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GS550, GS750 and carb swap question

  • Thread starter Thread starter alan
  • Start date Start date
A

alan

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I was wondering if anyone might know the answer to this one... I have my GS550 carbs on... Mikuni BS's... They had some issues like a diaphragm with holes in it etc. I bought what appears to be a very decent set of identical carbs off E-bay (they aren't here yet). They were taken off a GS750 and are possibly in better overall condition than mine. The owner said they ran great never lost tune etc, so I may want to just swap my old ones out and not play mix and match between the two sets. My question is are things like the jets going to be the same size and if this set is truely better can I just swap and retune or is there any internal workings I need to pay attention to because these are off a bigger bike. I don't want to dismantle stuff I don't need to except to maybe clean.
 
First your BS carbs are probably 30mm the 750 carbs are most likley 34mm so you will have to do some tuning maybe?? Not sure what jets you have I think the 750 has a 115 jet. Buying off ebay they will at the least need to be cleaned. Also I don't know if the carb spacing is the same
 
My 1100E came with 34's so I don't know that the 750 carbs would be that big. Assuming they're like 32mm, if you're currently running pods and a header and the 750 carbs came off a bike with stock jetting, you actually may have a good setup going in. If not you may be way over carbureted and will have to make some changes to your intake and exhaust. As far as spacing goes, if it's not right you may be able to swap the linkage and connectors around to get it right. Definitely take them apart and clean (possibly rebuild) them before you do anything though.
 
It looks like the 750 carbs are stock, but they are, in fact, just a bit bigger than the ones on my bike. (My carbs and exhaust are stock). I don't know if I can mount them and run pods instead of the stock air box. I had wondered that myself. I've been watching the "To pod or not to pod" battle on here and there seems to be no clear winner in that debate. Either they swear by them or swear at them. Tis geting to be a bit of a hassle for one itty bitty slide diaphragm. But I do see a set of actual 550 carbs on E-bay that may yield what I want. I haven't found a parts place that will sell justa digaphragm that will fit my bike. Everyone elses bike, but not mine. Ain't that the way it works though? :(
 
As far as the pod vs no-pod debate goes, I think you really have to have a header to make the pods work. Otherwise you have too much intake flow without an increase in exhaust to balance it all out. I am running both on my 1100 with a Dynojet Stage III kit and the bike runs great. I think when your carbs come in you should pull off the bowls, fill them up with spray carb cleaner, mount them back up (keeping the carbs vertical of course), bolt them onto your bike and let 'er rip. This is not a proper way to clean the carbs but it should get you in the ballpark. It will probably take a while to start so make sure your battery is charged up. Once it's running take it for a ride and see what happens. Assuming the carbs don't have any major cleanup issues going on, they're probably synched close enough to tell whether they're too big for your bike or not. If they are too big you will have a really soggy feeling in the lower rpm ranges. If they do that to, you might try to take the air cleaner assembly off to see if it helps. If it does then pods and header are the way to go. It's more money but you will get more power out of the bike (and it sounds great too!).
 
Well, I just snagged a set of 81 550 carbs so I should be able to be up and running moments after they get here! I guess I'll clean the 750's up for the practice of cleaning :lol: and work on finding them a new home :D
 
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