Holley 4150 Carb Rebuild

[bludpumper]

I just recently successfully rebuilt my Holley 4150 Carb off a Indmar 310.
It came out of my 2006 Mobius LSV.
If anyone has any questions or would like help with a similar project please feel free to ask.
I had never done it before, learned a lot, made a few mistakes, but went from a non-running boat to a boat that runs super good.
Anyways, hope you all have a trouble free summer but if you get in a tight spot I'd love to help if I can!
Cheers!

[Mikes]

Cool,most guys seem to be a little afraid of that project.

[kaneboats]

Dang proud of you. Wish you would have done a full pic HOW TO though for the carb guys on here. Maybe next time.

[bludpumper]

I have had my boat out a couple times since rebuild and it runs strong!

I do have a question for those of you who are more savvy than me on tuning the 4150 Carb?

When I drop in water for first cold start, it will not start unless I turn in main idle screw about 1.5-2 full turns. Then it fires right up but obviously is idling high (1500-1600 RPM). The choke then goes through cycle opens completely and then i can turn out idle screw to normal value (~850-900 RPM).
The boat will then start fine for the rest of the day at that idle screw setting?
What am I missing? Float levels seem correct. Air mixture are at 1.5 turns out and it idles great?
Thanks for all responses....It's finally warming up out there. My 11 year old daughter just had her first set on Monday! We had the whole lake to ourselves....

[DOCDRS]

if you do a step by step, maybe even pics if you have them it would be a great how to for the how to forum

[sandm]

my buddies '94 boomerang would not run this spring. he had too much fogging on the plugs he replaced last fall. while tinkering, I noticed that his carb is horribly dirty. I have never had much luck with them. an faq would have been nice. I told him to get his neighbor to do it for him

on the positive, cleaned the plugs and it's running awesome, but does need a carb clean/rebuild.

[Hutch5]

On your carb rebuild bludpumper did you notice any flaking internal to the carb/fuel bowl? My fuel bowl was leaking about half through this last weekend. Noticed the fumes while out on the water and saw that gas was dripping on a hot engine! Ouch! Tried to tighten the fule bowl screws and cracked the bowl causing it to leak more. End of our weekend on the Moomba anyway. I have 2006 LSV with Indmar 310 and Holley 4150. I pulled the bowl off, cracked threaded fuel inlet in the process, and later put my finger through the side of the bowl. It was very brittle and flaking significantly. I found today that Holley apparently has reported casting issues with 05 and 06model carb fuel bowls. I am calling first thing tomorrow and hope to get mine replaced as I have found other examples of exactly what mine looks like on auto repair forums. Will post and update after I talk to them. But if you have this setup, definitely check the fuel bowl. I cringe when I think about this crap floating around the engine.

With respect to starting, at least prior to this issue, I always have to prime for awhile before I get going on a cold start. I have thought it was electric choke issue but not sure. I have started using a shot of starting fluid into the carb and it starts right up. Saves starter and battery alot of stress. Hopefully no side effects from this approach.

Thanks, Hutch

[Moombaskier]

I just recently successfully rebuilt my Holley 4150 Carb off a Indmar 310.
It came out of my 2006 Mobius LSV.
If anyone has any questions or would like help with a similar project please feel free to ask.
I had never done it before, learned a lot, made a few mistakes, but went from a non-running boat to a boat that runs super good.
Anyways, hope you all have a trouble free summer but if you get in a tight spot I'd love to help if I can!
Cheers!

I have a Moomba Outback 2006 310 that does not run right when I reach 30 to 35 MPH. The engine loses acceleration. Although I keep the throttle lever at the same position, the engine will decelerate and then after a few seconds, it will accelerate again. It continues until I throttle down to a lower speed. At low speeds, the boat runs fine.

So far, I have done the following:
Replaced distributor cap and rotor
Spark plugs
Fuel filter
Sea Foam in the gas
Sprayed Carpuretor cleaner

Yet, no luck in resolving the issue.

Do you have any ideas of what may be causing this? I feel that it may be related to the carburetor.

[MJR63]

Sounds like bad gas to me. Add another can of sea foam and fill up with fresh gas. I had a similar problem and after about 15 min of running the boat it was Resolved. Let me know if that works.

Good luck!

[Moombaskier]

Thanks for the advice. I plan on siphoning the gas and refilling with fresh gas and more sea foam.
I will let you know if it resolves the issue.