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220 gpu won’t start???

Posted: Thu Apr 11, 2019 9:43 pm
by 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. :rebel: :banghead:

Re: 220 gpu won’t start???

Posted: Thu Apr 11, 2019 9:55 pm
by diesel250rr
Timing or compression if you have fuel air and spark

Re: 220 gpu won’t start???

Posted: Fri Apr 12, 2019 10:21 am
by 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

Re: 220 gpu won’t start???

Posted: Fri Apr 12, 2019 11:51 am
by southern safaris
GMAC 76 wrote: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?

Re: 220 gpu won’t start???

Posted: Fri Apr 12, 2019 12:32 pm
by 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.

Re: 220 gpu won’t start???

Posted: Sun Apr 14, 2019 6:48 pm
by 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