getting it in the frame is going to be 2024 winter project.Hi Schwany,
If you go with 520 chain, what will you use for rear brake/sprocket?
Ed
No not tti just a stock 850Was that with a TTi gearbox?
I'm currently using no cush in the rear. Can't tell much difference so far. Maybe when the clutch gets more miles on it I'll notice something.
I planned to wait before having any machine work done.My advice FWIW is don’t machine down either of your sprockets until you’ve done a dry build as you can gain a useful amount of movement by machining one face or t’other which may help with alignment.
Schwany, I guess I'm as crazy as you. I ordered and put a deposit on a TTI 5 speed yesterday. Mine is for a Commando though.I planned to wait before having any machine work done.
I got the AMC gearbox box working fairly well under power. I did three things to it while I had the inner and outer covers off, so I'm not positive what got it shifting better. I'll take the win though. It might be the fourth thing that got it working, and that is ordering and putting a deposit on the TTi gearbox.
Yowza. Let that crazy flag fly!Schwany, I guess I'm as crazy as you. I ordered and put a deposit on a TTI 5 speed yesterday. Mine is for a Commando though.
Ed
If your outer cover is flat, how can it pull the inner case halve outward at the rear? That is impossible, unless your outer cover is deformed. A result of the shimming perhaps?With everything tightened up it pulled the inner case outward at the rear behind the clutch dome. You would have to experience it. The inner case is not as structurally rigid as the outer case. The perimeter screws pull the rear of the inner case out rather than pull the outer case inward.
If your outer cover is flat, how can it pull the inner case halve outward at the rear? That is impossible, unless your outer cover is deformed. A result of the shimming perhaps?
I can assure you, the factory is not responsible for your odd experience. True, the inner case is not very stiff, but stiff enough for its intended purpose, and that's what matters. Maybe you should consider having a new inner cover machined, similar to the Commando's primary cover.
- Knut
As a matter of fact I do own a P11, several G15s, and a G80CS, all using the same primary case arrangement. I thought you had a balanced centre spacer and perimeter spacer. Without this, the inner cover will bend for sure.If you had a P11 and knew how it is put together you might actually understand how it is possible.
As a matter of fact I do own a P11, several G15s, and a G80CS, all using the same primary case arrangement. I thought you had a balanced centre spacer and perimeter spacer. Without this, the inner cover will bend for sure.
- Knut