I have an Echo PB 650 that has run strong until last week when it cut out suddenly and died within about a second's time. When I attempted to restart the cord would not pull and I set it aside and used another unit. I took a look at it today, removed the starter assembly and noticed a small piece missing out of the "cup" inside the crank assembly, but could find no missing metal. I turned the crank by hand and after a little sticking it would rotate. I reattached the pull cord assembly and tried to fire it up. It does pull smoothly now even with the broken cup inside. No luck. It seems like there is not as much compression as it needs (sound and lack of resistance). I checked the plug and replaced it, then tried again. It definitely gets a nice spark, but won't start or even hiccup. I checked the compression and it is 60psi, which I suspect is low. I don't have the specs on it, however. The unit is about 5 years old so I'm not looking to dump much money in repairs into it, but if anyone has an idea what to look for I'd appreciate the help. I have run multiple other 2 cycle equipment with the same fuel for a few days so I doubt low oil in the mix is the culprit. It did run very strong till it suddenly stopped, so it's not the gradual wear you see with age.