GRiSO 1100 locked gearbox

Hi guys,

I had a small accident lately, the motorcycle fell to the right side. After lifting damage turned out to be minor, unfortunately the gearbox got stuck in fourth gear.
I will try to disassemble it at the weekend, but I don't have access to special tools that open the box. The new ones are horendally expensive is the purchase of these tools unavoidable? They look like a regular screw impression tools, I am thinking about welding such a tool. What is the principle of these tools, what should I know before I break something.

Any help is appreciated.

Don't see how that is possible.
1. Sit on bike.
2. Rock it back and forth.
3. While simultaneously prodding the gear lever downwards until you arrive in neutral.

I can't believe it either. I tried to change gears by swinging the motorcycle as well as while driving with/without a clutch. I returned 50 km after the accident with blocked gear. From outside everything looks good, the lever and the rod are untouched (the motorcycle fell on the right so it could not be other). I suspect a shock or jerk when falling could damage preselector or shift cam

Look for a stone or some other debri that has wedged in the shifter mechanism.

I too find a locked gearbox highly unlikely. The six speed boxes used in the CARC bikes and Cali 1400's have proven to be virtually bulletproof. Before tearing it to bits I'd be checking it's ability to select at every stage of the removal process. I'd make a wager that at some point during the process something will have tension relieved on itor, as Wayne suggests, a stone chip will drop out and it will start selecting cleanly again.

Pete

I have twice seen a stone, stop both a BMW and a Guzzi clutch from operating, look very closely at all the linkages behind the gear box. Are all the drain hoses secured properly in their correct locations?

I'm amazed that you rode 50k in 4th gear, starting off must have been a great exercise in clutch control.

Pete Roper wrote:

Before tearing it to bits I'd be checking it's ability to select at every stage of the removal process. I'd make a wager that at some point during the process something will have tension relieved on itor

Maybe I didn't make myself clear - lever goes all way up and down but it does nothing. I don't feel anything strange when trying to change gear, one thing there is no 'click' at the end.

ghezzi wrote:

look very closely at all the linkages behind the gear box. Are all the drain hoses secured properly in their correct locations?

What linkages and hoses do You mean? There is only breather hose, drain and oil plug in gearbox all looks fine. One hose was cut off during the accident (as i marked on diagram), but I don't think it has anything to do with gearbox.
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I'm afraid that I disassemble the motorcycle too quickly or found this forum too late
For now the swingarm is removed and the engine accessories are disconnected, when I pull out the gearbox I will try to play with it and check if I can change gear. There may be a problem with the drive shaft because it's stuck on the gearbox output rack, what You think can i use a force to pull it out?

Use a brass hammer, or get a friend to pull on the shaft while you use a block of wood and hammer.
One good knock and it will pop off. It has an internal spring clip.

That hose is located very close to the gear shift linkages, if it got cut then something must have moved from its normal position.

Are the gear lever and any of the linkages bent? Can you take photos of these?
If the bike did not fall on this side, the only force that could have been applied to the mechanism is from your own foot.
Was this a single vehicle accident or did the bike collide with any other solid object after you fell off?
What gear were you in before the accident? How do you know it is in 4th gear now?

"lever goes all way up and down but it does nothing"
Is that moving ONLY through its normal range, or does it go much lower/higher?
At the end of its travel, does it feel like a hard stop, or does it feel rubbery?

I pulled out the gearbox here is the movie how it works (doesn't work - I don't have a tripod so I had to hold the camera in my teeth sorry for that). Gearbox is empty I drained the oil before removing it.

ghezzi wrote:

Is that moving ONLY through its normal range, or does it go much lower/higher?

I think the range is smaller, lever stops just before the place where gear should change.

Well it's certainly a weird one.

With the pullers one screws into the three holes for the slave cylinder of the clutch, the other one clamps around the output shaft flange that the boot goes around. You then wind them down to split the cases.