Clutch Service Advice Needed

[JGY6000]

Hi all,

I have a Yamaha YZF 600 R Thundercat

I picked up the bike a few weeks ago and noticed on the ride home the clutch was slipping high up in the rev rage for a few seconds and when would bike again. Not all the time but once in a while.

Anyway i have had a look at the clutch friction plates and they are all within the service limits stated in the Haynes manual, as are the metal plates also. I measured them very accurately with a vernier calliper. Also visually they seem in very good condition and dont look worn out at all.

I then measured the 6 springs (3 short & 3 Long) and all of them are below the service limit stated in the Haynes manual. Would this alone cause the clutch to slip?

At the moment im thinking what's the best route to take

(1) get a complete clutch kit (friction plates/metal plates/springs) for £120

(2) Get the friction plates and springs only for £85

(3) just get the springs for £10 as they seem to be the only parts that are not within the service limit stated in the manual?


The oil when i drained the engine was fairly clean, so im assuming the previous owner did an oil change not that long ago, but i cant be sure what oil he used, as if he used car oil then the friction plates might be contaminated and this might be where my problem lies

Its also possible looking at the friction plates that these have been changed in the past but they haven't changed the springs at the same time



Thanks
____________________
Previous: Peugeot Speedfight 50, Gilera Runner 172, Gilera Ice 70, Gilera Runner 200, Suzuki Bandit 600, Honda Cub90 Yamaha YZF 600 Thundercat
Current: Looking for a commuter bike/ scooter

[yen_powell]

Car oil used or clutch cable incorrectly adjusted?
____________________
Blackmail is a nasty word........but not as nasty as phlegm!
XT1200Z and a DR350 in bits

[JGY6000]

Clutch cable is fine, perfect amount of free play
____________________
Previous: Peugeot Speedfight 50, Gilera Runner 172, Gilera Ice 70, Gilera Runner 200, Suzuki Bandit 600, Honda Cub90 Yamaha YZF 600 Thundercat
Current: Looking for a commuter bike/ scooter

[serlant]

for £10 just try some springs, if it doesn't fix it its not like you've gotta throw em away so just buy some friction plates then.
____________________
04 CBR1000RR, 1995 Husqvarna TE410, 1998 VTR1000(Sold), 1990 XJ600(sold), 1996 KH125(dead and sold)

[0l0dom0l0]

Do an oil change (as I think you have already) as its possible the oil was no good.

If that doesn't do it, do the springs.

You shouldn't need to replace the plates if they are within service limit, but it is possible they have been contaminated.

Best thing you can do is go to Wilkinsons, and buy yourself a 5 litre bottle of 10W40 semi synthetic oil. Do 2 oil changes about 200 miles apart.

Then go to Halfords and buy some Castrol 10W40 and get yourself an oil filter too. Then do an oil and filter change, with the springs too.

Hope that helps!

[andym1968]

I have heard using some fully synthetic oils can cause clutch slip on certain models, so it may be a possibility. BTW, £85.00 seems a bit steep for just friction plates and springs.
____________________
<a href="https://www.patternparts.net">Motorcycle parts</a> from PatternParts Ltd

[JGY6000]

I have decided to do the springs first along with an oil change and then take it from there

If this doesn't solve it then i can assume the friction plates are contaminated and change them
____________________
Previous: Peugeot Speedfight 50, Gilera Runner 172, Gilera Ice 70, Gilera Runner 200, Suzuki Bandit 600, Honda Cub90 Yamaha YZF 600 Thundercat
Current: Looking for a commuter bike/ scooter

[CaNsA]

Soak the existing plates in the correct oil for a few days.
Stirring the oil twice a day atleast.

that should help, maybe.

[mattsprattuk]

[JGY6000]

Hi Guys,

I have fitted new springs, a new set of clutch friction plates and filled up with some Castrol bike oil, all good there BUT i have no clutch now at all. Theres no resistance in the lever at all it just goes in and out without moving the clutch at all

I do remember pressing the lever when the clutch was apart so im guessing this is where i have mucked it up. any ideas where i need to start looking?

Thanks
____________________
Previous: Peugeot Speedfight 50, Gilera Runner 172, Gilera Ice 70, Gilera Runner 200, Suzuki Bandit 600, Honda Cub90 Yamaha YZF 600 Thundercat
Current: Looking for a commuter bike/ scooter

[HD]

What you mean it is constantly on? As if the lever is in but its out and you can change through the gears and the wheel does not spin?

Or the opposite?
____________________
Rusty '02 Vito Camper + CBR600F3

[N cee thirty]

adjust the lever and cable...
____________________
'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[JGY6000]

sorted, took the pressure plate off had a look, put it back on, cant work out what the difference was but its now working
____________________
Previous: Peugeot Speedfight 50, Gilera Runner 172, Gilera Ice 70, Gilera Runner 200, Suzuki Bandit 600, Honda Cub90 Yamaha YZF 600 Thundercat
Current: Looking for a commuter bike/ scooter

[HD]

Well I imagine it was what I said.

I did my clutch once and you have to match up a notch on the hub with one on the crankcase (i think it was). If you didnt, it was like the clutch was permanently on :/
____________________
Rusty '02 Vito Camper + CBR600F3