Gearbox or clutch problem ? - MVAgusta.net
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post #1 of 47 (permalink) Old 08-24-2015, 03:11 PM Thread Starter
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Gearbox or clutch problem ?

Hi I am fairly new to MV. I have had my 2014 F3 800 since April. I crashed at the track on a straight after what appeared to be my rear wheel locking up during downshift. Nothing makes sense other than the slipper clutch locking up as I wasn't even to the brake marker yet, let alone the turn. There were 3 witnesses that said it appeared my rear wheel had locked up. I didn't use my rear brake, and even the dealer observed the rear brake wasn't really even operating correctly.

I'm thinking this would NOT show up on a diagnostic as an error code? Has anyone had any issues like this? I was lucky to walk away without broken bones and only a jacked up suit, bruises, a sprained neck and a headache!

Any advice would be awesome! Thanks!
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post #2 of 47 (permalink) Old 08-24-2015, 06:01 PM
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Welcome to the forum, sorry about your crash and very glad to hear you're okay.

As for your problem, I'd say you had a gearbox problem rather than the slipper clutch.

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post #3 of 47 (permalink) Old 08-24-2015, 07:46 PM
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wouldn't the slipper clutch overide the gear box?! even if the engine sized the slipper should free the rear tire don't you think?
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post #4 of 47 (permalink) Old 08-24-2015, 09:38 PM
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no. The slipper clutch would not slip that much
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post #5 of 47 (permalink) Old 08-25-2015, 02:15 AM
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Why were you downshifting BEFORE your braking marker? Sounds like a recipe for disaster right there.

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post #6 of 47 (permalink) Old 08-25-2015, 05:02 AM
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Quote:
Originally Posted by number2 View Post
no. The slipper clutch would not slip that much
This is an interesting contention, Geroge. The slipper in my 2010 Brutale 1090 RR will absolutely overcome a stalled engine to allow the rear to spin, so it sould overcome a locked up gearbox.

I have tested this at 65 mph tying to "bump start" my Brutatle after I shut it off to reset the tach. The slipper just let the rear spin and the engine never turned over to allow a bump start.

It was all very smooth, too.

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post #7 of 47 (permalink) Old 08-25-2015, 05:17 AM
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It would definitely not stop my rear from locking up Chuck, but then I don't use the same slipper clutch as the 800's either.

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post #8 of 47 (permalink) Old 08-25-2015, 05:32 AM
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2 things 1st as per wikipedia encyclopedia "the slipper clutch can also prevent catastrophic rear wheel lock up in case of enging seizure" just google it like I did.
2nd I downshift before the braking markers.
If they had downshift markers where would they put them on the track? after the braking markers! How would that work?
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post #9 of 47 (permalink) Old 08-25-2015, 05:37 AM
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Did the google "testers" test a slipper on a F3 800, come on guys, no need to be fickle, try and speak from experience.

Where else do you downshift lefin, before you start braking ?

And while you're out there Googling, any idea's on how a slipper clutch get's stuck in that Wikipedia bullshit site.

If it where my bike and I know it's not rider error on my behalf, then I'd pull that motor apart and have a look at the gearbox and clutch basket.

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Last edited by Donsy; 08-25-2015 at 05:46 AM.
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post #10 of 47 (permalink) Old 08-25-2015, 05:45 AM
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Welcome to the family.....strange crash scenario!?!

If the transmission locks up the clutch would have nothing to do with it....the clutch is between the engine and transmission, not the rear wheel and transmission. The only thing between the wheel and gear box is the chain.

If there was a gearbox malfunction to cause the rear wheel to lock it would have to be something like engaging 2 gears at the same time. A fault that would be readily evident on inspection as it is near impossible without component failure.

The slipper clutch is there to allow the transmission to override the engine during decel so engine braking doesn't cause wheel hop/lock. if you downshifted too many gears or at too high a speed and the slipper clutch wasn't there the engine braking could cause momentary wheel lock up......before the wheel speed forced the engine into over rev with possible engine damage as a result.

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