Thundercat Pulling Away Issues - Clutch?

MAR5H7 · Nitrous Nuisance Joined: 23 Jan 2012 Karma :

Ok, Bike has been fine until past few weeks I started noticing something, when ever pulling away from a stand still, there is a horrible grinding noise from below, bottom of the engine and it judders horribly, then when it gets going, the grinding stops and runs like she should, beautifully

Its only at stand stills

Starting her up, shes fine, idles fine, everything is fine, just pulling away, thats why im thinking clutch

Shes at 42k miles, not sure when the plates have been changed (if at all) any help will be highly appreciated

Thanks for hearing me out
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Ex: CBR 125 R 06', ZXR 400 96' (RIP), Bandit 650 06'
Owned: SRAD 600 97'
Current: YZF Thundercat 600 96'

Walloper · Super Spammer Joined: 24 Feb 2005 Karma :

Have you got a rear hugger on the back. It may have worked lose and is resting on the tyre when you pull away.
Or the exhaust pipes are touching the fairing.

Or something.
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W-ireless A-rtificial L-ifeform L-imited to O-bservation P-eacekeeping and E-fficient R-epair

MAR5H7 · Nitrous Nuisance Joined: 23 Jan 2012 Karma :

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

I take it your sprockets are ok.

Check that all the engine mount bolts are tight.

Walloper · Super Spammer Joined: 24 Feb 2005 Karma :

MAR5H7 · Nitrous Nuisance Joined: 23 Jan 2012 Karma :

dangerousdave · Traffic Copper Joined: 22 Apr 2011 Karma :

dangerousdave · Traffic Copper Joined: 22 Apr 2011 Karma :

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1988 Kawasaki KMX 200

Previous: Yamaha YZF1000, ZZR600, KMX200, DT50, KX80, CG125, PF50

dangerousdave · Traffic Copper Joined: 22 Apr 2011 Karma :

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1988 Kawasaki KMX 200

Previous: Yamaha YZF1000, ZZR600, KMX200, DT50, KX80, CG125, PF50

MAR5H7 · Nitrous Nuisance Joined: 23 Jan 2012 Karma :

weasley · World Chat Champion Joined: 16 Oct 2010 Karma :

Sounds about right oil, assuming 10W-40 or similar.

My clutch 'grabs' with a brief groan if I do a high rev launch and let the clutch out aggressively, so I don't do it. I've ridden it all over the place, including a track day and it never shows up in normal riding. I keep meaning to put a new clutch in it to see if this helps, but 10 years later I still haven't got around to it. Mine's on about 25-ish thousand miles but is 15 years old now.
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~~Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT~~ | BMW F900XR TE

dangerousdave · Traffic Copper Joined: 22 Apr 2011 Karma :

steady eddie · Nova Slayer Joined: 03 Sep 2006 Karma :

Have a look on https://www.bikersoracle.com/thunder/forum/forumdisplay.php?f=27&order=desc&page=4

there's a wealth of info on there Wink

I'm sure it's something to do with the grooves on the clutch basket wearing and not releasing the plates properly, mine used to judder / kangaroo / bog down if you tried to pull away with too many revs
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Fz50>Ts185>Rd125Lc>Cb250n Superdream "Deluxe" (!)>Kmx200>Tdr250>Yzf600 Thundercat>
Current bikes: 1997 Fireblade RRV & 1989 KMX200

P. · Red Rocket Joined: 14 Feb 2008 Karma :

MAR5H7 · Nitrous Nuisance Joined: 23 Jan 2012 Karma :

weasley · World Chat Champion Joined: 16 Oct 2010 Karma :

The valve clearance check is at 42,000 kilometres, that's 28,000 miles - it should have had at least one check by now. Many people I know with Thundercats (and I know many people with them!) have had them checked and never needed an adjustment. I had mine done last year and it needed 3 shims changing.

Your "to-do" list looks good, but be prepared for lots of swearing when it coming to bleeding the brakes, as they tend to be a bit tricky to get the last air bubbles out (the link pipe across the calipers is often blamed for this). Make sure you have plenty of fluid available.
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~~Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT~~ | BMW F900XR TE

MAR5H7 · Nitrous Nuisance Joined: 23 Jan 2012 Karma :

steady eddie · Nova Slayer Joined: 03 Sep 2006 Karma :