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Old 02-24-2008, 02:01 PM   #1
dReWpY
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Default RC 51 info "free mods"

This is for all rvt lovers out there, enjoy


starting off the "free mods"
first off: do the flapper mod, it will make a world of difference

By disconnecting the vacuum line to the flapper valve in the air intake duct you can completely eliminate the hiccup at 6800 rpm & reduce the power dip we have all seen on the dyno runs between 5000 & 7000 rpm.

As the flapper valve is an air intake noise control device which is not used on the basic racer, but rather only on the street legal bikes where noise levels are monitored by the EPA. It is advised that you only do this mod to "race only" bikes.

Having gotten the legal disclaimer out of the way let's get back to the flapper valves function. The valve is partially responsible for the power dip between 5000/7000 RPM. The flap is normally open. If you disconnect the vacuum line it will always stay open. You can remove the flap if you like. although it shouldn't make much difference with the stock air box. The HRC and Moriwaki air boxes have a larger duct with no flap for the race motors. The flap closes at about 5500 rpm which reduces the intake duct about 65%. It opens back up about 6700 rpm. This is done to reduce intake noise on the road bikes. The mod is done by simply disconnecting the hose at the diaphragm switch & plugging the hose with a screw,bolt or whatever you find handy or aesthetically pleasing.




next "soft rev mod"

http://rc51.org/b2a15.htm


and the PAIR removal
http://rc51.org/pair.htm
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Old 02-26-2008, 07:48 PM   #2
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which one makes your MPG go to shit!?
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Old 02-26-2008, 07:50 PM   #3
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the one where you ride it like supposed to.... if i babied it the mpg wouldnt be nearly what it is, but the smile-per-mile would drop, and thats just not acceptable

the pc3 will actually drop it more.. but the hp will go up, along with the smoothness
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Old 02-26-2008, 07:56 PM   #4
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the one where you ride it like supposed to.... if i babied it the mpg wouldnt be nearly what it is, but the smile-per-mile would drop, and thats just not acceptable

the pc3 will actually drop it more.. but the hp will go up, along with the smoothness
Really... that's all that matters

Last edited by Mr Lefty; 02-28-2008 at 12:58 AM.. Reason: the smilie's work'n
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Old 02-26-2008, 09:45 PM   #5
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Really... that's all that matters

what no cheers smilie?!
im working on it, im seeing ppl using smilies that i havent gotten too yet
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Old 02-26-2008, 09:50 PM   #6
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im working on it, im seeing ppl using smilies that i havent gotten too yet
it's cool... just suprised.... not a huge thing
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Old 02-29-2008, 03:31 PM   #7
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which one makes your MPG go to shit!?
me thinks it's the big bore honda V-twin mod...
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If I have to get help to get it back up, I dont need to be riding it.

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Old 02-29-2008, 05:04 PM   #8
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me thinks it's the big bore honda V-twin mod...
I'm hearing the MPG's on the big Buell aren't so great either.
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Old 02-29-2008, 08:54 PM   #9
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What can you say... High performance, liquid cooled v-twins are some thirsty mutha's!
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Old 03-01-2008, 04:45 AM   #10
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I'm hearing the MPG's on the big Buell aren't so great either.
from what i've heard... mid to high 30's...

we shall see...

If i can average about 38, i'll be happy...

gettin 43ish on the SV... and a lot more smiles i'm sure on the 1125... so, it equals out


anything is better than my pickup at 15... even drewps RC!!!
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