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Can I (or should I) change the main jet, and by how much? Also, the idle varies by what sounds like 800-1000rpm. Kinda wants to die before spinning back up again. Seems to run okay at full throttle. This is for a snow blower btw engine 1024 (1696610)

So I just bought a new FJR I plan on keeping for a very long time, but certainly not until the engine is worn out. I guess I just want piece of mind that the oil I'm using is doing it's job. I have no problem changing my oil every 3-4000ish miles but I may take trips that are as long as 5000...