It depends on how often you ride. I have a motorized bicycle and if I ride it to three times a week I will change it every week. I buy a quart of the four stroke motor oil and I got a old dawn bottle. Only uses like not even half a cup. When I emptied it I used McDonald's soda cup glass whatever you want to call it and it may be 2in on the bottom was oil.just wondering how often i should be changing the oil in my motor?
I once wrote a post about this. Got the pump from Harbor Freight for $12.I spose a setup like that would benefit from using a suction pump to extract the oil:
View attachment 91591