ORIGINAL: KC36330
if you're flying JetCat just swap to off board propane and ditch the PowerMax, save the solenoid valve (those things ain't cheap) and fly with onboard weight. Some Jet Central and Wren turbines don't like the off board propane without all the onboard gadgets to help regulate it but JetCat's fire up first time every time and it's so easy my 6yr old can do it.
I'm not following you when you say "fly with onboard weight".