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  Topic Review (Newest First)
05-01-2012 08:07 AM
Re: Anyone ever modify and atomic four?

I agree that in most applications the A-4 is probably more power than can be practically applied anyway. I would opt for increase reliability and smooth operation.
02-23-2010 09:51 AM
Originally Posted by bljones View Post
How is a downdraft carb a "bolt on" to an updraft manifold?
That is one of the things I want to see, if it had a big U bend in it it would likely be worse than the updraft, but the kit may also come with a new manifold?? Not likely but worth looking in to.
02-23-2010 09:44 AM
bljones How is a downdraft carb a "bolt on" to an updraft manifold?
02-23-2010 09:27 AM
Originally Posted by xsboats View Post
Go to Foley's website. You are looking for a Zenith carbuerator. It is listed as a Universal PN U288482.

That is the stock updraft carb. didn't you have a downdraft. I am definitely curious to see the setup.
02-23-2010 06:49 AM
xsboats Go to Foley's website. You are looking for a Zenith carbuerator. It is listed as a Universal PN U288482.
02-22-2010 07:19 PM
Originally Posted by xsboats View Post
There is a replacement downdraft carb available for the Atomic 4 . I put one in my Alden back in the 90's for $180 . It was a bolt on installation with no mods needed. I think I got it from Hale Marine. The flame arrestor from my old updraft fit on it as well.

Thats really what i'm looking for, do you have any more information on that?
02-22-2010 06:55 PM
nickmerc I added electronic ingnition last winter to my A4. I found that for the same price as two sets of points and condensers I was able to but the electronic ignition. It took about an hour to swap out the ignition and it was well worth it. My engine runs smoother and I do get better fuel economy. Plus there is little to no maintenance to worry about. I got mine from Moyer for about $100.

As said before if it already drives the boat at hull speed there is not much need for more power. However, if you can have a more reliable and efficient engine, that may be worth some upgrades.
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02-22-2010 06:32 PM
sailingdog I'd point out that adding an EFI system is probably a really stupid move. The bilges on most small sailboats are prone to getting wet...and keeping the engine as simple as possible is probably a good idea. Replacing the distributor cap, rotor and points with a hall-effect distributor might be a good idea, as that is going to be more reliable...but electronic fuel injection, not a good idea IMHO.
02-22-2010 05:36 PM

Amazing but IF you can do simple repairs on a lawnmower you can go through and A4 and make it run
02-22-2010 05:11 PM
ViribusUnitis What about a EFI or even electric engine control system?

A TBI MAP system should be fairly easy to arrange. And it would probably be MUCH better than a carb. Start up quicker, be more efficent, etc.

Would you pay a couple hundard for that?
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