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Downsides to too large carbs on street?

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    #16
    Hello Everybody!
    Sorry for the cross post, I am asking this same question in a thread in appearance mods I started on my build, but since I asked the original question here and this is more a performance question I will repeat myself here;

    Well, I scored a set of Mikuni RS38's off the E*ay last night with a buy it now of $225. I really wanted some 36s but I could not ponder much as I thought this opportunity wouldn't last. I have had deals bought out from under me while I stared at the screen. I just confirmed they weren't old slabby flatslides and hit the button.

    So I guess I will find out first hand what too-big carbs will do. I already have a set of fcr 39's with spacing that didn't fit the GS (or I would have tried them last summer) and I have grand plans for a big bore some day, but that is a year or two away and as far as I can tell I have a stock 1100 with a header.

    Any advice on jet sizes I should start with? I plan to go through these before I try to use them, any advice? I also have an odd thought of machining some 1mm thick, tapered, hard plastic reducer bushings to bring the venturis down to 36mm. I would press them in for the time being and take them out later once I can utilize more flow. I have heard of many instances of boring a carb body larger, or using filler in a manifold to alter the flow characteristics, why wouldn't it work in reverse? Or am I worrying for nothing?

    Cheers, Erick

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      #17
      actually cv's run friggin sweet without the airbox. They are vacuum based carbs. whatcha needa do is is pull the tops off and bore out the vacuum holds just a bit. slap some pods on her. I'm a firm believer that airboxes were invented by the government to make life boring for us citizens.

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        #18
        Erick, give me a call at 714-356-7845 & I'll help you out. I wanted to talk to you anyway. Ray.

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          #19
          IU've been in the same boat Zweihammer, been trying to snag some 36mm slingshots for months now, ALMOST bought the 38's a couple times, but didn't.

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            #20
            Gonzo, I have a set & will put whatever main jets in them you want. I want $400.00 + shipping. Let me know if you are interested, Ray.

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              #21
              Originally posted by rapidray View Post
              Gonzo, I have a set & will put whatever main jets in them you want. I want $400.00 + shipping. Let me know if you are interested, Ray.
              Got a line on an inexpensive set from Canada, but if it falls through, I'll give you a shout. Thanks Ray, I almost emailed you a few days ago to ask if you had a set, I KNEW you would.

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                #22
                Originally posted by chef1366 View Post
                Get a set of 88-91 36mm Gixxer carbs.
                thats what i have on my 81 1100e. funny thing is when the bike was given to me( for free ) it was like that. i added k&n race filters to it. i never rode it stock so idk what it was like then. but man it has loads of power and pull almost from the bottom. i think everything else on the engine is stock except for the coils.

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