Basically: remove fuel tank, remove both fuel screws* and open carb drain screws. Spray carb cleaner (red straw attached) down through fuel screw opening. Hopefully it will begin dripping out drain at some point, let it sit overnight, repeat until it seems it is spraying all the way through pilot jet (inside bowl). Tighten drains, reinstall fuel screws to seat gently, then back fuel screws 3 turns. Install tank, fresh fuel, cross fingers, vroom-vroom.
Pay careful attention to spring, o-ring & washer under screw (the latter can stay in carb just make sure it's centered in bore prior to reinstall)
Realize this is a 50yr experienced hill-jack giving advice: caution.
You made me look again, yes the screws
are open! that does give Chris a simple "try this". Note: who ever drilled out the plugs also drilled the top of the mixture screw head a bit, so be cautious with your screw driver.
First squirt them with a bit of rust buster, light spray lube.
We are talking brass in aluminum, slots, threads EASILY damaged.
Slowly turn them in til they stop turning, do NOT force! then back them out about 3 1/2 turns, try idling again.
If it doesn't help try it
again.
It does not hurt to add some carb cleaner to the gas Techron is a known good brand, but about any brand won't hurt, might help a bit.
If you can, RIDE it, out in the country, put on 100 KM or more, add gas repeat, sometimes if the system isn't badly gummed up, this might be enough to get it running OK again.
