How much oil to mix with gas for the 2100C John Deere weed wacker?

Lookup for your specific model - but most of these require a 50:1 gas/oil mix.

There may be a filter on the fuel pickup line inside the fuel tank that has clogged due to old fuel being left in the tank. Look inside the tank - it probably looks like rust - you need to change that. Any lawn mower repair shop should have a filter that works and could change it for you. Note - run the blower until it runs out of fuel before storage to avoid problems like this - same rule for lawnmowers, weed wackers, etc.

50:1 50 parts petrol to 1 part oil

50:1 mix 50 petrol 1 part oil

if using sthil oil the mix is 50:1 if not then its either 32:1 or 40:1 not to much dif

50:1

Mix one (1) ounce of two cycle oil per quart of gasoline or four (4) ounces of oil per gallon of unleaded gasoline. Hope this helped and best wishes.

#1 fresh fuel mix #2 screen inside carb.

I was able to get information from someone's manual. I can't find mine. Would like a manual.