'82 Kat....CV Carbs

[zackybilly1]

During the course of cleaning a set of carbs, I removed the factory plugs over the Air screws. As a base, I checked the screw positions as I exposed them. They were as follows:

#1 4.50 rounds out
#2 3.25 rounds out
#3 3.25 rounds out
#4 3.75 rounds out

I'm assuming 3.50 rounds out would be a good starting point but as it was it seems #1 was out of line. #2 & 3 seem to follow suit on the butterfly sync procedure.

I guess they put the bank of carbs in a test fixture at the factory for the EPA tune job. Assuming the butterflies have been sync'd, how do you set the slow circuit? Plug chops? Gauges? I'm sure these weren't covered in the service manual due to the "permanent" plug, but I'm only used to working on old twins and don't know where to start (other than 3-1/2 rounds out) on getting it close to being right.

Thanks, again.

Z

[Kreylyn]

During the course of cleaning a set of carbs, I removed the factory plugs over the Air screws. As a base, I checked the screw positions as I exposed them. They were as follows:

#1 4.50 rounds out
#2 3.25 rounds out
#3 3.25 rounds out
#4 3.75 rounds out

I'm assuming 3.50 rounds out would be a good starting point but as it was it seems #1 was out of line. #2 & 3 seem to follow suit on the butterfly sync procedure.

I guess they put the bank of carbs in a test fixture at the factory for the EPA tune job. Assuming the butterflies have been sync'd, how do you set the slow circuit? Plug chops? Gauges? I'm sure these weren't covered in the service manual due to the "permanent" plug, but I'm only used to working on old twins and don't know where to start (other than 3-1/2 rounds out) on getting it close to being right.

Thanks, again.

Z

If you get a right angle screwdriver (motion pro sells some under carb tools) you can adjust the A/F screws correctly instead of having to guess.

At Idle, turn in a screw slowly until that cylinder starts to miss/run rough... back it out 1/4 turn. Do the next, etc... This would be the optimal way to set the A/F screws...

If it idles at all at 3.5 turns... then that will work good enough I guess.

Krey

[suzukiray]

Krey, if you are going to post in the Vintage section, do some reading & study up on the old Kats first. The early Kat Mikuni cv carbs have the mixture screws on TOP. You should start by adjusting them 2.5 turns out & then tune it from there. Ray.