Alternative- to increase your gear ratio (make the bike lower geared) you can increase the number of teeth (diameter) of your jack shaft "input" sprocket. That is the sprocket connected to the clutch. Or, you can decrease the jack shaft out put sprocket- the sprocket driving your rear wheel. From the photos, it looks like your output sprocket is pretty small.'
Both of those actions require chain adjustment, and quite possibly adding or subtracting chain links. If you have that tool, it is a very easy job to do. I would rather do all of that, then pull the rear wheel off and deal with changing the rear sprocket, if I were a guy just starting out with these. (simplicity)
One tooth can make a big difference. Glad to see you got it up and running.
Both of those actions require chain adjustment, and quite possibly adding or subtracting chain links. If you have that tool, it is a very easy job to do. I would rather do all of that, then pull the rear wheel off and deal with changing the rear sprocket, if I were a guy just starting out with these. (simplicity)
One tooth can make a big difference. Glad to see you got it up and running.