Yamaha Thundercats
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Post  J.P on Sat Jan 10 2015, 20:25

Hi all
just bought my thundercat today
on the test drive everyting was fine but on the way home I stopped to fuel Up and when I set off again I noticed the speedo wasn't moveing
any advice or what to check would be great full
thanks
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Post  Jkillroe on Sun Jan 11 2015, 13:32

See if the speedo cable came out by the front wheel.happen to me once just before a speed camera lol. It just screwed back in
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Post  J.P on Sun Jan 11 2015, 14:51

Thanks mate il check that out
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Post  weasley on Sun Jan 11 2015, 15:54

The same happened to me, except the inner drive cable slipped out so I had to get a new one. Other causes could be a snapped drive cable or a knackered speedo drive on the front wheel. Start with the easy ones!
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Post  J.P on Sun Jan 11 2015, 17:22

Just checked and it seems tight down at the wheel . I noticed there's a few screws missing that holds fairing togetor were would I get replacements and this mite sound stupid but all my bikes had a sight glass to check oil how is it done on the thundercat ?
Thanks
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Post  FatCat on Sun Jan 11 2015, 18:19

You can identify parts from this thread.
https://www.yamaha-thundercats.org/t6242-genuine-yamaha-yzf600r-offline-parts-catalogue

the Cat has a sight glass for checking oil level on the right hand side, it's almost obscured by the fairing but not quite, Here is an image I found with a google image search.
speedo dial Window

It's possible to get kits to replace fairing bolts (if you want to replace them all) like these, or these.
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Post  J.P on Sun Jan 11 2015, 18:36

Thanks fatcat
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Post  Radar on Sun Jan 11 2015, 20:03

The speedo cable is the only fault I have had so far...

https://www.yamaha-thundercats.org/t7291-thundercat-has-a-problem
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Post  J.P on Sun Jan 11 2015, 20:20

Haha brilliant !!
I'm goin to strip the fairing tommorow and closer inspect everyting
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Post  Tee-Forty on Mon Jan 12 2015, 02:26

@J.P wrote:...all my bikes had a sight glass to check oil how is it done on the thundercat ?

That info' is also inside the Owner's Manual, if you don't have one here is a link for a pdf version.

click me


@J.P wrote:...I noticed there are a few screws missing... where would I get replacements...

If you're not bothered about them being original, eBay have a large choice. Stainless, aluminium, titanium, whatever your budget allows. Just take time to measure them first.
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Post  J.P on Mon Jan 12 2015, 05:25

Thanks tee-forty always good to have the manual
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Post  Wooster on Mon Jan 12 2015, 12:54

When my speedo went it was a stripped worm gear in the gear unit (they're made of plastic).

I thought I'd just bought a new one and replaced it, but all I can find now are whole gear unit assemblies. ponder
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Post  J.P on Mon Jan 12 2015, 15:36

Gear unit ??
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Post  SteveCat on Mon Jan 12 2015, 16:11

It is in the front wheel - the bit the speedo cable screws into. The early units were made of nylon, was 'upgraded' to brass later on. I've been through a few units, including the brass upgraded one - my suspicion in my case is it was manhandled by the tyre fitment place as the unit used to go wonky not long after a tyre change.

In the gear unit, there are two items - the gear gizmo itself, sadly not the cheapest item and a tabbed washer, called a clutch meter [think what is supposed to mean is a mechanical fuse for the speedo (meter) ]. This latter unit can break and is not very expensive (iirc a few £'s).

If you have an electric drill, put the bottom (front wheel end) of the speedo cable into the chuck - if the speedo moves then cable and speedometer unit OK and it's the gear hub or clutch meter.


Last edited by SteveCat on Mon Jan 12 2015, 17:38; edited 1 time in total
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Post  J.P on Mon Jan 12 2015, 17:08

Great advice thanks
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Post  J.P on Sat Jan 24 2015, 22:54

Well took speedo cable out and the end bit that goes into the wheel just fell out of cable looks snapped ?I'm guessing a replacement cable is needed
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Post  Tee-Forty on Sun Jan 25 2015, 03:05

Yep, looks like it!

They are usually under a tenner for a pattern part, quite a bit more for genuine Yamaha.
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