Running/Idle problems after PAIR and flapper removal - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 22 (permalink) Old 10-25-2013, 07:34 PM Thread Starter
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Running/Idle problems after PAIR and flapper removal

I was lucky enough to find a gently used '03 a couple of months ago that I scooped up quickly. I put it up on stands to do various mods to it but would start it every few days because the exhaust note is sweet (Ti Banzai-mount Satos). This week's project was the flapper mod and PAIR system removal. I used the block-off plates and cover from Kyle Racing and put things back together last night.

When I tried to fire the bike up it didn't want to start, so I gave it some throttle and it fired up; however, once I let it drop to idle it died. Starting it with the choke on kept the idle high enough that it would continue to run on its own, but when I blipped the throttle it would die again. I thought maybe I had a vacuum leak someplace but couldn't find anything obvious pertaining to the parts I had removed. After tinkering a bit I tried again with the same results, but decided to let the engine warm up this time. As it turns out once the temp comes up it idles and seems to run fine, but I'm paranoid now.

I did some reading and a few things stand out as possibilities - vacuum leak, TPS, FPR, PCIII, water/debris in fuel, etc. Before I tear the thing apart again though, I wanted to see if anybody had some more specific advice or similar experience I can learn from; I'm not afraid to work on things but sometimes I don't know what I'm looking for and the service manual is less than helpful in my opinion. I didn't remove the tank to do this work so it's possible when poking around with such little room I bumped or jarred something that would explain everything. Any assistance is appreciated. Thanks.
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post #2 of 22 (permalink) Old 10-25-2013, 07:46 PM
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I didn't see you mention it so I thought I'd throw it out there. Did you try to adjust the idle?

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post #3 of 22 (permalink) Old 10-25-2013, 07:50 PM
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Not bad list so far by everyone. Start simple before going to the difficult stuff. Check the manual for trouble shooting as well. There may be a few more suggestions in it.
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post #4 of 22 (permalink) Old 10-25-2013, 07:54 PM
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Did you plug the vacuum line for the flapper?

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post #5 of 22 (permalink) Old 10-25-2013, 08:37 PM
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Did you plug the vacuum line for the flapper?

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Most probable cause.
Either plug the vacuum line, or cap the fitting on the throttle body.
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post #6 of 22 (permalink) Old 10-25-2013, 08:55 PM
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Did you follow these instructions?

http://www.rc51.org/


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post #7 of 22 (permalink) Old 10-25-2013, 09:13 PM
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At least two or seven times

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post #8 of 22 (permalink) Old 10-25-2013, 09:35 PM Thread Starter
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Wow, I didn't expect to see so many responses when I got back from dinner, thanks everybody!
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post #9 of 22 (permalink) Old 10-25-2013, 09:37 PM Thread Starter
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I didn't see you mention it so I thought I'd throw it out there. Did you try to adjust the idle?

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Not yet. When I started to get paranoid that something else went wrong I decided to stop until I consulted the forums. Could it be as simple as increasing idle speed? I don't recall what it idled at before I made the changes, but I do feel its a bit low based on what the service manual says.
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post #10 of 22 (permalink) Old 10-25-2013, 09:38 PM Thread Starter
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Not bad list so far by everyone. Start simple before going to the difficult stuff. Check the manual for trouble shooting as well. There may be a few more suggestions in it.
I didn't think about the troubleshooting section of the manual, I'll take a look at it.
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