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1978 shovelhead harley davidson #1 cylinder acts like its floodin

It ran fine just started back firing threw the front cylinder just that plug smells like gas

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  • yankmenow199 May 23, 2009

    compression is good have a new setof points ordered lifters feel ok i'm running a s&s carb i checked everything else i'm hoping points do it could it be the coil?

  • yankmenow199 May 27, 2009

    thats what it was found a sever crack on the backside with gel ozing so i replaced it fired rtight up thanks

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You need to take compression check hold throttle wide open when you do this and see what the compression is but pull coil wire first so it dose not start do you have solid lifters or do you have hydraulics ones are you ruining points or electric ignition i would look at these area if compression is good if not bad valve or valve spring what kind of carb are you running check floats the stick some times. well hope this leads you some where

Posted on May 22, 2009

  • Earl Norager
    Earl Norager May 26, 2009

    well sorry long week end yes it could be coil check the spark or replace it they do go out on the shovelheads but it would not heart to think about electric ign. well hope this helps

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1979 Harley Davidson Shovelhead no electrical power battery has 12.8 volts


Hi, David you may have a faulty circuit breaker for this scenario you will need your service, parts fiche, and owners manual if you can not find the best tool you ever bought for your Harley, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a wonderful day.
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Harley davidson 78 shovelhead diagnose and repair manual


Hi, Joseph the vast majority of service, parts, and owners manuals on the internet are "FREE" to download and all service manuals contain wiring diagrams in the back pages. The rest usually charge a modest fee around $10 and there is a handful of rare, obsolete, and very old models that are no longer available. Most of the manuals will cover your exact make, model, and year otherwise one will be provided that comes as close as possible to your bike and will have most of the same info that an exact manual would have. To download your manuals please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a wonderful day.
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I have a 1978 shovelhead,It has been sittin for about a year last time I rode it ,it ran fine but anyway, I went to start it and it was hard to start, but I did get it started.it acted like it was running...


First, check your spark plugs. You said it was hard to start, you could have fouled a spark plug or since Shovelheads did not come from the factory with valve stem seals, oil could have run down the valve stem and dripped onto the spark plug fouling it.

If the plugs look good, it could be a vacuum leak at the "rubber bands" on the intake manifold. They do dry rot over the years and you might have a leak.

Or, it could be that the carb needs pulling, disassembling, and cleaning. Start with the least expensive thing first and work up.

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Make sure your hotwire to the coil is making a good connection. Check air intake manifold for air leak - o-rings can be tricky to get installed correctly. Finally, change carburator jet to richer mixture. Popping backk through the carb means lean fuel mixture.

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