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New Carb Purchase Info.

  • Thread starter Thread starter Boozy Creek Beast
  • Start date Start date
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Boozy Creek Beast

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I have a 1980 GS 1100 with an 1166 kit stage 3 jets, air pods with a V&H megaphone header. I am planning on picking up a new set of Mikuni Flat slide carbs. soon. A.P.E sells a set of 36mm and Bike Bandit sells 36mm and 34mm. My question is what is the MM size of my original carbs and since I do not plan to race which would be the best set 34mm or 36mm. I would also like to know if these are the best carbs for my bike since all of my riding is casual but every once in a while I will get on it hard for that seat of the pants riding experience that reminds me that my heart is still beating.

The Beast
 
I think that CV carbs are the best for casual street riding. They are very smooth on the transfer from idle to steady cruise (0~1/4 throttle opening)
the real down fall of the CVs' is the time it takes to really spool up on hard acceleration.

36 flats will give you the best top end performance but a bit jerky down low in the rev range.
34 are better in the middle but still leave a bit to be desired when first opening the throttle from standing still.
the flatslides have a accelerator pump that do a ok job for the smaller throttle opening 0~1/8 opening but their emphasis is on the 1/2~wide open throttle performance not really smoothness

I love performance but nothing is better than silky smooth transition from one fuel circut to another in traffic... and on the street you are most always on the idle/ pilot circut transisting into the transfer circut fed through the pilot jet. getting onto the needle circut when entering a highway once in a while. rarely are you ever going to be strictly on the main fuel circut even when you are it is only for a second or two-maybe three.
 
Boozy Creek Beast said:
I have a 1980 GS 1100 with an 1166 kit stage 3 jets, air pods with a V&H megaphone header. I am planning on picking up a new set of Mikuni Flat slide carbs. soon. A.P.E sells a set of 36mm and Bike Bandit sells 36mm and 34mm. My question is what is the MM size of my original carbs and since I do not plan to race which would be the best set 34mm or 36mm. I would also like to know if these are the best carbs for my bike since all of my riding is casual but every once in a while I will get on it hard for that seat of the pants riding experience that reminds me that my heart is still beating.

The Beast
Click to expand...

I recommend the RS36s. There are Keihins available, but they don't have a choke so far as I understand. I like dealing with www.sudco.com, they have a kit specifically for your bike.

The throttle will be a little heavier, but they will be nearly perfect right out of the box, jetting wise. They are better in every way over the stock CVs.
 
I bought my RS-34's at Pingel. Best price I could find. They have RS36-D3-K's for $629.00. They were a pleasure to deal with and fast. I like the ease of tuning on the mikuni's. You can change all 4 needle clips in about 20 minutes without ruining the sync. or removing the carbs.
 
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I'm running 38's which may be a bit big but I do have a bigger cam setup and a ported head. That being said I'd say the RS's are really a great carb. I had some self inflicted problems but after that I found out how good these things really are. Get a set off sleezebay and find out for yourself. On the street they are just as good as if not better than stock in heavy stop and go traffic and from idle on up they are really better than stock as far as acceleration. A win, win situation.
 
I have 38's on my big blocked street bike. You shouldnt need more than a 36 for street riding.

Sudco is probably the best place to buy NEW Mikuni's or jets/needles/etc.

If you check dragbike.com, ebay, or any of the other racing forums its highly probable you could find a nice used set for about $400 or less. Often you can pickup the carbs with filters, boots, cables, whatever you may need for a lot less used. They are already off the bike, so checking them over when you add your jetting shouldn't be a big deal, replace the bowl gaskets and ride.

If you want them to be smooth as silk, do a valve adjustment / tuneup, get them close, toss in some new plugs and pay the money for a bit of dyno tuning time.

I've had a couple of streetbikes with slide type carbs and they all ran great, but they were PROPERLY setup and dialed in.
 
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