Flapper mod trouble - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 28 (permalink) Old 12-22-2011, 11:40 AM Thread Starter
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Flapper mod trouble

Just performed the flapper mod step by step off the rc51.org website. Now when I start my bike the fuel injection light blinks slowly. Do I need to plug the sensor in the snorkel as well as the solenoid back in?

Thanks,
Bret
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post #2 of 28 (permalink) Old 12-22-2011, 11:46 AM
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When you do the flapper mod you can literally unplug and remove everything associated with the flapper valve and throw it away. The solenoid is not in the diagnostic loop of the ECU during start-up.

The one thing that has to be done is the one vacuum line that routes back to the throttle body ABSOLUTELY HAS to be plugged to keep air from leaking into the throttle bodies.


Now if you removed or unplugged any other sensors while doing the mod then of course those need to be reconnected and would also cause a MIL fault code to present itself.
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post #3 of 28 (permalink) Old 12-22-2011, 11:53 AM Thread Starter
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I think it was refers to as the BARO sensor. Does that need plugged in? I will also find a different plug for the hose maybe it's not sealing it all the way.
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post #4 of 28 (permalink) Old 12-22-2011, 11:59 AM
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The BARO sensor is on the snorkel, the MAP sensor is on the throttle body (same sensor type, just different use).
Both sensors must be connected for proper operation.
The BARO sensor measures inlet air pressure, while the MAP sensor measures intake manifold pressure.
Together they're used to calculate injector timing for fuel delivery.
The engine will still run, but as well as it could.
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post #5 of 28 (permalink) Old 12-22-2011, 12:15 PM Thread Starter
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Thanks guys!
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post #6 of 28 (permalink) Old 12-22-2011, 01:15 PM
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Quote:
Originally Posted by LDH® View Post
When you do the flapper mod you can literally unplug and remove everything associated with the flapper valve and throw it away. The solenoid is not in the diagnostic loop of the ECU during start-up.

The one thing that has to be done is the one vacuum line that routes back to the throttle body ABSOLUTELY HAS to be plugged to keep air from leaking into the throttle bodies.


Now if you removed or unplugged any other sensors while doing the mod then of course those need to be reconnected and would also cause a MIL fault code to present itself.
Was it you that put up the How To for that flapper mod? If so, thanks! I used it early on in my RC51 rebuild. Along with tons of other info on that Mods page.

John, 2000 RC51 #000100

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post #7 of 28 (permalink) Old 12-22-2011, 01:20 PM
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I didn't come up with the original mod I simply put it to the test and then hosted the how-to article on my RC51.org site.
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post #8 of 28 (permalink) Old 12-22-2011, 01:40 PM
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Ahhhh, I thought that was you. Well, that Mods page has been refered a thousand times in the last year I've been here! Thanks for keeping it up and accessible to all. I've spent many hours there myself pouring thru all the info.

John, 2000 RC51 #000100

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post #9 of 28 (permalink) Old 12-22-2011, 01:57 PM
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Ya are you going to close that great site?

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post #10 of 28 (permalink) Old 12-22-2011, 02:10 PM
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I've already stopped taking new members and have intentions of shutting down the forum next March although the website itself will most likely remain up indefinitely or until global financial collapse etc
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