Yamaha Thundercats
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Dougal needs Help

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Dougal needs Help Empty Dougal needs Help

Post  0ldcat on Thu Aug 04 2011, 17:22

Hi Folks,

Dougal posted the following in the chatbox, but unless you access the archive chats yer not gonna see it.

dougal wrote:[14:51:15 04/08/11] dougal : Hi All, Wonder if anyone can offer any pointers please ? I recenlty bought a Thundercat which has been absolutely brilliant for the first 1.5K however it has started to play up. It starts from cold perfectly and then as soon as it starts to warm up starts misfiring/running on 3 cylinders and cutting out. I have had the carbs cleaned and new plugs fitted and the problem went away for a week but it's back again. Any ideas on what to check /replace ? Thanks.
Can anyone help ? Got any ideas ??

cheers clink
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Dougal needs Help Empty Re: Dougal needs Help

Post  Huw on Thu Aug 04 2011, 18:23

I don't know the Cat well enough yet, but as the problem was cured for a short while after disturbing the plugs and carbs, I'd say check the plug caps and leads. not sure what sort of coil or igniter set-up these have but that would probably make it run on two not three and be a problem from start up.
Perhaps vacuum hoses split? Sounds more like a carb/ mixture fault if it won't run warm.
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Post  weasley on Thu Aug 04 2011, 18:42

I had a similar issue and it turned out to be a plug cap; they just unscrew from the end of the HT wire. You can test the resistance across them; they're supposed to be 10k Ohms. They're not cheap though - I found a set on eBay.
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