Will these carbs work?

[Morrison]

The bike is a 78 GS 1000. The stock carbs are FROZEN planned on rebuilding them obviously, but a friend gave me the already rebuilt carbs on the left supposedly off an 1100.. They are obviously bigger bore.. can it be done without swapping heads?

[SqDancerLynn1]

Yes & No Try soaking your carb slides with PB Blaster Maybe some heat !

[ozman]

The bike is a 78 GS 1000. The stock carbs are FROZEN planned on rebuilding them obviously, but a friend gave me the already rebuilt carbs on the left supposedly off an 1100.. They are obviously bigger bore.. can it be done without swapping heads?

to start with they will not fit on your manifolds the least you would need is larger manifolds you can use 1980 manifolds and slot the holes to fit the narrower bolt spacing of the 78 manifolds

oz

[tkent02]

Heat should unstick the throttle slides.

Not easy to switch carburetors, to do it right requires switching cylinder heads to the 1980 style...

[Nessism]

Yes on the heat to loosen the slides. Fuel varnish glues them in place. The easiest path forward to a properly running bike is fixing the old carbs.

[chuck hahn]

Yup..remove the throttle linkage rod and squirt them with some PB Blaster or whatever and then use a propane torch to heat the slide towers. The heat will soften the varnish and suck the oil down in. Pull the slides out while they are still hot with some pliers. Then your all ready for the rest of the tear down and rebuild.

[Morrison]

Ah thats neat, I for see broken screws lol

[chuck hahn]

Well then...you can take a plastic handle from a tooth brush or paint brush and grind it down so it fits between the throat and the bottom of the slides and pry them mup to break them loose instead of the pliers The plastic wont harm the slides edges like the idiots that try a screw driver always do to them. Make it sort of flt like a screw driver tip and stick it in ad twist.

I have done it both ways. I suggested pliers because it involves less McGyvering chit to get the job done.

[Nessism]

I've done three sets of carbs now where the slides were stuck tight. First set was dunked in carb dip but it didn't help. Put a heat gun to the body and the slide fell out under its own weight in about 30 seconds. I'd try that first and go to the spray oil stuff (or pliers) only if necessary.

[chuck hahn]

But did they also have the chalky white scale built up around them or just the yellow / brownish varnish? Makes a he!! of a difference in what one is up against.