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Post Info TOPIC: Carb Problems


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Carb Problems
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Hi I am talking about an 04 blue tank model bike that I have had for 12yrs so it is not new to me. I am reasonably ok with practical stuff rebuilt engines etc . So my problem started when I came to take thebike out after a longish 1yr year of no activity. Starts up fine ticks over fine will rev up if throttle is opened slowly but if throttle is opened fast then the bike coughs and splutters as though it is starved of fuel or over fuelling. carb stripped down and rebuilt several times, new standard jets, and needle, new diaphragm set up, new  float valve, fuel height ok, so basically new carb bits all round. Still the problem exists. I have tried the needle in all 5 positions with both 137 and 147 jets and still the problem is present. Starts up and ticks over fine and revs up when twisted slowly. If throttle is twisted rapidly then the engine seems to be either starved of fuel or over rich and bogging down. Plug colour is dark so seems to be running rich. any ideas folks Ive had the carb on/ff so many times and run out of ideas. Ive even checked the connecting rubber to the engine for cracks air leaks( this would cause weak running but Im desperate helllpp. cheers rog p.



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Super Guru

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try it with the fuel cap off, just incase the breather pipe is blocked and creating a vaccum, so no fuel can get to the carb quick enough.



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Outside chance check the pet**** valve is running fuel through freely and at a good flowrate, ie not dripping but running. Good luck



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Pet****  word was blanked out?? Naughty word Pet and Coc* wont display LOL



-- Edited by Rossyboys on Friday 30th of September 2022 12:55:18 AM

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Ok thanks for this Ive already emptied the tank and taken off the tap and checked the filter all ok. Fuel flow is fine. cheers rog p.



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