Slow starting stumble - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 22 (permalink) Old 08-28-2011, 02:41 AM Thread Starter
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Slow starting stumble

Curious my new bike runs great but was wondering what makes a bike bang boom start fast with the first press of the starter switch as opposed to a slower weaker start? I know a fully charged battery can make a big difference and in fact i bought one but the starting on my bike is not a bang but more of a weaker start. Its got 8K on the clock and a new battery as mentioned. I have never used the choke (will try that tomorrow to see if that helps). It has Sato low mounts and a PCIII with what I presume is the correct map (how to verify?).

Since I only have had this bike for just over a week I would like to get your inputs here on how you start the bike (Choke etc) and if it bangs to a start or are they all a little slow??? My idle is 1300 or so when warm. I live in AX and its been HOT here (the reason I have not even bothered with using a choke).

I LOVE this bike!!!!
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post #2 of 22 (permalink) Old 08-28-2011, 06:29 AM
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Mine needs the choke all the time
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post #3 of 22 (permalink) Old 08-28-2011, 09:27 AM
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Weather under 80 degrees, I need the choke, just for about 15 seconds or so before the idle gets to high, I usually need to ease it in over the next 15 to 30 seconds.
If I forget to choke; it starts, then just to low of idle and it dies right away. So I pull out the choke and turn the ignition, then bam, I get that snap start you mention. Sounds pretty impressive. But I never get that on the first start. Choke or not.
It always misses the first fire stroke and catches the second one to start. It is consistant about that.

John, 2000 RC51 #000100

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post #4 of 22 (permalink) Old 08-28-2011, 11:06 AM
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I stop using the chock after I replaced the battery, fuel filter and fuel pressure regulator. It fires everytime on the first time a single burp of the throttle and it idles fine and smooth until I'm ready to ride
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post #5 of 22 (permalink) Old 08-28-2011, 04:53 PM Thread Starter
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I just tried it with the choke first on a cold start Bam....it fired up. Looks like that's the procedure for a "cold" engine no matter what the ambient temp is at.

Kpowe what made you replace the fuel regulator? What symptoms did you have prior (i.e. was it all starting related??)?
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post #6 of 22 (permalink) Old 08-28-2011, 08:54 PM
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The RC51 has no choke.....that is actually a fast idle knob.
Its best to always pull the fast idle knob out when starting no matter what the temperature.
When i start my RC51 i always have it pulled all the way out, as soon as it starts i push it right back in and let the bike get up to temp before riding.

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post #7 of 22 (permalink) Old 08-29-2011, 01:02 AM Thread Starter
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GTS that's interesting I thought it was a choke. So it does not enrich the mix but increases throttle position?

2004 RC51 Nicky Hayden, PCMIII, Sato-Low Mount
1994 FZR600, KTMSXC625 Thumper, Honda Metro, 150cc Puma
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post #8 of 22 (permalink) Old 08-29-2011, 01:50 PM
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Yep, it just bumps up the revs for starts....its just like holding the throttle slightly open, just its hands free.
It was put there by Honda specifically for starting the bike.

2001 Honda RC51 SP1
1996 Honda CBR 900RR
2003 Aprilia RSV Mille R
1999 Aprilia RS50
2012 Triumph Daytona 675R (Sold)
2010 BMW S1000RR (Sold)
2005 Yamaha R6 (Sold)
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post #9 of 22 (permalink) Old 08-29-2011, 04:00 PM
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When cold I, pull out the fast idle and then gradually push it in as the revs increase as it warms up.
By the time the engine almost at operating temp, the fast idle is all the way in.
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post #10 of 22 (permalink) Old 08-29-2011, 10:39 PM
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Technically it is a choke. Honda calls it that.

Section 3-5
CHOKE OPERATION
This model uses a bypass air volume control choke system controlled by the starter valve.
The starter valve opens the bypass air circuit via a cable when the choke knob on the left side of the frame is pulled out.

I have no idea what that means

John, 2000 RC51 #000100

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