wilky Posted February 17, 2009 Share Posted February 17, 2009 hello to all im new to all this i have recently bought a r reg thundercet not run for two years done all that needed doing but its only firing on 1 2 4 it was firing on 3 4 at first but after blasting air through carbs it now runs on 1 2 4 i have spark on three and carbs have all been cleaned so theres no reason why fuel shouldnt be getting through any ideas Link to comment Share on other sites More sharing options...
Madison Motorsport Posted February 19, 2009 Share Posted February 19, 2009 Are you getting a spark to #3? It may be a dodgy plug or HT lead. Link to comment Share on other sites More sharing options...
fosdyke Posted February 19, 2009 Share Posted February 19, 2009 I assume from the post that you have a spark on ALL 4 plugs? If so then I would suspect lack of fuel to number three which could be blocked jet or a valve problem - I suggest you do a compression test. If you haven't got a suitable gauge then put your thumb over the plug hole - if there is a big difference in compression you will feel it. I had a similar problem with my GT550 couldn't figure out why it wouldn't pull fuel in 1&4 until I found the valve clearances were a mile out and the valves wern't closing - new shims and it's all sorted now - but it had me scratching my head for a while. Good luck. :D Link to comment Share on other sites More sharing options...
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