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I have a 1981 gs850l that has problems starting. It has a rebuilt petcock, carburetors, new intake boots, new spark plugs and battery. It used to fire up and die but it would eventually start up and run but there would be very intense backfires during idle. After changing the intake boots and sparks plugs it would not start up at all. I noticed some fuel in the airbox and I was wondering if anyone could help me diagnose these problems.
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Float is sticking for one thing. That's why there is fuel in the airbox.Ed
To measure is to know.
Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182
Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846
Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf
KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection -
When you say you rebuilt the carbs, did you follow the tutorial?
Because fuel overflow is typically caused by bad O rings and backfiring at idle is dirty pilot jets1978 GS 1000 (since new)
1979 GS 1000 (The Fridge, superbike replica project)
1978 GS 1000 (parts)
1981 GS 850 (anyone want a project?)
1981 GPZ 550 (backroad screamer)
1970 450 Mk IIID (THUMP!)
2007 DRz 400S
1999 ATK 490ES
1994 DR 350SESComment
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Ditch the rebuilt petcock ....just get a new one to rule out its potential leak issues. Make sure you understand its 3 positions.1981 gs650L
"We are all born ignorant, but you have to work hard to stay stupid" Ben FranklinComment
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Rebuilt petcock that could be a problem there are many post on here about that it seems there are far more reports of failure than reports than success. As all ready stated you have a stuck float possible dirt in pilots, air leaks in system causing weak mixture.
when you say rebuilt the carbs did you use the Oem jets or buy a kit?
did you replace the orings between the cylinder head and the carb rubbers?
Basically you need to follow the carb tutorial to ensure every thing is clean.The big guy up there rides a Suzuki (this I know)
1981 gs850gx
1999 RF900
past bikes. RF900
TL1000s
Hayabusa
gsx 750f x2
197cc Francis Barnett
various British nailsComment
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Fuel in the air box and it's back firing!? Cease all actions until you get that leak fixed. One good back fire into the air box and bye bye bike.sigpicMrBill Been a GSR member on and off since April 2002
1980 GS 750E Bought new in Feb of 1980
2015 CAN AM RTS
Stuff I've done to my bike:dancing: 1100E front end with new Sonic springs, 1100E swing arm conversion with new Progressive shocks installed, 530 sprockets/chain conversion, new SS brake lines, new brake pads. New SS fasteners through out. Rebuilt carbs, new EBC clutch springs and horn installed. New paint. Motor runs strong.Comment
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