Adjust the screw with the spring on the side of the carburetor. Clockwise to reduce gas flow and counterclockwise to allow more gas flow. Bogging down is usually caused by too much gas going thru the carburetor.
Give time for it to warm up. You may need a new spark plug. For your 150 cc Scooter we recommend a NGK C7HSA Spark Plug
If that does not solve the problem, you may need to have your carburetor cleaned or you may need a new carburetor.
Taking the carburator apart is not difficult, but you must remember to put everything abck in the same location without loosing any seals or washers. If you take the carburator apart took through all jets and ports. If you don’t see any light through the jets or ports then this is your issue. Simply clean the blockage and put the carburator back together. This is the issue with 100% of the scooter problems we see every spring. The scooters get almost 100 miles per gallon beacuse the jet that allows gas into the carberator is so tiny. This tiny jet is the reason this issue happens. When the scooter is not winterized propperly or ethanol gas is used this jet can get plugged up easily. By winterizing properly and avoiding ethanol gas you can avoid this issue.
