PAIR system electrical - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 8 (permalink) Old 08-26-2015, 02:51 PM Thread Starter
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PAIR system electrical

I may be screwed up ( F.O. in advance Embee) but reading the service manual I am a little confused. On the pair solenoid does it open to allow exhaust gas flow when the solenoid is powered by the battery or closed. My 07 VFR manual reads about the opposite of the RC51.

I was thinking about just disconnecting the solenoid and attached a blocked off connector to both ends to protect them and see how it runs with my PW deactivated. I don't want to dig into the bike to unconnect the electrical connections if it will put in 100% activation by unplugging it. (I don't feel like tearing everything related to the PAIR off the bike just deactivate it)

Thanks in adavance...

Nick
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2000 RC51 - stock owned since new 5/2000
2006 RC51 - 2nd owner purchased 4/2015 with 1400 miles
1996 CBR900RR - mild resto/mod - done spring 2012
1990 Honda VFR - original stock owned since 1991
1975 Kawasaki S3 - restored in 2004-5 (sold 10-17)
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2007 Honda Interceptor 25th Anniversary purchased 7/2014
1972 Honda Mini Trail - 1st restoration in 1992, and 2016 restored to like new condition. (sold 2/18)
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post #2 of 8 (permalink) Old 08-26-2015, 03:03 PM
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The PAIR solenoid is opened to allow air to enter the exhaust ports to burn excess fuel in the exhaust pipes.
That's why you get popping on deceleration.
The extra air leans out the AFR inside the exhaust pipes causing the mix to combust.
It's also why you have to block or disable the PAIR system to get an accurate reading during a mapping run on the dyno.
Disconnecting the PAIR solenoid prevents the solenoid from opening the PAIR valve.
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post #3 of 8 (permalink) Old 08-26-2015, 03:14 PM Thread Starter
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Thanks... I did not get any popping on decal when I added my Ladybird pipes so I figured it wasn't working or disabled. I was gonna disconnect the solenoid to make sure. Probably why my dyno run has 15% added throttle at 0% throttle opening. My dumbass..

2000 RC51 - stock owned since new 5/2000
2006 RC51 - 2nd owner purchased 4/2015 with 1400 miles
1996 CBR900RR - mild resto/mod - done spring 2012
1990 Honda VFR - original stock owned since 1991
1975 Kawasaki S3 - restored in 2004-5 (sold 10-17)
2003 Kawasaki ZX7R - bought 10/2018
2007 Honda Interceptor 25th Anniversary purchased 7/2014
1972 Honda Mini Trail - 1st restoration in 1992, and 2016 restored to like new condition. (sold 2/18)
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post #4 of 8 (permalink) Old 08-26-2015, 03:16 PM
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Originally Posted by Motleyfan View Post
(I don't feel like tearing everything related to the PAIR off the bike just deactivate it)

Thanks in adavance...

Nick
why not? it takes all of 5-10 minutes, and it cleans up around the engine, not to mention the weight savings!

it truly is useless emission crap.
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post #5 of 8 (permalink) Old 08-26-2015, 04:51 PM
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Quote:
Originally Posted by Motleyfan View Post
I may be screwed up ( F.O. in advance Embee) but reading the service manual I am a little confused.
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My dumbass..
After an opening and closing like this....I decline to follow up.

Getting old sucks, if you need help its okay.



The very first schoolbook that was written had God all over it. --Dave Mustaine
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post #6 of 8 (permalink) Old 08-26-2015, 05:24 PM Thread Starter
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After an opening and closing like this....I decline to follow up.:
You're getting soft if you passed on an easy setup like that one.

2000 RC51 - stock owned since new 5/2000
2006 RC51 - 2nd owner purchased 4/2015 with 1400 miles
1996 CBR900RR - mild resto/mod - done spring 2012
1990 Honda VFR - original stock owned since 1991
1975 Kawasaki S3 - restored in 2004-5 (sold 10-17)
2003 Kawasaki ZX7R - bought 10/2018
2007 Honda Interceptor 25th Anniversary purchased 7/2014
1972 Honda Mini Trail - 1st restoration in 1992, and 2016 restored to like new condition. (sold 2/18)
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post #7 of 8 (permalink) Old 08-26-2015, 05:31 PM
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You're getting soft if you passed on an easy setup like that one.
I just choose not to abuse the elderly.....too much.



The very first schoolbook that was written had God all over it. --Dave Mustaine
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post #8 of 8 (permalink) Old 08-27-2015, 02:57 AM
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Make sure you clear the PAIR ports on the valve cover off their reed valves inside.
Due to the PAIR removal or deactivation mode, air stops to flow and the reed valves fill up with chunks of, coal like, depositions and that builds down the pipe that leads near the exhaust valves and gets really messy eventually.

Just a thought.....
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