If the engine is running a little too rich on idle it has a tendency to bog or die when leaning forward if the metering chamber is facing the propeller. Easy fix, turn the carb 180° and the problem is gone.
3D printer .stl file 10mm WB37 carb spacer. https://drive.google.com/file/d/1pM0020mR_EQSqtMS5Ia5Mk1wqc5p0h-j/view?usp=drivesdk
If you want to buy a throttle shaft instead of modifying your own. Buy a shaft for one of these models, WB3A, WB32
These shafts are available for purchase from karting parts suppliers, either individually or as part of a carb assembly or rebuild kit.
A complete carb is only ~$30.00 from Aliexpress. Then you get the shaft and other spare parts for your WB37 carb.
