havent started breaking in my OS .12 CVR yet, hopefuly weather this spring break will allow. How many gallons will my OS last? And how many tanks should I break in?
3-4 tanks taking it very easy, keep the temp ABOVE 200_F and below 260_F for break-in.
Once you have 4 or more tanks through the engine, you can start to lean it out for more power. Most O.S.'s will make good power around 240_F and still run decent at 220.
Expect around 9+ gallons of fuel, If you never overheat your engine and always run the tank dry, then use after run oil.
O.S. engines are very reliable power as 'Skully' stated. Usually though, they tend to priced higher than average. Look for a sale to get one at a decent price.