I have a Yamaha EF2400iSHC Generator. 4-stroke  171cc engine. A buddy of mine borrowed it a couple years back, when done he ran the gas out of it and ... we thought it was good.  Well... NO  there is a drain on the carb. bowl we didn’t use. I can get it started but it runs very unevenly. I have a bottle of both 0116 and 2616 and in another thread (2003 Suzuki Volusia Motorcycle) you suggested: "you might try either 0116 as-supplied or dilute a bit of 2616 with 0116" What ratio of  2616 to 0116 might you recommend, and how long should I let it soak? THANKS! Jim