Rear Wheel lock up F4 1000r - MVAgusta.net
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post #1 of 28 (permalink) Old 06-30-2016, 01:12 AM Thread Starter
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Rear Wheel lock up F4 1000r

Hi Guys, I'm after some guidance

On my way home today from the mechanic (for a roadworthy certificate) and the bike is running great, about 200 meters from home coming down a hill and my engine stalled and rear tyre locks up, not sure which happend first as I was otherwise occupied trying to keep her upright. I don't mind telling you it scared the [email protected]#K out of me ! I go to restart the bike and she turns over but the rear wheel is still locked and will not move. I had to manhandle her to the side of the road.

I walk home to call a tow truck and come back to wait for it, all in all about 20-25 minutes, and I think i'll just try again and bingo she is running and the rear wheel is free. I rode her slowly home without any signs of trouble, But i'm really keen to find out what caused this lockup.

I'm thinking 1) side stand switch issue but would that lock up the rear wheel ? 2) some sort of gearbox issue ? 3) rear hub issue although I have no lateral movement in the rear wheel.

Am I on the right track here, is there anything else I should be considering?

All input is greatly appreciated, I would like to be sure the problem is sorted before I go out again on her.

George
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post #2 of 28 (permalink) Old 06-30-2016, 02:05 AM
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Hi George, very glad you didn't drop it mate.
Look, in my opinion it's nothing to do with side stand switch or anything electrical if the wheel was locked and you tried to roll the bike with clutch lever pulled in. You tried that right ?
With the bike running again, I'd say it is/was a gearbox issue, if it was the hub that locked it up there'd be shit all over your rear rim, but worth checking wheel rotation with rear wheel off the ground.

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post #3 of 28 (permalink) Old 06-30-2016, 02:59 AM
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Blimey, That's a bit scarey. You weren't hurt which is good news.

Just a suggestion, Did your back brake seize on ?
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post #4 of 28 (permalink) Old 06-30-2016, 03:06 AM
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Good one Joe, and then cooled down and released.

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post #5 of 28 (permalink) Old 06-30-2016, 05:21 AM Thread Starter
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Thanks for the reply Guys,

The back brake Seizing did occur to me Joe, but given that my back brake is almost non existent i discarded that idea but I will certainly look into it now. How can I check the rear brake for binding, as normally its only good for holding the bike at traffic lights ?

Donsy, no rear wheel rotation issues with the wheel off the ground, I did try to roll the bike with the clutch lever pulled in immediately after I stopped...no movement at all, I could change gears up and down but couldn't find neutral (that may have been the adrenaline rush I was having at the time). Why would the gear box be locked and 20 minutes later free up ? If I pull the Gearbox, what should I be looking for that could cause this ? Transmissions are not my strong point. by the way, I hope the recovery is going well mate.

thanks fella's I appreciate all the advice I can get

George
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post #6 of 28 (permalink) Old 06-30-2016, 01:12 PM
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I'm with Joe on the rear brake locking on. Sharon had the same problem on her old Brutale S. Exactly the same symptoms you had. Had to have a new rear master cylinder fitted (luckily under warranty!).
When was the brake fluid last changed, and when was the rear caliper cleaned thoroughly??? You can also check for slight "blueing" on the rear disc.
Hope you get it sorted mate.

Dave.

Last edited by Madjock; 06-30-2016 at 01:15 PM.
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post #7 of 28 (permalink) Old 06-30-2016, 04:43 PM
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ABS system mess up?? I had a friend on a BMW that had an ABS problem on a trip that held the front brakes on, cooked the front rotors so bad they had to be replaced. I've personally had it happen on a car as well (BMW 525), something went wrong in the ABS system and applied brake by itself, I waited on the side of the road for a bit and the brakes freed up.. Just an idea.


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post #8 of 28 (permalink) Old 06-30-2016, 04:45 PM
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Have you removed the chain yet to eliminate rear hub and brake.


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post #9 of 28 (permalink) Old 06-30-2016, 04:49 PM
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Wink ?

Brake pushrod is too long, closing the return port and locking the brake.....

Letting it cool allowed wheel to move

Cooling won't affect trans or hub



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post #10 of 28 (permalink) Old 06-30-2016, 04:55 PM
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Quote:
Originally Posted by theknurl View Post
Brake pushrod is too long, closing the return port and locking the brake.....

Letting it cool allowed wheel to move

Cooling won't affect trans or hub


Too long? Did it start growing?

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