2 hours to perform a basic tune - up on a simple engine is a little steep. If you can't change 2 spark plugs and an air filter while the oil drains in 10 minutes, you need to come spend some time at the farm. Spin off the oil filter, spin on the new one and fill the oil. If you make a note of the exact amount of oil the crankcase takes you don't have to check the dipstick when your done (if the amount of oil in the drain pan looks correct), not that that takes more than a minute.
Pay $200 if want for that, but would you pay $200 for a vehicle tune - up every year? Think of the difference in the number of hours of run time with just a normal oil change interval. The Generator cycles weekly to test itself. It is likely never running when you are kicking up dust with the lawnmower, so the filter is likely clean.
If you create a relationship with a good local electrician, you wouldn't likely pay for travel time.
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