are the 78 & 79 mikuni bs 34 cv carb the same?

[1fasttrucker]

Hay guys I am in the process of rebuilding my carbs have a set of mikuni bs 34 cv carbs off a 78 xs 1100 dont know modle , on my 79 xs 1100 special I am looking at carb kits on georgesfixs.com and find kits for 78 xs1100 E and 79 xs1100 special , I belive either kit will work but would like a little advise .
thanks
1fasttrucker

[natemoen]

Carbs are the same. 78's were jetted a tad richer though.

[Mr.Bill]

Carbs are the same. 78's were jetted a tad richer though.

Cool to know, So IF one was to remove the Air Box on a 79 special and use pods, the Carb kit for the 78 Standard might assist with that mod, beings a tad richer ?

[natemoen]

78's jets were 210 air jet, 137.5 main jet, and 45 pilot. I think in 79 it went to 180 air, 137.5 main, and 42.5 pilot. I might be wrong though. I think you would just be better off buying the jets you need.

[BA80]

In theory.........If you order kits with jets make certain they are genuine Mikuni parts. The aftermarket jets are not correct.

[81xsproject]

Not sure about the air jets, but I know that the starter jet pressed into the bowl was richer on the 78 than the 79. I have a couple 70's sets I am processing for resale right now. I will have to take a look at the air jets.

[James England]

In theory.........If you order kits with jets make certain they are genuine Mikuni parts. The aftermarket jets are not correct.

On my own experience, that is simpy not true. Carb kits certainly do not need to be genuine Mikuni in order to be 100% fine. Yes, there are some carb kits out there with inaccurately produced jets but that doesn't mean they are all like that.

I used Georgefix kits on my bike over a year ago. I doubt the jets are Mikuni. My bike works perfectly and never, ever misses a beat. I wouldn't hesitate to use the same kits again on another bike and I certainly wouldn't pay out through the nose for genuine Mikuni spares.

[81xsproject]

On my own experience, that is simpy not true. Carb kits certainly do not need to be genuine Mikuni in order to be 100% fine. Yes, there are some carb kits out there with inaccurately produced jets but that doesn't mean they are all like that.

I used Georgefix kits on my bike over a year ago. I doubt the jets are Mikuni. My bike works perfectly and never, ever misses a beat. I wouldn't hesitate to use the same kits again on another bike and I certainly wouldn't pay out through the nose for genuine Mikuni spares.

George carries good stuff. But, that does not mean all kits are good. I have had several customers send me carbs that they just couldn't get to run because of bad kits. One of the sets I have right now has a set of VM22/210 type pilots in it that match the of brand of kit mains. No wonder the poor bastard couldn't get them to run. Usually it is the wrong pilot jets, but I have seen other wrong parts too. Kits are a gamble, Mikuni is right every time. As far as money goes, nothing throws away more than the concept of buying kits in the first place. The only parts that wear are the needle valves, the jets needles, and the needle jets. Two of those don't come in most kits and I sure as heck wouldn't trust ones that did. Bowl gaskets and float valves are all that is needed unless there is a jetting application change. Buying kits IS paying through the nose.

[James England]

George carries good stuff. But, that does not mean all kits are good. I have had several customers send me carbs that they just couldn't get to run because of bad kits. One of the sets I have right now has a set of VM22/210 type pilots in it that match the of brand of kit mains. No wonder the poor bastard couldn't get them to run. Usually it is the wrong pilot jets, but I have seen other wrong parts too. Kits are a gamble, Mikuni is right every time. As far as money goes, nothing throws away more than the concept of buying kits in the first place. The only parts that wear are the needle valves, the jets needles, and the needle jets. Two of those don't come in most kits and I sure as heck wouldn't trust ones that did. Bowl gaskets and float valves are all that is needed unless there is a jetting application change. Buying kits IS paying through the nose.

Well I must have got lucky with my kits then, especially at about $15 total per carb. I'm absolutely delighted with mine and have perfect starting, tickover, acceleration and never ever a misfire. Like I say, I would have no hesitation whatsoever in using them again on my next project bike. I deliberately avoided buying only float needles and valves and gaskets (erroneously described as 'kits' on eBay). My original jets were definitely past their prime, corroded, cruddy and blocked. They often get damaged when removing them from carb bodies for cleaning. A carb rebuild should be exactly that, IMO, not just replacing a float valve and a gasket. I'm sure that's why my bike went from the odd cough and splutter and OK running, to exemplary performance.

[crazy steve]

I have to agree with Jessie on the 'value' of kits. I bought my kits for the SG from Georgefix, and one problem I had was the incorrect jet needles supplied with the kits. They had the wrong taper, and gave me a hopelessly rich mixture until I swapped them for some good used OEM needles. He also didn't supply the right number/sizes of jets (sending jets for a G, not a SG). I'm sure he would have corrected it, but I didn't want to wait.

With that said, if you need new idle screws and the attending hardware, the kits do offer a 'everything in one package' convenience. But the remaining jets will almost always clean up as long as they haven't been damaged by improper removal/installation. In the future, I'll probably buy the 'po' boy' kits as that's really all you need...