Lugging/Surging - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 14 (permalink) Old 05-26-2013, 01:41 PM Thread Starter
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Lugging/Surging

In town, at speeds from I'll say 30-50mph in 3rd & 4th gear, I experience that engine thing where it is like lugging then surging. It's hard to explain. I've been told that it's a common thing, but that a Power Commander is supposed to help with it? The thing is, my bike has a PC and it still does it. I've tried experimenting with gear selection, but I don't want to have to keep the revs high all the time to overcome it. Any thoughts or suggestions?

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post #2 of 14 (permalink) Old 05-26-2013, 01:48 PM
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Check your pc and make sure you have a proper map. Better yet have it dyno'd.

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post #3 of 14 (permalink) Old 05-26-2013, 03:04 PM
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That is way too tall a gear for those speeds, especially if you have stock gearing, +2 and -1 I'm usually barely clicking into 3rd when I'm reaching 45/50mph. The rc51 engine performs pretty poorly at anything under 4,000rpms.

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In town, at speeds from I'll say 30-50mph in 3rd & 4th gear, I experience that engine thing where it is like lugging then surging. It's hard to explain. I've been told that it's a common thing, but that a Power Commander is supposed to help with it? The thing is, my bike has a PC and it still does it. I've tried experimenting with gear selection, but I don't want to have to keep the revs high all the time to overcome it. Any thoughts or suggestions?
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post #4 of 14 (permalink) Old 05-26-2013, 06:06 PM Thread Starter
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Gotcha. Thanks for the replies.

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post #5 of 14 (permalink) Old 05-26-2013, 07:09 PM
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My RC51 has no problem maintaining 2500 rpm all day long. I'm often below 4k rpm just to keep a low profile. There is no normal issue with driving the RC51 engine below 4k rpm. Only PC maps, etc.

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post #6 of 14 (permalink) Old 05-26-2013, 08:06 PM
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Mine bucked like a bronco around town even with a PC. Then I went -1 +1 and got a custom map made non the dyno and now she is pretty smooth while sneaking around town.

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post #7 of 14 (permalink) Old 05-26-2013, 09:42 PM
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Originally Posted by RIRC51 View Post
The rc51 engine performs pretty poorly at anything under 4,000rpms.
I disagree, the engine performs fine above 2500rpm with the correct tune. No need to rev the piss out of your engine to operate at 25mph in town. The more rpms the shorter the lifespan of the engine.

Surging and lugging are generally created from lack of fuel. If after sending the map to your bike and you still get surge, open the pc table and increase the fuel % at 2000 and 2500 rpm at 2% and 5% throttle ranges by 1 and try it. Only increase by increments of 1 until you find the sweet spot. Unless the surging is very bad then increase by increments of 2. If it gets better your headed in the right direction. Just takes a little bit of time and trial and error to get it right.

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post #8 of 14 (permalink) Old 05-26-2013, 09:47 PM
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post #9 of 14 (permalink) Old 05-27-2013, 02:59 AM
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Get a custom map made. PC's don't work magic on their own, it is the tuner that does the actual work. That is the only way to get it to smooth out.




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post #10 of 14 (permalink) Old 05-27-2013, 05:06 AM
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Quote:
Originally Posted by Andrew View Post
I disagree, the engine performs fine above 2500rpm with the correct tune. No need to rev the piss out of your engine to operate at 25mph in town. The more rpms the shorter the lifespan of the engine.

Surging and lugging are generally created from lack of fuel. If after sending the map to your bike and you still get surge, open the pc table and increase the fuel % at 2000 and 2500 rpm at 2% and 5% throttle ranges by 1 and try it. Only increase by increments of 1 until you find the sweet spot. Unless the surging is very bad then increase by increments of 2. If it gets better your headed in the right direction. Just takes a little bit of time and trial and error to get it right.
I'll give that a shot, but aren't big twins by nature snatchy at low rpm's? And man, I do laugh a bit at the thought of cruising around on a rc51 at only 2,500rpms, wtf!?

To the OP, increasing the idle speed can also help.
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