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03-15-2003 09:34 PM  14 years agoPost 1
helicrazysteve

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United Kingdom

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90 Size upgrade clutch broke a shoe today,anyone else had a problem? running 7.5:1 ratio and running a 1800 head speed with a GV 1. (OS 91 SX )

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03-16-2003 12:20 AM  14 years agoPost 2
wilsonj

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Waikerie, South Australia

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I have broken one also. But I put it down to a too large a clearance between the shoe and the lining.

How is yours??

Regards

Jamie

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03-16-2003 11:48 AM  14 years agoPost 3
helicrazysteve

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United Kingdom

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Its not clearance i`m sure,and i`m going to put the 60 clutch back in.if you look at the two clutches the hole is the same distance from the edge so offering no extra strength in my mind.

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03-16-2003 03:48 PM  14 years agoPost 4
Ron Cosby

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Shreveport, Louisiana

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I installed an 90 clutch and a new bell, it tries to engage at idle. I thought it might get better over time, but it really hasn't improved much. Has anyone else had that problem?

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03-16-2003 05:00 PM  14 years agoPost 5
helicrazysteve

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United Kingdom

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mine starts to engage at just over 1000rpm according to the GV1,flew it today and the GV 1 has packed in...not a good weekend.

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03-16-2003 09:39 PM  14 years agoPost 6
wilsonj

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Waikerie, South Australia

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HelicrazySteve,

Even though the hole is in the same position, if you check the rim thickness on one side it is thicker. I think by about 1mm or so. I did measure it, but can't remember.

Bummer about the GV-1

I also don't think the clutch can be blamed for engaging too early. Alignment of the whole clutch/bekk assembly can be tricky. And if not done right the clutch will drag and engage early.

Regards
Jamie WIlson

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03-16-2003 09:48 PM  14 years agoPost 7
helicrazysteve

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United Kingdom

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thanks for the input.can`t see any difference in the wall thickness at the hole area in my clutches,must admit the wall area machining is about 1mm larger but the pivot area around the hole is the same.l feel it may be just a dodgy unit but i`m going to see how long the stock 60 clutch lasts.

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03-16-2003 09:53 PM  14 years agoPost 8
wilsonj

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Waikerie, South Australia

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maybe you had a dud? Mine was certainly thicker. I think I have it somewhere still. I will check again. Might be able to post a pic of it.

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03-16-2003 09:56 PM  14 years agoPost 9
helicrazysteve

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United Kingdom

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That would be good at least I would have a comparison..cheers.

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03-18-2003 12:33 PM  14 years agoPost 10
Roger Hamilton

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Surrey, England

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I've had 2 fail within 2.5 gallons.

Only had 1 60 version fail in 18 months. Awaiting Robbe comments

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03-18-2003 07:42 PM  14 years agoPost 11
helicrazysteve

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United Kingdom

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I wonder if we have got a bad batch, I have e-mailed Bob J and he hasn`t had problems..yet.I must admit i`m not sure.I`ve measured my 91 and 60 clutches and the hole distance from the rim is the same although the machining is different ,in my mind its no stronger.

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03-23-2003 10:45 PM  14 years agoPost 12
wilsonj

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Waikerie, South Australia

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HIya,

I have taken pics of my broken 90 clutch, but I don't think there is any point in posting them now. I re-read the posts, and even though the clutch wall is thicker, it is the same around the hole. Giveing no extra strength.

Now, thinking about it, I don't think the 90 clutch was ever designed to be "stronger". Only to engage better at lower RPMs, so as to stop the clutch slipping with the extra torque of the bigger motors. The only reason the wall is thicker is to add extra weight. If they then thickened the part around the hole they would be back to square one again!!

To make the clutch stonger it would have been a good idea to elongate the hole, increasing the area of steel that can flex. Therefore spreading the stress. Might be an interesting milling project? Should be able to elongate a 60 clutch hole, allowing more area to flex, and probably allow it to engage "harder". also. I wonder if Robbe even considered this??

Regards
Jamie Wilson

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