Easy enough to change the oil on the Huasheng 142 49cc 4 stroke engine. I fabricated a tray to collect and divert the oil. I used a 150ml syringe to fill ( I used 110ml of 10-30 oil).
Wipe it down, fill it up and go ! DON’T overfill.
How To Change Oil On A 49cc 4 Stroke Motorized Bike 142F Huasheng 