TTI gearbox in P11 leaking behind the sprocket

Schwany

Schwany

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I get a dribble out of my TTI gearbox after a ride. I do not put it up on a center stand. P11's never had one and my portable stand won't fit where I park the bike in its hidey hole in the garage. Side stand is on a block and the bike is almost straight up when parked. Oil is filled to midway up the kickstart shaft. My rear chain is not run tight ever and neither is my clutch belt.

Anyway, does anyone know the specs for the seal for the case behind the sprocket? Since TTI doesn't provide a damn bit of information about their gearboxes (to me anyway), I'm going to call it a sleeve gear or mainshaft seal. I sent a request to TTI asking about the seal, but I probably won't hear back for a month or possibly never. It's race season and they are probably busy.

I realize I may be the only one participating in this forum that has a P11 with a TTI 5 speed box. Hence I am mostly talking to myself. Nothing new regarding what I have done with the P11. I'll probably post a version of this in the Commando forum and be ignored there as well. :)

Vaughan at TTI got back to me already with the seal spec. Impressive response time.
 
Last edited:
Venting issue? AMC gearboxes are vented, which prevents overpressure. I don't recall a vent at the TTI gearbox.

Leaking low mileage seals does happen. It happened to my car years ago.

Please post spec for the sleeve gear seal !

- Knut
 
mdt-son said:
Venting issue? AMC gearboxes are vented, which prevents overpressure. I don't recall a vent at the TTI gearbox.

Leaking low mileage seals does happen. It happened to my car years ago.

Please post spec for the sleeve gear seal !

- Knut
Click to expand...
The pre-Commando AMC gearbox that was on my P11 is not vented unless you count the clutch pushrod hole through the mainshaft. I added a vent, but it was a waste of time mostly.

I don't think adding a vent to the TTI gearbox would be beneficial or TTI would have done it.

Yeah a low mileage leak is a bit disappointing considering what the gearboxes cost new.

Quote from Vaughan:

"The product code is G45x55x4. (ID - 45mm, OD - 55mm, width - 4mm)
This is a Low Friction seal, which is important if replacing. The are commonly green in colour."
 
Schwany said:
I get a dribble out of my TTI gearbox after a ride. I do not put it up on a center stand. P11's never had one and my portable stand won't fit where I park the bike in its hidey hole in the garage. Side stand is on a block and the bike is almost straight up when parked. Oil is filled to midway up the kickstart shaft. My rear chain is not run tight ever and neither is my clutch belt.

Anyway, does anyone know the specs for the seal for the case behind the sprocket? Since TTI doesn't provide a damn bit of information about their gearboxes (to me anyway), I'm going to call it a sleeve gear or mainshaft seal. I sent a request to TTI asking about the seal, but I probably won't hear back for a month or possibly never. It's race season and they are probably busy.

I realize I may be the only one participating in this forum that has a P11 with a TTI 5 speed box. Hence I am mostly talking to myself. Nothing new regarding what I have done with the P11. I'll probably post a version of this in the Commando forum and be ignored there as well. :)

Vaughan at TTI got back to me already with the seal spec. Impressive response time.
Click to expand...
I have roughly 25 bikes we've built with TTI gearboxes here in the shop. Don't think we've ever had a leak where you're talking about. However, one bike did have the lip on that seal damaged when the spacer wasn't fit properly (briefly) during a sprocket change. Fitting a new seal, same as Vaughan mentioned, took care of that issue.

These boxes are more beautiful on the inside than you can imagine. And easy to work on. Cassette style with drum selector. You can remove that sprocket and pull the whole unit out to inspect, and refit, in between practice sessions. Nothing but good things to say about TTI

Let me know if you ever need stateside assistance.

-Kenny
 
Holmeslice said:
I have roughly 25 bikes we've built with TTI gearboxes here in the shop. Don't think we've ever had a leak where you're talking about. However, one bike did have the lip on that seal damaged when the spacer wasn't fit properly (briefly) during a sprocket change. Fitting a new seal, same as Vaughan mentioned, took care of that issue.

These boxes are more beautiful on the inside than you can imagine. And easy to work on. Cassette style with drum selector. You can remove that sprocket and pull the whole unit out to inspect, and refit, in between practice sessions. Nothing but good things to say about TTI

Let me know if you ever need stateside assistance.

-Kenny
Click to expand...
The TTI 5 speed is a big improvement over the AMC box. Once I figured out how to get the feel for finding neutral and installing a 3 piece clutch pushrod for the RGM clutch, the TTI box transformed my old Norton into a modern shifting motorcycle. The old thing runs really strong and is for the most part everything I ever expected to get out of a pre-Commando 750 Norton twin.

You got a dyno out here in Seattle in a garage someplace. I'd like to find out how delusional I am about my tuning skills. lol
 
Schwany said:
The pre-Commando AMC gearbox that was on my P11 is not vented unless you count the clutch pushrod hole through the mainshaft. I added a vent, but it was a waste of time mostly.
Click to expand...
There is a vent actually. It's in the inspection cover. NV changed that into a vent at the inner g/b cover.

- Knut
 

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