Carburettors

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  • James England
    XS-XJ Super Guru
    • Oct 2010
    • 3039
    • North of England
    #16
    I measured the OD of the inlet and airbox mouths of the carbs. Well, I say measured... I got the OD of the rubber manifolds where they slide over the carbs, using a Vernier gauge and then deducted the thickness of the rubber x 2. I measured this thickness by pushing a steel ruler across the joint of the carb and manifold. The thickness of the rubber on the inlet side looks to be 7mm and, on the airbox side, 5 or 6mm

    I get the OD of the inlet to be 43mm and the airbox side is 55mm.

    My gut reaction, having stripped loads of XS carbs is that the XJRs will physically fit. I dunno about the jets etc being right though, although they may be.

    I wonder if the rubber inlet manifolds from an FJR1200 would bolt straight onto the XS? I have the FJR ones n my bike as the OEM ones are restricted by reducing the ID.


    XS1100F 1980 European model. Standard. Dyna coils. Iridium plugs. XS750 final drive (sometimes). Micron fork brace. Progressive front springs. Geezer regulator/rectifier. Stainless 4 into 2 exhaust. Auto CCT (Venturer 1300) SOLD. New project now on the go. 1980 European model.

      Comment

      • natemoen
        Master of XSology
        • May 2010
        • 8640
        • Fargo
        #17
        One more question. What is the total depth of the carbs edge of inlet throat to edge of outlet throat? Roughly
        Nathan
        KD9ARL

        μολὼν λαβέ

        1978 XS1100E
        K&N Filter
        #45 pilot Jet, #137.5 Main Jet
        OEM Exhaust
        ATK Fork Brace
        LED Dash lights
        Ammeter, Oil Pressure, Oil Temp, and Volt Meters
        Green Monster Coils
        SS Brake Lines
        Vision 550 Auto Tensioner

        In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

        Theodore Roosevelt

          Comment

          • James England
            XS-XJ Super Guru
            • Oct 2010
            • 3039
            • North of England
            #18
            Originally posted by natemoen
            One more question. What is the total depth of the carbs edge of inlet throat to edge of outlet throat? Roughly
            Ask as many as you like, Nate.

            You want the width of the carb, when viewed from the side of the bike, correct? It is 100mm.





            Here's another measurement which might help...45mm as per pic below
            Last edited by James England; 07-29-2013, 10:17 AM.
            XS1100F 1980 European model. Standard. Dyna coils. Iridium plugs. XS750 final drive (sometimes). Micron fork brace. Progressive front springs. Geezer regulator/rectifier. Stainless 4 into 2 exhaust. Auto CCT (Venturer 1300) SOLD. New project now on the go. 1980 European model.

              Comment

              • James England
                XS-XJ Super Guru
                • Oct 2010
                • 3039
                • North of England
                #19
                Originally posted by jetmechmarty
                There is likely little to no support
                what makes you say that? Tut tut....guessing aren't we?

                The XJR1300 engine and carbs are used in the US in racing cars. I bought a spin-on oil filter adapter and carbon fibre gearchange rod from the USA. They aren't available here in the UK at all. Have a look at the carb stuff too...... The world is a small place these days, so there is always support. I buy loads from the USA and send things to loads of other countries including, from USA three lots of Dyna coils, a complete GL1000 exhaust system, oil filter adapter and gear linkage, forged alloy wheels from Japan, any amount of things from Europe. I've sent the precious rear wheel bearings the world over.


                RPM Spin On Oil Filter Adapter, Engine Parts, spinonfilteradapter - RPM - Raduechel Performance Motorsports
                http://www.rpmracingca.com/proddetail.asp?prod=spinonfilteradapter
                The RPM spin-on oil filter adapter is specifically made for the FJ-XJ-XJR.                Will fit; Yamaha FJ1100-1200, XJ1200 and XJR1300. The stock filter canister is prone to stripped drain screws, pinched wires and missing parts everytime you change your oil. The installation of this part eliminates all of those issues at once. You can now use a automotive type spin-on filter which are available at any autoparts store near you. No more buying FJ specific filters online or from the dealer. - Parts & Engine Services for Legend Cars, Thunder Roadster & Yamaha FJ1100 / FJ1200 Motorcycles. Helping Racers become Champions for over 15 years.
                Last edited by James England; 07-29-2013, 10:32 AM.
                XS1100F 1980 European model. Standard. Dyna coils. Iridium plugs. XS750 final drive (sometimes). Micron fork brace. Progressive front springs. Geezer regulator/rectifier. Stainless 4 into 2 exhaust. Auto CCT (Venturer 1300) SOLD. New project now on the go. 1980 European model.

                  Comment

                  • FJ111200
                    XStremely XSive
                    • Oct 2007
                    • 317
                    • Crewe, Cheshire, UK
                    #20
                    James,

                    here's really good bit of info for you. Could save you a load of ballache.

                    http://www.benefiscal.co.uk/forum/index.php?topic=11257.0

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