Struggling with my RC.. - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 20 (permalink) Old 07-09-2013, 09:52 PM Thread Starter
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Struggling with my RC..

Everytime I take her for a spin it struggles to stay at a constant RPM. For example; when I get on the freeway and try to stay at a steady speed it lurches on me and the RPMs jump around. I recently purchased a power commander as well but I did not get the disc for it, can I find the maps and stuff I need online? Also, I know nothing about fuel injection cause this is my first fuely bike and I am not very tech savvy. Any help fellas? Thanks..
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post #2 of 20 (permalink) Old 07-09-2013, 09:55 PM
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Tell us more about your bike....post some pictures too. What kind of exhaust are you running?

Did it do this before the PC was installed?



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post #3 of 20 (permalink) Old 07-10-2013, 06:49 AM Thread Starter
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Stock everything. Yes it was doing this studdering thing before the I put the PC in. I was hoping the PC would help smooth it out but it didn't change anything so I'm not sure if I did it right.
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post #4 of 20 (permalink) Old 07-10-2013, 07:35 AM
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What RPMs are you trying to stay at? mine does the same thing at low RPMs. (also new to fuel injection) I have already found out that while it sounds great and can cruise at 3k under slight load without problem, at 5k, it rides a lot nicer.
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post #5 of 20 (permalink) Old 07-10-2013, 05:49 PM
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Pulled the plugs to inspect them yet?

'06 Black/Metallic Gray RC51
-Competition Werkes FE w/
Clear Alternatives IT

'02 Silver/Black CBR 954RR
'11 Graphite Black CBR 1000RR (sold '15)
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post #6 of 20 (permalink) Old 07-10-2013, 06:34 PM
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Most PC's do little right out of the box until you download a map.
Go here
http://www.powercommander.com/powercommander/

Download the program and download the map that fits your bike.

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post #7 of 20 (permalink) Old 07-10-2013, 11:16 PM
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As mentioned by f3racer, out of the box, the power commander unit is at a "zero setting" with no changes being made to alter air/fuel ratios.
The act of altering the base setting via importing a saved map or creating a custom map via a series of dyno runs is what alters your fuel metering.

These bikes generally don't care much for putting below 3500 RPM, and especially below 3000 RPM (Harleys they ain't).
At low RPMs and in lower gears (3rd or below), they can easily get into very jerky or lurching motion through a combination of flywheel inertia and multiplication of force by the lower gearing selection.
When that occurs, I usually just grab the clutch lever, disengage the engine, and let it settle down.
Above 4000 PRM, no problems with mine in any gear.

Now if it's misbehaving while traveling down the freeway, and it has an aftermarket exhaust, the exhaust may be causing a lean condition at certain RPM ranges.
When I first bought mine, it had a Jardine 2 to 1 exhaust installed, and beginning at 5600 RPM, it began getting really lean to the point of misfiring.
A simple dyno run to remap the power commander and everything was just dandy.
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post #8 of 20 (permalink) Old 07-12-2013, 07:28 PM Thread Starter
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Sometimes it backfires when I coast like up to a stop sign and no matter what rpm's I am running it still lurches like that. I was told recently by another RC owner that I am missing the piece that plugs into the "dash" right below the indicator lights. It has something to do with the vent between the headlights?
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post #9 of 20 (permalink) Old 07-12-2013, 07:39 PM
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Quote:
Originally Posted by Fealy48 View Post
Sometimes it backfires when I coast like up to a stop sign and no matter what rpm's I am running it still lurches like that. I was told recently by another RC owner that I am missing the piece that plugs into the "dash" right below the indicator lights. It has something to do with the vent between the headlights?
The flapper valve?

2001 rc51 upgraded

1999 vtr 1000 "superhawk" sold

2006 650R Ninja sold
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post #10 of 20 (permalink) Old 07-12-2013, 07:42 PM
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ID:	21794 Are you missing this aftermarket plug??


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