Respectfully, I have had the complete opposite experience in the same circumstances. I’ve personally blown up 3 on fires. I don’t know if it’s because with all the weight reduction they can’t handle heat as well as the older models, but my crew has gone back to ms 440’s and 460’s. They have a bad habit of boiling the gas as well making them run like garbage until they cool down, whereas when a 440 starts boiling they just keep going. I’ve heard complaints from multiple crews from multiple locations and agencies that they’ve had the same issues, it seems most are related to running them with whatever local gas and oil and ratio then going to a new location and getting different gas and oil and usually a different elevation, after about 3 tanks they just quit running, won’t restart, let them cool down and they’ll restart but won’t idle, hot restarts you have to reprime them, etc. Kind of sad, the 500 was supposed to be lighter and make more power which is perfect to hike with and cut hotline but not if they don’t run