Joast
Active Member
I am trying to adjust my new Bofeng carb on my Schwinn with a 66/80, but I am not quite sure if it needs much tuning. Below is a plug pic after full throttle.
It seems to be four stroking just a bit at mid and high rpm, but not near as bad as with my original carb. Top speed is now just a little over 28 mph on gps with a 44-tooth rear sprocket. The only non-stock part is an expansion chamber exhaust pipe. The air filter foam is out for now.
I had a couple of questions:
1. Does the idle adjustment screw setting affect how rich or lean the mixture is when the throttle is partially or fully open?
My elevation level here is about 500 feet, and the throttle needle is still set in the middle position.
I still have the stock jet in --a 70 I think.
2) Does the needle setting and jet size sound about right looking at the plug?
I also have a 68 and 65 jet if needed.
Thanks for any info. John
It seems to be four stroking just a bit at mid and high rpm, but not near as bad as with my original carb. Top speed is now just a little over 28 mph on gps with a 44-tooth rear sprocket. The only non-stock part is an expansion chamber exhaust pipe. The air filter foam is out for now.
I had a couple of questions:
1. Does the idle adjustment screw setting affect how rich or lean the mixture is when the throttle is partially or fully open?
My elevation level here is about 500 feet, and the throttle needle is still set in the middle position.
I still have the stock jet in --a 70 I think.
2) Does the needle setting and jet size sound about right looking at the plug?
I also have a 68 and 65 jet if needed.
Thanks for any info. John