Here is my maintenance schedule:
Carb: Air Filter-In Arizona it's pretty dusty; anywhere from 5-20 hours.
At about around 50 hours I will pull my carb off and break it down and give it a good cleaning with carb clean.
Spark Plug: Around 20-30 hours I will pull my plug clean it and re-gap
Exhaust: 50 hours I will pull my exhaust and the Baffle and use engine degreaser.
Right side gears: 25-30 hours Check clutch adjustment and lube gears
Left side drive: 20-30 hours check and lube. Will also lube clutch arm
Chain & tensioner & Rear Sprocket: Before every ride/ lube chain if needed.
Head bolts and all engine bolts...ect: Every 25-30 hours
Cables: clutch and throttle lube about every 20-30 hours. I will also lube the throttle housing and adjust cables if needed.
On my bicycle I always check wheels bearing, head tube bearings, spokes, Handlebars, seat...ect. before every ride.
I check wheel bearing grease about every 30-40 hours and check all bolts and nuts on bicycle. And do a very good inspection for any cracks on the frame.
Engine mounts: 25-30 hours
Fuel screen in tank & fuel fliter about 40-50 hours