My daily driver has a 250/monojet and I have to choke it every first start of the day. I'm not real sure which mono it is, I never have looked at it very close. As long as it keeps working good, I'm cool with pulling out the choke once a day. I'm just a little bit higher than Denver at 5500' and it runs great, but it sure does run better down at 4200' in the Salt Lake Valley. I'd love to see what it would do at sea level. She gets real winded at 7000'+, though, but I'm not up there too much.