I would advise getting a professional rebuild done if the advice here does not help.
There are some other things you could try, such as spray or liquid cleaners, but the residue will go through the engine. The Atomic 4 does not have high compression or cylinder temperature so those chemicals are going to get to your exhaust hose or possibly past the rings. Maybe not, but I would not risk it. It is easy to remove the fuel pump water settling cup, partially fill it with carb cleaner, and then idle the motor. That will clean the idle circuit reasonably well. The chemicals used at a rebuild shop will clean all the gum and varnish off. A spray just is not strong enough and does not sit concentrated long enough. A rebuild should also include adjusting the carb on a wet flow bench. The shop will use the flow bench to set air/fuel mixture to spec usually at a few points, 1) on choke 2) idle 3) wide open throttle They will also know if the carb is not adjusting correctly, something very hard to guess at when trying it on a live engine. The Zenith carb on Windburn was rebuilt by Carburetor Rebuilders Company Limited in Toronto for about $200. They are at: http://www.carbrebuilders.com/ Mike C&C 30 Windburn Message: 2 Date: Mon, 19 Aug 2013 20:48:23 -0400 From: "Michael Dean" <md...@ca.inter.net> To: <cnc-list@cnc-list.com> Subject: Re: Stus-List Atomic 4 Carb things to try. Message-ID: <013401ce9d3e$f98e2a60$ecaa7f20$@inter.net> Content-Type: text/plain; charset="us-ascii" Danny, I am assuming that you didn't forget to try adjusting the idle mixture screw. (I forgot one year - duh!) Did it have any effect? It may also be worth loosening the distributor and turning it back and forth 10 degrees or so, though timing as very non-critical on the A4. Another thing to try is to slowly pull the choke out in small increments. If it idles better then something in the idle fuel path is likely plugged a bit and it is running lean at idle. Another possibility is the float valve isn't closing perfectly and at idle too much fuel is entering the carb. Sometimes the float valve can be freed up by shutting off the fuel supply and letting the engine run until the carb is empty. Open the fuel supply valve and start the engine - will take a moment or two. The rush of fuel into the carb can sometimes clean the float valve if it is a bit gummy. I also assume the plugs are good and properly gapped. All I can suggest that doesn't require removing the carb again and blowing out the various jets with compressed air. Mike -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of djhaug...@juno.com Sent: August-19-13 2:55 PM To: cnc-list@cnc-list.com Subject: Stus-List Atomic 4 Carb rebuild Hello all, I'm looking into rebuilding my carb. I'm having some idling issues and It's getting better and better but I think It should be better still. When I looked inside the carb. It was dirty and gritty...no good, I sprayed it all with carb cleaner. Although it is better I want to try a rebuild and more aggressive cleaning. I've found the moyer rebuild kit at $87.00 + shipping then I found this one for $26.00 and I could buy 3 for the less and get free shipping... http://www.carburetion.com/Products/ProductDetails.aspx?Part=KT-5535 It seems it is even a better kit in that it has more parts, specifically, it seems to have the throttle arm seal and cap in it. Is moyer really just price gouging? he even charges another $12.50 for his tech tip videos on trouble shooting you carb. I mean I'm all for a guy making a buck but, you'd think if he is charging more than triple on parts, he could throw in the videos... I'll probably pay the $12.50 to see it, especially if I save all that dough on the kit! Then, I don't have to feel guilty about not giving the guy my business... I mean I'd hate to see him go out of business... Anyway, maybe this is a substandard kit? Also, I have a rebuilt carb that I did last year before I knew I was buying the Moyer exchange engine. So, I'll swap that in, I would just like to have a rebuilt one on standby... I also found a farm tractor supply selling the whole carb for $175.46 Moyer wants $270 http://www.farmersserviceinc.com/marine.htm Any comments or suggestions are always appreciated! I thought this could be good infor for the other A4 boats... if there are any left LOL Danny
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