flapper and gearing - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 12 (permalink) Old 07-04-2014, 07:01 PM Thread Starter
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flapper and gearing

Forgive me if this has been discussed a million times, I admit, I did not search the topic.
My flapper is squeaky. I want to retain it. What do I oil to stop the squeak.

What is stock gearing?
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post #2 of 12 (permalink) Old 07-05-2014, 11:59 AM
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stock gearing is 16/40.
The flapper,I dont know. I would personally unplug the vacuum line above your ram air duct and plug it.
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post #3 of 12 (permalink) Old 07-05-2014, 03:13 PM Thread Starter
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Ok. Like I thought, I have stock gearing!! Yeah, that's what I wanted.

Now if I can only get a drawing of how the flapper works.
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post #4 of 12 (permalink) Old 07-05-2014, 03:27 PM
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what are you trying to understand with the flapper? it opens based on rpm
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post #5 of 12 (permalink) Old 07-05-2014, 06:04 PM Thread Starter
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The vacuum hose connects to under the gauge cluster. What is under there?
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post #6 of 12 (permalink) Old 07-05-2014, 08:03 PM
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Basically the flapper actuator has a hose that routes to the flapper actuator and on to a vacuum tank.
The vacuum tank is connected to a fitting on the front of the throttle body with a one-way check valve.

The engine applies a vacuum to the vacuum tank via the one-way check valve.
The flapper valve is controlled by the ECU and via the flapper solenoid, which applies the vacuum to the flapper actuator diaphragm on top at certain RPMs.
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post #7 of 12 (permalink) Old 07-05-2014, 11:34 PM Thread Starter
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I just lifted up the rubber booty and squirted some WD40 into that area. The Squeak is gone. OMG, I oiled every part of my throttle assembly before I realized it was the flapper.
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post #8 of 12 (permalink) Old 07-13-2014, 09:05 PM Thread Starter
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Another quick question.
With a stock chain and sprockets. How many links are needed for a chain?
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post #9 of 12 (permalink) Old 07-27-2014, 07:35 PM
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I tore apart my airbox and lubricated anything that moved before reading this. Been riding with the squeak all season. haha Thanks guys!
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post #10 of 12 (permalink) Old 07-27-2014, 08:02 PM Thread Starter
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That squeek is damn anoying.
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