Marine Carburetor Tuning Part 1

This has been one of the most requested videos I've seen this season--you ask, I deliver. Keep in mind I wanted to get this first part to you all, so you could order your vacuum gauges. I haven't seen many automotive stores carry these vacuum gauges. Stay tuned! There will be a part 2!
The vacuum gauge I'm using for this series is:
www.amazon.com/ABN-Vacuum-Fue...

[@vincedang384]

Good timing Micheal! Good video too on the 4160 rebuild. I'm rebuilding similar carb for my 67 RS Camaro with a 327 cu. In. Just finished rebuilding the motor. Thanks for your detailed rebuild and keep up the excellent work. Vince

[@edelpena8665]

Best tuning video I have seen you are fantastic thank you

[@AwesomeFuture777]

Great video. Will be working on my newly acquired 1990 Ford 2.3 marine outboard motor

[@scottsnyder4507]

This was super helpful. Thank you!

[@sjd7188]

The clogged hose nipple on side is over flow from the mechanical fuel pump. In a marine application fuel pump with have a small nipple on it 1/4” tube up to nipple on carb. If diaphragm in fuel pump rupture this puts fuel down carb vs in the bilge. Main diff between automotive fuel pump and marine

[@michaelromer2016]

Here is a video I did with that in action. OMC Cobra & Volvo Penta - Boat Almost Exploded! kzbin.info/www/bejne/p5_FXmWej9ljrqs

[@NCSUME1]

Thanks for this video. I'm helping my friend rebuild a 2 barrel version of this carb. I don't think the kit we have has the correct idle needle gaskets (there are no "cork" gaskets in the kit). But this was extremely helpful!

[@michaelromer2016]

Check out holley’s website, the rebuild kit is what I recommend.

[@Steve-mt6de]

Where is the fast idle screw ?

[@michaelromer2016]

Check this out How-to Find Boat Parts kzbin.info/www/bejne/pqalYnitZpyghKs

[@buzzbikegearofficial]

Thx!!

[@michaelromer2016]

I got you covered

[@ealex1312]

Perfect timing on the video Michael. I just overhauled the engine (4.3 GL) using your awesome videos and had starting issues after the engine installation. Had narrowed it down carb issues (fuel delivery - check, ignition -check). Rebuilt it and installed, but having issues keeping the engine running. Fires up after pumping throttle, but dies after that fuel is burned off. I’m guessing fuel mixture at this point. Will work through with these baseline settings and adjust from there. I always sucked at carburetor tuning beyond the curb idle. Always get hung up on the mixture screws. Great video and much appreciated. Any tips on adjusting the mixture screws beyond baseline settings?

[@michaelromer2016]

Have you checked the fuel pressure? I bet you have a faulty fuel pump--just a thought. Make sure your fuel filter isn't backwards or clogged. Also there is a anti-siphon valve that needs to be checked on the fuel tank.

[@briansmith-hn6ho]

The hose going down to the fuel pump is there to let you know your fuel pump diaphragm is leaking. If there is gas in the clear hose, you need to change your fuel pump.

[@michaelromer2016]

That’s a good catch! Please hit that subscribe button for more content! Thanks.

[@mrzif0013]

hi mike. off topic, 1996 3.0 merc i/o trim goes down but not up best guess? pump is fine, fluid is full. what do you think?

[@clanofobrien5340]

I'm interested in seeing where you connect the vacuum gauge. I can't find a vacuum line off of my carb. After watching your videos I have my boat running much better but would like to fine tune the idle circuit. Hopefully part 2 video also touches on adjusting the choke. My engine doesn't like to idle when cold.

[@michaelromer2016]

Thanks for watching. Rotate the chock to allow for a much richer mixture. Also make sure you have a good ignition system--cap and rotor, plugs, wires, plugs. I will have a part 3 where I show some other places to find vacuum ports.

[@AwesomeFuture777]

Where's part 2?

[@rhender]

Is it possible that I am not able to adjust my choke? Mine seems to be fixed in place. I have a marine carburetor that looks almost identical to yours. It is a Holley 2300 marine carburetor. Your vids are a life saver.

[@andrewsiddells2325]

Followed your video. Have reduced black smoking. Should adjust a little further on chok

[@michaelromer2016]

Thanks and don’t forget to subscribe!

[@chuckzettler1069]

Hey great video. You Mentioned you have a video on adjusting the carb On the boat I’m having trouble finding that video. Do you know the date you posted it? Thanks.

[@michaelromer2016]

Check out part 2 under the search field. Please subscribe!

[@jaimereyes7480]

Would all these settings apply for this carb on a 351w?

[@methods-SE]

Ohhhhh yes. Was just seeing today that my auto-choke seems to do absolutely nothing. Lets see if I can figure it out .... after watching just this set of videos* -Schindler

[@rickwahrlich6259]

I didn’t see the link to the rebuild kit.

[@brianf2580]

What do you do with the vacuum guage? Also, does the 1.5 turns apply to all holley carbs? I have a 2 barrel for a 3.0L OMC

[@robc3863]

I think the vacuum guage must be shown in part 2, where is part 2?

[@brianf2580]

@@robc3863 just fyi 1.5 turns out was a good starting point for my 2 barrell holley for the 3.0 omc cobra

[@rickwahrlich6259]

There is a small clear hose that attaches to the side of my flame arrestor. Can I use that to connect the vacuum gauge?

[@slalomking]

No

[@dickdykstra2234]

What about the high idle while on choke i can't find an adjustment on my Holley marine. Is there one?

[@michaelromer2016]

What year is your carb? What is the motor?

[@dickdykstra2234]

@@michaelromer2016 Got the carb last year from Nat Carb it is on a 351 in a 21 ft jet boat. It starts real hard lots of cranking even when warm. Any ideas?

[@dickdykstra2234]

@@michaelromer2016 I bought it last yr reman from Nat Carb it's on 351 in a 21ft jet. It starts hard lots of cranking even warm.

[@guillermomoreno2444]

I have a 5.8 pcm marine engine were can I get the kit

[@michaelromer2016]

Check this out How-to Find Boat Parts kzbin.info/www/bejne/pqalYnitZpyghKs

[@NeverEnoughPyro40]

I can see your knowledge on boat engines is limited, that vacume port on top of the carburetor does not return fuel back to the fuel pump! It is there just in case the diaphragm in the fuel pump goes bad! On cars if your diaphragm goes bad they would drip fuel onto the ground, you don't want fuel leaking into your bilge so it returns it to the carburetor! Think about it how can you return fuel to the fuel pump if that Port has vacuum! That is a perfect example on why the average person should not work on Marine engines!

[@michaelromer2016]

Correct, I have no idea what I’m doing in any of my videos. I’m not sure why I have over 100 unknowledgeable videos and a global following with over 1.5 million views.

[@jordanm6473]

Neverenough is correct though

[@slalomking]

I concur, that is a line that sends fuel into the carb to burn it up instead of letting it empty into the bilge, a fire hazard.

[@AwesomeFuture777]

Here's part 2 guys! kzbin.info/www/bejne/rILEo5KLf9BkndU