Jet sizes needed for 1981 GS750E

[Anonymous]

Does anyone know the stock jet sizes for a 1981 GS750E having the original BS32SS CV carbs?

--Brian

[Anonymous]

Main jet is 112.5 mikuni

pilot jet is 42.5

main air jet 1.7

[Anonymous]

Jet sizes needed for 1981 GS750E

Thanks Jon!

I stopped by Suzuki today and they pulled up the part numbers also:

Pilot jet: Mikuni 42.5 (Suzuki 09492-42007; Sudco 004-059)
Main jet: Mikuni 112.5 (Suzuki 09491-22015)
Needle jet: Y4 Needle: 5C28 (no longer available)
Air jet: 170 (Suzuki 09493-34001; Sudco 002-168)

One question though Jon -- K & L kit came with 170 air jet, and Suzuki sez the 170 is used for this carb. But you said to use 1.7, Sudco shows 1.7 (for BS30/97 Spigot applications where bleed type needle jet is used). Sudco also shows the 170 as being used for B42/55 applications.

Now I'm confused... 8O

[Anonymous]

Sorry, thats what my Canadian specs say in the manual.

[Anonymous]

Jet sizes needed for 1981 GS750E

Jon,

What I found out was the 170 air jet size is based on flow whereas the 1.7 air jet is based on size. I would assume at this time that 170 would equal a flow rate of 170cc fuel/minute, and that 1.7 = 1.7mm, which would flow about 158.75cc fuel/minute (using DJ to Mikuni conversion charts such as found at http://vmaxoutlaw.com/tech/dyno-mikuni.htm). In other words, the Canadian bikes are biased a wee bit richer which would certainly help with power and drivability!

Brian