jimmyjonga
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| posted on 26/11/05 at 06:53 PM |
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BEC slipping clutch help please
hi
my zx9r engined vortx clutch slips as soon as i give it 1/2 throttle or more.... what is the best way to solve it?
1- just put new clutch plates in it
2- new std clutch + uprated springs
3- uprated clutch + uprated springs (eg ebc street racer kit i have seen)
also how tricky are bike clutches to change? never tried it before...
thanks
james
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Mad Scientist
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| posted on 26/11/05 at 06:57 PM |
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Clutches are easy to change but i've never done it with a bike engine in a car. Sometimes need a special tool to undo clutch.
AB performance told me the other day that EBC uprated springs aren't good enough. He said i'd need Extra heavy duty springs for my blade
engine. Don't know if they could help you but they are worth a try.
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ChrisGamlin
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| posted on 26/11/05 at 07:01 PM |
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The good news is that bike clutches are a doddle to change, an hour or so and you're all sorted.
Im not sure if there are any specifics with ZX9s but generally Id suggest new friction plates as an absolute minimum, plus check the steel plates for
blueing / warping because if they are also gone then there's no point in just putting frictions in.
As to springs, some uprated springs would be a good idea although from expeirnec with their parts for blades, I personally wouldnt recommend EBC for
springs. The springs (for the balde at least) seem to very quickly lose their resistance so soon (ie in a couple of hundred miles) end up shorter /
weaker than standard items. The best springs I found were the Barnett ones (from PDQ) although how that translates over to ZX9s Im not sure. The EBC
frictions are OK, more grabby than OEM Honda plates but half the price. If the price diffeence isnt huge I'd probably go with genuine Kawasaki
parts unless you can get some good recommendations of alternatives.
You'll probably need a clutch cover gasket when you do it don't forget
Chris
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ChrisGamlin
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| posted on 26/11/05 at 07:04 PM |
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Mad Scientist, Andy's right about the EBC springs, he uses the Barnett ones too.
You only need a special tool if you're changing the whole basket, and if you've got an impact wrench handy you don't even need that,
as all the tool does is hold the basket still whilst you get a breaker bar on the retaining bolt. Just changing plates you wont need this though.
Chris
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Andy W
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| posted on 27/11/05 at 10:15 AM |
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Hi
I bought the EBC ones, what a load of of sh**, slipped as bad as standard. I now have barnett springs on a standard clutch, which seems fine
Andy
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RichieC
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| posted on 27/11/05 at 10:53 AM |
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Is there a cheaper way to fit coil springs to those bike engines which have diaphragm type springs? (early R1 etc).
Barnett do a conversion, but theyre about 120 quid plus clutch material.
Rgds
Rich
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ChrisGamlin
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| posted on 27/11/05 at 11:41 AM |
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Hi Rich
Unless you machined something up yourself, there's not really another option to be honest as you need to replace the entire front pressure plate
in order to use springs.
I guess the only other possibility would be to find another bike's pressure plate that would fit, ISTR that someone said that the Fazer 1000 had
springs so its possible that would fit?
Chris
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RichieC
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| posted on 28/11/05 at 01:00 AM |
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Hi Chris,
Yeh the Fazer had springs rather than a diaphragm. I wonder if its a direct swap, interested if anyone knows.
Also, is there much point in doubling up on the diaphragm springs? Ive heard that can make a nice improvement.
Rgds
Rich
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ChrisGamlin
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| posted on 28/11/05 at 01:13 AM |
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Didnt try the double diaphragm spring, I went straight to the Barnett conversion, but Ive heard that the double diaphragm works well too.
The Fazer is very similar to the R1 so its possible that it will fit, might need a complete basket swop though possibly?
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RichieC
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| posted on 28/11/05 at 01:15 AM |
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Yeh, sit might wel do.
Had a trawl about but cant find anyones experiences of adding another diaphragm.
Ill investigate the Fazer swap a bit more closely.
Rgds
Rich
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ChrisGamlin
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| posted on 28/11/05 at 02:01 AM |
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Im pretty sure Jim Giblett and Paul Rogers have done this mod in the past, to name but two.
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RichieC
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| posted on 28/11/05 at 11:45 AM |
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Cheers Chris, I think the better option is to swap out for coil springs if it wasnt for the £120 tag, Id do it (sometimes come up cheaper on eBay
though)
Rgds
Rich
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progers
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| posted on 28/11/05 at 02:37 PM |
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Nah, I went straight for the Barnett conversion, great minds think alike eh ?!
- Paul
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RichieC
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| posted on 28/11/05 at 02:39 PM |
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Big difference? Does it justify the £££?
Rgds
Rich
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ChrisGamlin
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| posted on 28/11/05 at 03:28 PM |
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Ah sorry Paul, I thought you did the extra spring mod on your old engine.
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progers
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| posted on 28/11/05 at 03:58 PM |
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I did it really for peace of mind as I was building a trackday car so the last thing you want is to shell out £150 for a trackday and then have
problems with clutch slip. It has certainly worked well. Feedback from others suggest the barnett conversion gives a more progressive (linear) feel to
the clutch. Its subjective whether or not you feel its worth the ££, as by all accounts doubling the spring (or buying a stronger spring from Yamaha
racing) works well too.
Cheers
Paul
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jimgiblett
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| posted on 28/11/05 at 05:52 PM |
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Yep doubled spring on mine. Works fine for me 
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