f4 750 clutch slipping - MVAgusta.net
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post #1 of 25 (permalink) Old 04-08-2014, 02:48 PM Thread Starter
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f4 750 clutch slipping

Right guys im here to pick your brains.

Took my f4 750 out for its first run of the year and the clutch is slipping when i get to 9500rpm in third gear and above. only happens above 9500rpm,

i'm assuming with the 750 not having a lot of torque thats why it will not slip earlier on in the rev range.

now the bike has sat previousily for 4 years, i have changed the oil and filter etc and bled the clutch. i rode the bike steady for 20 miles before opening it up properly.

Oil wise i am using rock oil fully synthetic as recommended by donsy.

I'm thinking with the bike sitting for so long the clutch plates have dried out possibly or the springs are weak.

Any ideas guys?
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post #2 of 25 (permalink) Old 04-08-2014, 02:51 PM
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Had exactly the same with my 750. Needed new plates and that was it. What is your mileage?

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.


Skye I miss you. L'essentiel est invisible pour les yeux.
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post #3 of 25 (permalink) Old 04-08-2014, 02:59 PM Thread Starter
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10,000 miles from new
my dad was the previous owner, never really pushed hard off the start etc.

I shall ring my dealer tomorrow and order springs and plates i think. Any idea how much they were?
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post #4 of 25 (permalink) Old 04-08-2014, 06:23 PM
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Well... Mine had around 17.000 km at that time so that does make sense. But... I pushed it hard at the time, even slipping the clutch to rev more, so that was not so good probably. I don't know what the costs were as my dealer was even so kind to replace the plates at his expenses By chance I just informed for my current bike and that would have been around €150,- for the set.

It would be good to be a bit more sure before you order. There some members here who are much more mechanically inclined and want maybe to add something

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.


Skye I miss you. L'essentiel est invisible pour les yeux.
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post #5 of 25 (permalink) Old 04-08-2014, 07:22 PM
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I think it's probably your springs. Remove them and measure them, Startwin can get you springs, I have new springs here but will have to check if they will work on your bike.
I also have various plates here for 750's which you can have if they still measure up okay, just pay shipping.

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post #6 of 25 (permalink) Old 04-09-2014, 12:21 AM
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Wink slipping?

shim your clutch springs and ride it.....


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post #7 of 25 (permalink) Old 04-09-2014, 01:12 AM Thread Starter
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What thickness shim would you recommend using?
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post #8 of 25 (permalink) Old 04-09-2014, 01:17 AM
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The manual will tell you how long the spring should be. measure them and work out the shim thickness accordingly.

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post #9 of 25 (permalink) Old 04-09-2014, 01:36 AM
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Wink

Quote:
Originally Posted by Donsy View Post
The manual will tell you how long the spring should be. measure them and work out the shim thickness accordingly.
add at least 1mm over what it takes to get back to stock minimum length.....

if the springs are very different in length, replace them

springs are cheap......a clutch pack isn't

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post #10 of 25 (permalink) Old 04-11-2014, 03:38 PM Thread Starter
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I removed the clutch pack the other day.
After measuring the spring they are shot I can only assume sitting dorment for 3-4 years has weakened them.

The clutch plates are worn below spec aswell.
Also the steels have some
Nasty burn/high spots.

Looking on pro italia's online parts catalog on the brutale 750(the f4 750 isn't listed) a set of plates,steels and springs comes in at around the $200 mark. Seems reasonable to me

I have contacted several dealers in the uk and having got no reply I am pretty frustrated as the weather is nice.

Now my question is does anybody know any good mv dealers in the uk that are helpful or shall I just order from pro italia?

Cheers Antony
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