Question about 1984 Suzuki Gs 550 L

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Carb issues hi,i bought a 1982 gs550l at the begining of the year,it was standing for about 2yr's in the previous owners garage.i had the carbs cleaned before trying to get it started.when i got the carbs back it started first time round but then i noticed the carbs started leaking,through the overflow pipes as well as the the back of the carbs.so i sent it away again,this time the needles got changed and i was told everything was ok,but when i put it back on the bike and it tasted a bit of petrol it would start leaking,so i sent it away again and then again but it still leaks.please someone,anyone give me some advice,because this has been going on for about 10 months now and i really want get it on the road.

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  • Anonymous Mar 30, 2014

    idles rough,backfires,plugs are immediately fouled black carbon

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Sorry to hear about your carb issues. Two possible issues that come to mind are (1) fuel level in the bowl most float assemblies are made of brass and have a small tab which applies pressure on the float needle. If this tab is not adjusted correctly the fuel will not shut off when the float reaches its maximum height. The tab can be bent to apply pressure at just the right moment. You can verify this by doing a bench test, with the bowl off. So much nicer to know before going through all the work of putting it back on the bike. (2) Check the buoyancy of the float itself many of the old-school foam ones dont have enough umph to close the needle all the way. If you have the brass style floats make sure you dont have a leak. ( submerge the float then check for air bubbles also shake the float and listen for gasoline within) Check with GDL Cycles they can help you with those hard to find parts for many old school Japanese bikes.

Posted on Nov 10, 2008

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HI zizi_tripo,

Sounds like a familiar problem to me. I've bought a GS550L from '85 for my daughter a couple of years ago and had the same problem. This is caused by O-rings not sealing off. I can't exactly remember which ones, but it has to do with the floater mechanism. As soon as the fuel chambers of the carburetors are filling, the floaters go up and close the fuel supply. If the they don't, gravity will keep on drawing full out of the tank and the carburator will start leaking, mainly through the air inlet/filter housing.
I solved the problem (after a lot of searching for it's origin) by buying two simple O-rings (€ 1,00 each) and replace the old ones.

Noci, Royal Venture cruiser, the Netherlands

Posted on Mar 21, 2009

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Posted on Jan 02, 2017

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