Clutch - concerned... - MVAgusta.net
 
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post #1 of 6 (permalink) Old 07-19-2016, 07:14 PM Thread Starter
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Clutch - concerned...

Hi all,

I tried searching on the forums and can't find this being discussed -sorry.

Under hard acceleration from stand still my MV F4 (2015 with 3000km on the clock) will violently lurch forward.

I though it may be TC kicking in - turned it off. Nope same issue. I would slowly engage, it would suddenly disengage, kick forward hard, completely disengage, etc etc until I reduce the throttle and go bit more gently.

Usually happens when the rpm's are above ~5.5k and speed is under 20km/h.

I used to be able to take my RS250 up to 12k easy and slowly engage to point where the front is feathering the ground. With my old '07 R1 no issues as well.

Any suggestions, ideas, tips etc appreciated.

Last edited by aprilia_rs250; 07-19-2016 at 08:13 PM.
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post #2 of 6 (permalink) Old 07-19-2016, 07:23 PM
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Yes, that sounds very much like the MV clutch charatiristics, sorry to see they've carried it over to the new models too.
I have no advice, other than practice and installing a improved clutch system.

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post #3 of 6 (permalink) Old 07-20-2016, 08:09 PM
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I saw that on a "on two wheels" episode when they tested a current F4 and it took off and choked like a bull having a fit. I am not a fan of hard launching so I haven't confirmed any of this.

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post #4 of 6 (permalink) Old 07-21-2016, 04:21 AM
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Had this problem with the 1078. Hard launch was more kind of rodeo ride.
I installed another slipperclutch and slave master cilinder and it is solved.

What a beast of a motorcycle!
It growls and rages and flies across the tarmac like a wild animal that has escaped the confinement of a cage and after merely waiting restlessly until the release, will not endure being locked up ever again.


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post #5 of 6 (permalink) Old 12-12-2016, 10:18 PM Thread Starter
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Hey guys, I've saved up enough money to buy a new clutch system. Can you recommend any brand or know of any brand for a +MY10 F4 that is reliable and won't cause hard launch spasm issues? i.e. what do you use (MV Corse, EVR, STM etc?). Do I also need to get a master slave cylinder?

Or, even better, is there a way to modify the current clutch system? What is actually causing the bike to jerk like that...?

Also I'll have to pay someone to install this, please don't tell me it's easy.

Last edited by aprilia_rs250; 12-12-2016 at 10:20 PM.
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post #6 of 6 (permalink) Old 12-13-2016, 02:56 AM
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Quote:
Originally Posted by aprilia_rs250 View Post
What is actually causing the bike to jerk like that...?
I've not experienced that on my F4, I assume that the problem is similar to the issues the Suzuki GSXR 1000 K1 thru K4's had.

At high rpm the GSXR launches where erratic and often skyward as the initial bite was far too short and aggressive. If I recall there were lots of theories about oil supply etc, but the fix was to ditch the wave washer arrangement from Suzuki and fit the ZX10R Clutch cushion plate. In essence it acts like a cush drive for the clutch. Just search for "gsxr k1 k2 clutch grab" and you can read up on it.

I donít know if the F4 shares it clutch plates with anyone else, and if so do they have a similar cush drive available.

As you have to back off before you regain drive, I assume that the slipper clutch may be disengaging somehow due to the violent snatch and grab of the initial clutch bite?

Is there any chance that clutch stack height may either reduce or increase the tendency for the behaviour?

Cheers

----------------------------------------
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ECU Re-Mapped with ECU studio (F4 RC base ROM)
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