I have an OS 48 Surpass and a Saito 65 both of which were put away improperly. This was some 20 years ago. Need less to say they are a bit gummed up now. I'd like to bring both back to life, as I am slowly returning to the hobby. Thinking that I can soak both in some fluid for a while to dissolve the gum, prior to trying to run some fuel through them. I'd rather not disassemble either motor, as I don't have a reassembly check sheet, or feeler gauges, for either. If I did have those items, I'd rather do just the opposite, and take them all the way down. Thing is, can't recall best solvent to use. I do have a couple of gallons of 2-stroke fuel, unopened, about the same vintage(lots of years old). I'm thinking this might just do the trick as a solvent only. Opinions or suggestions?