Adjusting Mikuni Carburetor Choke

[geezer101]

Thankyou for the pic on a number of levels. #1 I have never seen an electric choke on a Mikuni, and #2 verifying that the adjustment technique is the same as an electric choked Weber carb. Have you worked out how to hook up the vacuum solenoid next to the choke cam gear? I think it would have a thermal switch somewhere telling it when to release it at operating temperature (my guess anyway) I also think you have a relatively rare carb in your hands and I would then wonder about the manifold you removed it from. Was it from another 4G54 engine and do you remember what vehicle? This could be very handy resource material for future reference

[BJH324JH]

Thankyou for the pic on a number of levels. #1 I have never seen an electric choke on a Mikuni, and #2 verifying that the adjustment technique is the same as an electric choked Weber carb. Have you worked out how to hook up the vacuum solenoid next to the choke cam gear? I think it would have a thermal switch somewhere telling it when to release it at operating temperature (my guess anyway) I also think you have a relatively rare carb in your hands and I would then wonder about the manifold you removed it from. Was it from another 4G54 engine and do you remember what vehicle? This could be very handy resource material for future reference

I have been fiddling around with the vacuum pump and hooked up a hose to what I think you are describing. When I create a vacuum with the vacuum pump, I notice that this little arm hook thing moves in and pulls in the cam gear with the teeth on it. I turned on the truck to see if this little arm hook thing would move and it didn't. I inspected the hoses and found that they were cracked and torn. So I removed all the hoses to check them for leaks with my vacuum gun and some water. My vacuum gun can also pressurize. I plugged one end of the hose and attached the other end to my gun and pressurized the hose, then I put the hose underwater in a little bowl of water to check for leaks. If you aren't familiar with this technique, its basically the same way you check inner tubes for holes. Works pretty well. I might make a tutorial on this. After checking all the hoses for leaks, I noticed it still would not hold vacuum and thus not be able to move the arm, so what is happening? Will it begin to hold vacuum once the truck reaches temperature?

Some pictures of what I attached the vacuum pump to, to make the little arm hook thing move. (Vacuum = Arm moves in, No Vacuum = no movement of arm.)

NO VACUUM:
20170131_222648.jpg

VACUUM:
20170131_222813.jpg