220 GPU , Holley 500 Main Jet size.

Aircraft powered airboat discussion.
Post Reply
User avatar
jopete
Site Supporter - II
Site Supporter - II
Posts: 977
Joined: Mon Mar 30, 2009 8:07 am
Location: loreauville, la

220 GPU , Holley 500 Main Jet size.

Post by jopete » Thu Sep 18, 2014 8:58 am

while swapping out my mag yesterday, i got to looking at my flexpipe and man it looks like that boat is running rich. it's always been like that since i've had the boat. i'm thinking my next project will be to tear the carb abart and see what size the main jets are and rejet accordingly.
the boat starts awesome, cold or hot now, just thinking that i still have some power not being used.

anybody know what size main jet they are running in their holley 500 with a stock GPU to give me a referance point? i have used the search feature and learned alot, but most carb questions seem to get sidetracked and end up talking about cutting their grass or eating crabs or stuff like that!!!!!!

thanks

User avatar
scottyroll
Site Supporter - I
Site Supporter - I
Posts: 885
Joined: Tue Mar 10, 2009 8:19 pm
Location: JAX/Ocala

Re: 220 GPU , Holley 500 Main Jet size.

Post by scottyroll » Thu Sep 18, 2014 9:12 am

:Scotty-Roll:
FLAwless

1999 14ft Alumitech deckover. ZZ502. 2.37 Stinger. 4 blade WW Falcon Prop

GMAC 76
Site Supporter - V
Site Supporter - V
Posts: 1243
Joined: Sun Jan 04, 2009 11:12 pm
Location: LAKE PLACID FL.... LAKE ISTOKPOGA

Re: 220 GPU , Holley 500 Main Jet size.

Post by GMAC 76 » Thu Sep 18, 2014 12:13 pm

scottyroll wrote:This thread may help ya out.

http://www.southernairboat.com/phpBB3/v ... 47&t=50427
yea I remember that was my post and we ended up with #74 jets everything else remained as it was out of the box and the plugs showed a nice clean burn top and bottom with the 74's......maybe a tad fat but better than too lean imo......also ya might get a better fuel burn with that new mag in there now might be worth a look see before ya start changing jets

User avatar
jopete
Site Supporter - II
Site Supporter - II
Posts: 977
Joined: Mon Mar 30, 2009 8:07 am
Location: loreauville, la

Re: 220 GPU , Holley 500 Main Jet size.

Post by jopete » Thu Sep 18, 2014 1:29 pm

thankyou gentlemen !!! once again my brothers here at Southern Airboat have pointed me in the right direction!!

User avatar
LJohnson
Southern Airboat Member
Posts: 54
Joined: Sun Feb 02, 2014 8:44 pm

Re: 220 GPU , Holley 500 Main Jet size.

Post by LJohnson » Sat Sep 27, 2014 1:01 am

My GPU is all stock other than the carb, which happens to be a holley 2 barrel, 50cc accelerator pump, cheap $15 Advance Auto air filter, and I plugged all vacuum lines. Works like a champ.
220GPU, Big-O Hull

Post Reply

Return to “Aircraft Power Only”