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  #1 (permalink)  
Old 08-03-2011, 07:29 AM
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Carb Sportster could leaving off the MAP sensor be the cause of my problems?

In my first attempt to covert a Sporster that was set up for EFI to a carb I used the fuel injected manifold and just welded up the injection ports. When I fired it up all seemed normal at first but the bike died as soon as the clutch was engaged. After a few attempts I figured out that it can be ridden by keeping the revs way up and very slowly slipping the clutch so that it is never under much load. but it will still die right away when given the slightest load. Is this more likely an intake manifold leak or is the result of my ICM not having a reading from the MAP sensor which the EFI models dont use? Or is there something else i should be looking into?
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Old 08-03-2011, 08:47 AM
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Glad to see you on


Found this with google search
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Josh man, don't take this the wrong way, but what is a person who believes that an ECU might "run" a manually shifted transmission on an air-cooled motorcycle doing talking about "building" a bike?

More importantly, that sorta comment makes me wonder if you've really done your homework regarding why you would or would not want a carburetor or EFI.

Frankly, though I have no problem with carbs, I find that the simplicity and dependablity of EFI is just worth it. Instant throttle response, quick starts, no fouled plugs from over-using the enrichener valve.

OK, all that said, if you MUST butcher a new bike to do this, yes, no problem it CAN be done. However I believe you'll need a new ignition system since the ECM runs that as well. I imagine it's as simple as securing the relevant parts from an 04-06.

There may be a thread about it too, as every 6 months or so someone who doesn't like EFI (usually because of misinformation or just prejudice built from decades of carb work) brings this up.

Best of luck with whatever you decide,

Kev
did you swap the ignition?
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Old 08-03-2011, 02:41 PM
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Found this with google search


did you swap the ignition?
Yes the whole ignition circuit is as the 2005/2006 bikes.....except there is no MAP sensor.
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Old 08-03-2011, 04:38 PM
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the engine will die without the mapp sensor if you have an electronic ign that includes a mapp circuit. it should go into default mode but it won't run that way.
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Old 08-04-2011, 07:03 AM
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Quote:
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the engine will die without the mapp sensor if you have an electronic ign that includes a mapp circuit. it should go into default mode but it won't run that way.
Actually I found out that putting an o-ring on the carb and shoving it into an EFI manifold doesn't create an air tight seal, but add a few wraps of electrical tape and shazam it is running as nice as you could hope for with an 883. I am sure that I am not getting the spark advance I should be but it is good enough to ride for now.
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