2010+ F4 Grabby Clutch (possibly other models too) - MVAgusta.net
View Poll Results: Grabby Clutch
Clutch slips perfectly, can launch like the best 4 33.33%
Clutch engagement can be sudden and fast starts are not safe. 7 58.33%
Sometime ok sometimes bad. 1 8.33%
Voters: 12. You may not vote on this poll

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post #1 of 15 (permalink) Old 07-29-2019, 07:32 AM Thread Starter
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2010+ F4 Grabby Clutch (possibly other models too)

Just a quick question, how many F4 owners have found the clutch grabby? i.e at traffic lights if you use some revs for a fast start, the clutch will suddenly stop slipping and engage promoting an unintentional lurch wheelie etc. Saw another F4 bite the dust today doing (attempting) a fast start. He's not an owner on here, but soon to be.

May be applicable to other models too

----------------------------------------
2015 MV F4, ABS
ECU Re-Mapped with ECU studio (F4 RC base ROM)
QS & Blipper now working with ECU studio and Durashift sensor

others
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GSXR 750

Last edited by dansoarr; 07-29-2019 at 10:20 AM.
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post #2 of 15 (permalink) Old 07-29-2019, 05:06 PM
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Al Fagan mentioned this on 44 Teeth during the budget bike battle. He said a lot Ducati’s he raced had the same issue, he suggested around 2000 rpm and feed in the revs as you drop the clutch.
Otherwise it’s how you describe it.

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post #3 of 15 (permalink) Old 07-29-2019, 05:29 PM Thread Starter
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How's yours?
I've made some mods and I think I have cured the issue, time will tell.

Idea around the poll was too see if there is a common cause.

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2015 MV F4, ABS
ECU Re-Mapped with ECU studio (F4 RC base ROM)
QS & Blipper now working with ECU studio and Durashift sensor

others
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GSXR 750
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post #4 of 15 (permalink) Old 07-29-2019, 11:43 PM
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Mine is grabby. First time I tried to get a decent launch I almost launched it.
Doing as Fagan describes has helped.
How have you mitigated the issue.

2017 F4RR
Avio Grey/Black Carbon
EAS 2.0 Quick shifter/Auto Blipper
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post #5 of 15 (permalink) Old 07-30-2019, 12:57 PM Thread Starter
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Quote:
Originally Posted by MarkF4RR View Post
Mine is grabby. First time I tried to get a decent launch I almost launched it.
Doing as Fagan describes has helped.
How have you mitigated the issue.
I'll PM you and if the fix is the same for you, I'll post it up for others to see what I've done and feel better that it is a proper fix.

----------------------------------------
2015 MV F4, ABS
ECU Re-Mapped with ECU studio (F4 RC base ROM)
QS & Blipper now working with ECU studio and Durashift sensor

others
GSXR 1000
GSXR 750
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post #6 of 15 (permalink) Old 08-09-2019, 10:45 AM
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Hi Arron,
I do have this problem, but only before the engine (and clutch) are properly warmed up. It is fine after that.
Does yours do this even after your system has reached its normal operating temperatures?

C.

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post #7 of 15 (permalink) Old 08-14-2019, 03:02 PM
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To fix the clutch you must replace the stock clutch. Replace it with an STM clutch and you will get smooth engagement. I put the STM clutch on my 2013 F4 and it's great. The clutch cost around $1000.

An additional improvement is to get a 30 or 31 mm diameter clutch slave to give more lever travel and increase the ability to modulate the clutch.
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post #8 of 15 (permalink) Old 08-14-2019, 03:16 PM Thread Starter
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Quote:
Originally Posted by stephen3141593 View Post
To fix the clutch you must replace the stock clutch. Replace it with an STM clutch and you will get smooth engagement. I put the STM clutch on my 2013 F4 and it's great. The clutch cost around $1000.

An additional improvement is to get a 30 or 31 mm diameter clutch slave to give more lever travel and increase the ability to modulate the clutch.
Yes these are well know replacements, the question here is can we fix the clutch that came with the bike, not replace the clutch assembly with another design.

I have the EVR slipper clutch, but trying to prove a fix for the standard bike. Part of it is an engineering.challenge but also as a matter of principle having to spend beat part of 2k correcting poor designs on the MV is rather an irritation. Between the clutch and cush drive the F4 is let down.

The fix looks good, 2 bikes with same fix, I have another F4 to look at in September and one more that's going to get there's checked to.

Hopefully therefore we have a fix, and I'll document, post it up and then there no need to spend over 1k on replacement parts, unless you want too of course.

----------------------------------------
2015 MV F4, ABS
ECU Re-Mapped with ECU studio (F4 RC base ROM)
QS & Blipper now working with ECU studio and Durashift sensor

others
GSXR 1000
GSXR 750
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post #9 of 15 (permalink) Old 08-14-2019, 03:19 PM Thread Starter
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Quote:
Originally Posted by christosc View Post
Hi Arron,
I do have this problem, but only before the engine (and clutch) are properly warmed up. It is fine after that.
Does yours do this even after your system has reached its normal operating temperatures?

C.
Mine was like it all the time, regardless of the temperature. Do you fancy taking a look at your clutch? It might be the same issue, just a different degree of effect.

I'm down in Ross-on-Wye, I'm often in Langley / Uxbridge if you want a hand, I can bring parts to try to fix too.

----------------------------------------
2015 MV F4, ABS
ECU Re-Mapped with ECU studio (F4 RC base ROM)
QS & Blipper now working with ECU studio and Durashift sensor

others
GSXR 1000
GSXR 750
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post #10 of 15 (permalink) Old 08-14-2019, 03:30 PM
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