GS intake boot questions...

[jtolbert]

I have an '83 GS1100GL that I'm looking at different induction options for, particularly an EFI conversion using a Megasquirt. I'm trying to determine the inside diameter of the intake boots on the bike now, but Googling around didn't turn up much. Anyone have any ideas? The spare set of carbs I have measured right around 41mm in outside diameter...Is that the biggest outside diameter I can run? Are there any larger boots available?

[salty_monk]

Think you might get the measurements on the Fiche at BB or flatout.

[jtolbert]

Maybe I'm looking at the wrong section of fiche...The cylinder head section lists the boots, but only a part number and not any measurements.

[Nessism]

You might want to post this in the Performance Mods forum since those guys have lots of experience with this sort of stuff.

Sounds like a good project and good luck.

[Matchless]

Maybe this will give you some sort of guidance. The inlet manifold o-ring size is shown as 39.7mm x 2.4mm for the 1980 GS1000G which uses Mikuni BS34SS carbs. I see the o-ring size for the 1983 GS1100L is given as the same size. I also measure 39mm on the carb side inner of the rubber boot and 38mm on the inner locating ridge of an old GS1000G boot.

[jtolbert]

Interesting. Thanks for the info.

[jtolbert]

Anyone wanna bet whether or not the intake ends of some '01-'03 Suzuki GSXR-600 throttle bodies (butterflies are 38mm in diameter) will fit in to the stock boots? A guy has got a set on an '82 Yamaha XS1100, which apparently used BS34s, without having to hack the boots to much...So I'm guessing they'll fit. Now I just get to hack up linkages, fuel rails, etc. to get the throttle bodies to fit as a unit.

[hkeni]

Try www.cyclewareables.com for carb holders..I found one to fit my GPZ throttle bodies.