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 Post subject: Normal Clutch Action for F1?
PostPosted: Sun Jan 15, 2017 4:34 pm 
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Joined: Mon Jul 11, 2016 8:44 pm
Posts: 94
Location: Atlanta
Please pardon this noob-ish question, but I am only now getting my F1 sorted. Today I got the brakes working. Important things, brakes. ;)

Is it normal for the standard 750 dry clutch to engage with the lever almost all the way to the handlebar?

Is it also normal to have very little engagement travel?

Is a slight screeching noise when first engaged (from cold) normal?

I bled the system to death after replacing the center of the clutch and am reasonably confident there is little if any air trapped inside. I also cleaned up the clutch plates and discs while the clutch was apart. Some of the motor-side plates were slightly blued and there is a small crack starting to develop in one of the metal discs, but the clutch seemed in reasonably good condition. The springs were equal height and appeared to be okay.

I am used to the dry clutch in my Morini, but it at least has slightly more travel. The F1 clutch seems less than I would expect, but this is my first F1.

TIA


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 Post subject: Re: Normal Clutch Action for F1?
PostPosted: Mon Jan 16, 2017 10:20 am 
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Joined: Mon Oct 04, 2010 7:47 am
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TIA,

Are all the components original to the bike? Different years had slight dimensional variations. I have seen differences in the clutch slave cylinder bore diameter which can have the affect of you engagement or if the clutch master cylinder bore size can cause the issue to.

Palmer


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 Post subject: Re: Normal Clutch Action for F1?
PostPosted: Mon Jan 16, 2017 12:39 pm 
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 1803
You replaced the hub, some plates are blue, and you saw some cracking in one; that does not sound like the clutch is in good condition to me. How many miles, and how many mechanics has your bike been through?

The entire pack may be worn down, a plate might be missing, or a thicker plate is needed. You should find a total stack thickness of around 33mm to start with, and about 4 or 5 mm space below the big keeper ring once all components are installed and there is pressure. If the stack is notably thinner then it will take longer for the plunger to engage; instantly the lever is closer to the grip!

MikeV

To answer your question, no, those symptoms are not normal for an F1.


Last edited by 618F1 on Tue Jan 17, 2017 1:34 pm, edited 1 time in total.

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 Post subject: Re: Normal Clutch Action for F1?
PostPosted: Mon Jan 16, 2017 7:24 pm 
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Joined: Mon Jul 11, 2016 8:44 pm
Posts: 94
Location: Atlanta
618F1 wrote:
How many mechanics has your bike been through?


Good question. I wish that I knew. The bike has a bit more than 27k kilometers. Don't know if the clutch was ever replaced.

As far as I know, the clutch cover and slave cylinder are the original items.

Might be time to get a new clutch pack...

Thanks!


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