220 gpu won’t start???

[Pcairboater]

Just looking for some advice on my 220 gpu... I just bought this airboat and fairly new to ground power units. I’ve been doing some rewiring due to the fact when I bought it the guy had everything apart. I’ve come to the point where I have spark and fuel but I’m not able to get the motor to fire. Am I using the wrong spark plugs or missing something. I’m about to take it to a shop just looking for some advise before I spend a ton of money to have someone work on it. It has a Holley 4150 that maybe be out of adjustment also.

[diesel250rr]

Timing or compression if you have fuel air and spark

[GMAC 76]

I agree with diesel250….if ya have fuel, air, spark and compression and it wont fire I would look at the engine/magneto timing

[southern safaris]

I agree with diesel250….if ya have fuel, air, spark and compression and it wont fire I would look at the engine/magneto timing

X3 on mag timing.... is it sputtering or coughing at all,any signs of a heartbeat?

[John Fenner]

Make sure mag is off, "grounded" pull prop through by hand, if you don't hear a click at each compression stroke, the impulse coupler spring is broken.

[Pcairboater]

It has spit and sputtered trying to fire up on its own but it won’t keep the heartbeat... southern safaris. I’m taking it to someone this week to see if it’s a timing issue. I don’t even wanna try to mess with timing myself. Thank you guys