hello bill i have a .91 FX that i have spent the last 2 months trying to get running good i have it rinning on a perry pump.....and was running it on the stock muffler untill it fell apart in flight......now i've got a pipe on it.........well here's my problem......it doesnt start up well....idles like crap and dies after a transition.........it has bubbles in the lines and i cant get rid of them.....the vibration is very low the pump is fine i just cant find out whats wrong with this thing...........i had a .46 LA on my trainer along time ago and it ran great so i know that it should run well..........maybee i will send it in and have it replaced for a newer version.........i just got it 9 months ago.