Question about 1985 Suzuki GSX 550 ES

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Not running on all 4

Im in the middle of restoring my 1985 gxs550es got the engine and electrics all plumbed back in but it only runs on cylinders 3 and 4 there is a spark on 1 and 2 so it can only be a fueling problem but i cant seem to locate it and or fix it and im stuck in a rut without anything i can think of doing to fix the prob.
Any help would be greatly appreciated,
many thanks richard.

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  • clarky_24 Jan 01, 2009

    hi should have said in the first post iv had the carbs off and they have been sent off to be cleaned came back not long ago and they were fine apparently im just wondering about the lines and the which part they all go to and if iv got it plubed in correctly there i have 4 pipes on mine 1 is fuel in, i have a small pipe which is the vacuum and 2 others which say they are breather pipes in my haynes but as far as i can remember one of them should be connected to the little outlet by the sender on the tank.

  • clarky_24 Feb 19, 2009

    hi mate, had carbs off again as i had no luck running on all 4, there is no **** in the jets to the left side only a slight bit in one of the idle jets for the running side so no prob i can identify there.

    im not starting to think it could be electrical i.e weak spark or something, i changed the regulator rectifier just before i started the rebuild so i think i can rule that one out.

    could it be anything to do with the igniter, cdi or coils i really need help with this any help would be great. Richard


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Hi m8,,just to give u some things to check b4 i give yuh some more tips,, 1st, thing had your bike been stood 4 a while if so it would have been on its side stand at some point so 1 and 2 carb would have contaminated fuel in, work on those two carbs and make sure they have clean jets and float bowl,,while your in the carbs have a look at the diaphrams on top of the carb,, gently take one out and hold the diaphram up to the light to see if it has any pin holes,,, if there isnt then happy dayz,, it sounds more like fuel thats gone off in side the float bowl and blocked up your jet,, take the jet out,, and poke a pin in the holes ,try that mate,,

Posted on Jan 01, 2009

  • terry weightman
    terry weightman Jan 01, 2009

    yeah thas right m8,, your spot on with that,, this may sound funny but some people when puttin bikes back together and the carbs are off 4 a while,put rag or even tissue in the ports,, and 4 get they did that,,or take some one elses project and 4 get to mention ,turn the motor over and **** the tissue in 2 the head,, not sayin thats wot has been done ,,but happens,, have u tried the pour a bit of fuel into the spark plug holes , to see if it does fire on 4,,or swap over the coil wires to eliminate electrical


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