JLG Manlift 40H Problem Solving

[LTC1967]

Hello all, I have a JLG 40H the engine is LRG-425I-6005-A with Gas/LPG fuel and I'm having to a crank for a extreme extended time, then back firing when it starts, but runs fine after starting. Hope someone has some ideas on what could be happening.

 

[harveje]

my 40ha is the same way, gas has been disconnected but LPG is active and after it first starts it's fine

 

[LTC1967]

I'm suspecting oil pressure switch may be causing ignition current delay, trying to figure out if they can be by passed or if there is a way to check them for issues.

 

[ToddOwen]

i have same problem