TTI Gearbox

Brian Riley

Brian Riley

VIP MEMBER
Joined
Apr 19, 2020
Messages
21
Country flag
Is there anyone on here using a TTI Gearbox?
I’m wanting to order one for my 500 dominator and looking at the dimensions they give the commando set up is to long for a domi and different offset for the rear chain
But seems to be perfect on the manx dimension for the rear chain! But my question has anyone tried to fit one to a dominator and what spec did you end up with?

Cheers
Brian
 
If you contact Andy at Molnar Precision, he'll explain what size shaft you need. You will most likely end up needing to cut down your mainshaft a little. Its pretty easy once he knows which size mainshaft you have.

TGA.co.uk
 
I have used a TT 6 speed box on my Dommie for 15 years. Just tell Bruce what you using it for. Sorry I don't have the lenght but he definitely does them.
 
seattle##gs said:
Ask him about how much grinding on the mounting plates is necessary
Click to expand...
These drawings are for a Commando, so grinding will be needed to fit, but I'm thinking if engine/gearbox plates are used that are "Open" at the rear, that might not be needed.

Still stripping paint and doing alignments on mine (Centralising engine), so cant say for sure.
 

Attachments

  • TTI Gearbox
    Norton cradle TTi b.jpg
    85.9 KB · Views: 74
  • TTI Gearbox
    Norton cradle TTi a.jpg
    77.3 KB · Views: 67
Last edited:
I repaced an an AMC box with a TTI. I did not find a problem with the alignment of the rear chain. The bottom mounting point needed to be moved slightly and the bolts were slightly bigger, so I made new ones out of titanium. The primary chain alignment was a minor problem. The TTI box has a longer mainshaft which affects the situation when you use the early clutch. My primary drive uses Jawa speedway engine sprockets which float on splines. With a road bike, you would not do that, but if you rat through all the old Norton engine sprockets, they all fit the 5 degree Norton taper, but several of them give different primary chain alignments. When you find one which goves the correct alignment, you can adjudt the overall gearing with the countershaft sprockets which Bruce supplies with the TTI box.
Your problem would be more about finding an engine sprocket. Works Norton were making replica Manx Nortons, so might be a source. You need to find somebody who played with ES2 or other old singles. Alternatively, you could use a Commando clutch. The difference in alignment is about 6mm.
 
Have a TTI on my -59 Manx. Chain alignment just needed a .5mm shim under engine sprocket. Easy on a Manx as it has a splined shaft. But I think that it was originally fitted with a laydown gearbox. So the AMC looking TTI inner cover had to be milled a bit, not to interfere with the bottom frame tube. Also some filed away on the case to make chain adjustment full slot length possible. After 5 years use the hard to shift into 5th has freed up.
Have one with the low first option. Better as I don't have to slip clutch in the hairpins. Also makes it almost possible to keep it under the pit fast lane speed limit without slipping clutch. Completely empty under 4500 rpm.
Why I prefer the 5 speed. First reason is that the old brain have problem with 6 speeders. Had to fit a gear indicator on the Ninja. Second reason is that the spacing between gears are more logical. Progressively less rev drop upshifting at higher gears where wind resistance is greater. As a once upon a time sidecar racing gearbox designer, I don't understand why TTI made the 6 speeder gear spacing a bit irregular. Though I've never heard any racer complain of it.
 
Paul (850 Commando.) said:
These drawings are for a Commando, so grinding will be needed to fit, but I'm thinking if engine/gearbox plates are used that are "Open" at the rear, that might not be needed.

Still stripping paint and doing alignments on mine (Centralising engine), so cant say for sure.
Click to expand...
Hi paul mines going in to a featherbed wideline with domi alloy plate so hopefully not need any grinding done
 
You must log in or register to reply here.
Back
Top