Mikuni 33mm Smoothbores

[Julian_Boolean]

Just won a set of these on EBay, anyone got a rough idea of jetting for an 1170 engine with open exhaust?

I might sell my RS34s if the VM33s work better, they're certainly more in fitting with the bike than the RS34s.

[Pigford]

Appreciate first dibs on the RS34's if you do decide to sell pleeze

[KWACKERZ1]

Bob's 1170 running 33mm carbs, is 142.5 mains but running 8 plug head.

So 137.5's 140's should be right for yours. Also they run 0.6 air correctors.

as per APE tuning tips,

"For those of you who still own these carburetors a little jetting trick. In order to get better throttle response install 0.6 air correction jets. This allows you to run a smaller main jet while still giving you approximately the same air fuel ratio as before. Good starting point is 4 main jet sizes smaller than you previously had. Also installing a O-6 needle jet will help lean out the mid range"

[KWACKERZ1]

Bob's 1170 running 33mm carbs, is 142.5 mains but running 8 plug head.

So 137.5's 140's should be right for yours. Also they run 0.6 air correctors.

as per APE tuning tips,

"For those of you who still own these carburetors a little jetting trick. In order to get better throttle response install 0.6 air correction jets. This allows you to run a smaller main jet while still giving you approximately the same air fuel ratio as before. Good starting point is 4 main jet sizes smaller than you previously had. Also installing a O-6 needle jet will help lean out the mid range"

[Pigford]

I have a new set of 0.6 air correctors up for or grabs if needed.

[Julian_Boolean]

I'll have a look what's in them when they get here, but might well be interested in the 0.6 air correctors