I have had a few members pm me for help adjusting their HS carbs
this info was posted by Quenton (pres of EZM)
I am reposting because I couldn't remember where it was located
"Adjusting the HuaSheng 142F (49cc) carburetor
In order to adjust the carburetor it is necessary to warm the motor up first. The motor should have at least 5 minutes running time before any adjustments are made.
On the left side of the carburetor near the front is the idle mixture screw.
On the HuaSheng motor the idle mixture screw is a fuel adjustment, not an air adjustment.
Simply adjust the screw for maximum idle, and then turn the screw approx 1/16" counter-clockwise [slightly rich].
Check the throttle response, and adjust the mixture if there is a hesitation. Turn screw clockwise if it "bulks" and then catches on [rich], or adjust screw counter-clockwise if it accelerates and then drops off quickly [lean].
Have fun,
__________________
Quenton "Lee" Guenther
EZ Motorbike Company
www.ezmotorbike.com"
Replying all the way into 2018. Oh well this is a very informative thread, hopefully there are still people following and active on this. On my current motorized project bike I'm having a huge pain in the ass starting the motor up if even at all. I have to use starting fluid :/. From what your post was saying I could drill out a brass plug that is in place of the A/F mixture screw. If I adjust the screw would that put life in the motor?
I was also told that this motor might be running too lean thus it not starting up.
Here's a picture of my bike:
I have the HuaSheng 142F (49cc) motor. From recommendations from another forum I was told that there is a A/F adjustment screw hidden behind the brass plug on the other side of the carburetor. Pictured here:
(A/F adjustment screw behind the brass plug closest the the engine)
He stated "Lean engines burn cleaner, but too lean = no fire. I prefer slightly on the rich side, engine runs cooler."
He said if I took out the plug, I would be able to tune the motor.
Would this be the miracule cure to make the motor start?
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