SP2 Troubleshooting - Spring Edition - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 28 (permalink) Old 04-07-2015, 12:11 PM Thread Starter
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Lightbulb SP2 Troubleshooting - Spring Edition

Asking for help from the forum today. You guys were very helpful last time, but I have a new issue. This RC is lucky that I love her so much . Anyway:

I'm hoping to do this step by step to avoid confusion and narrow things down. Thank you ahead of time. I will give estimates as accurate as I can.

I will give away free beer if we figure this out. (I'm serious, if you're local, I'm in Asheville, NC. C'mon by.)

2003 RC51. It's been my project for a year now. Almost had it figured out, right before a winter nap.

1) If I start the bike, it will fire right away and idle for ~10 seconds, then stall and die. All running lights and gauges will stay on. No FI light. No stored FI codes.
2) If I try to restart it, it turns over but never catches again.
3) If I ignore it for an hour or so and come back to it, it will fire right away and I'll get another 10 seconds of idle.
4) If I give it throttle when catch it in time while idling, it will stay revved as long as I hold it (I don't give it much, I can hover it around 2-2.5k)
5) Once the bike starts registering temp and I get it to 160-180F, I can sustain idle.
6) If I try to ride it, it runs rough, but not horrible (probably need to adjust a map)
7) If I turn it off, as long as it's still warm, I can crank it right back up.
8) After it cools and sits, it's back to step 1.

PC 3USB. New Plugs (heat range 9). New FPR from Honda, installed during my last troubleshooting.

Thoughts?

The adventurous don't live forever, but the cautious don't live at all...
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post #2 of 28 (permalink) Old 04-07-2015, 12:28 PM
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Have you tried adjusting the idle screw in to raise the idle speed?

2001 RC51 SP1 (modified)
2007 GSXR1000 K6
1994 CBR600 FR (very modified)
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post #3 of 28 (permalink) Old 04-07-2015, 12:30 PM
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Have you tried running the bike without the PC3 hooked up?

Are all the vent and fuel lines clear of debris and not kinked?

Whats your idle set at?
1250 +/- 50 is the OEM setting. Set at op temp.

Fresh fuel?

I'll be in Asheville over the weekend of the 24th for this, https://www.facebook.com/events/928606137164727/
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post #4 of 28 (permalink) Old 04-07-2015, 12:46 PM Thread Starter
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Bike without the PC3 is the same behavior at idle, although riding at op temp is worse. So if anything the PC3 seems to be operating ok. The PC3 doesn't affect idle though right? I thought I read that somewhere.

Idle (after I force it to warm up) is around 1350-1400.

Idle screw does nothing. Either direction. Hmmm. I have a TurnOne Carbon Airbox mod, wonder if something came loose.

Fuel was 'fresh' last winter, I added the proper additives for storage. Does 'bad' gas cause a number of things like that? (I don't mind wasting a tank if I have to though)

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post #5 of 28 (permalink) Old 04-07-2015, 01:09 PM Thread Starter
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Quote:
Originally Posted by James_03_rc View Post

I'll be in Asheville over the weekend of the 24th for this, https://www.facebook.com/events/928606137164727/
Oh man, see I'd love to get it running by then LOL.

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post #6 of 28 (permalink) Old 04-07-2015, 01:10 PM
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It all depends on the map if it effects the idle or not.

I have DHC open box and when setting the tank in place I have to be careful not to kink the supply (big) fuel line. I would double check everything around the air box just to be certain.

Bad gas can cause a number of issues. If left long enough it will gel, then harden, clogging everything. But with my experiences that takes longer than just a winter. And with additives this will take even longer. When you say last winter, do mean 2014/2015 or 2013/2014?

But the ethanol in most gas now days will pull moisture out of the air and we all know how well an engine will run on water. I've read that gas left to open air, after a month it will start to deteriorate. Our tanks are vented so consider them open.

If it was winter 2014/2015, I do not think old fuel is fully reasonable for this, but it is defiantly not helping.

I don't know if a clogged vent would cause this issue but try to run the bike with the gas cap open. If it runs right with it open I'd check the tank vent lines.

You didn't forget a shop rag sitting on the throttle bodies like I did, did you?
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post #7 of 28 (permalink) Old 04-07-2015, 01:24 PM Thread Starter
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HA! No shop rags hiding as far as I can see :-)

The gas is from winter 2014. Actually thinking about it though, it's probably around 6 months old. I'll dump it just to be sure.

I think I'll just take the whole tank off at this point. Go over everything around the airbox. I'll add pics if I get stuck.

I'm gonna trace the idle screw too since it does nothing. Very strange. Do those break easily? Or get 'over torqued'?

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post #8 of 28 (permalink) Old 04-07-2015, 01:24 PM
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Pull a plug and see what it looks like.

a couple things I can think of that would cause an issue like this.

Too much fuel (or not enough air for the amount of fuel)
Not enough fuel (or too much air for the amount of fuel)
Weak spark

I can run gas in an engine that is two years old, so I doubt the fuel is the issue. It may not rev to 10k, but it should at least stay running. I swear by the Lucas fuel treatment for all my engines. (truck, bike, snowblower, lawnmower, etc)
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post #9 of 28 (permalink) Old 04-07-2015, 01:36 PM Thread Starter
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Quote:
Originally Posted by MikeinCtown View Post
Pull a plug and see what it looks like.

a couple things I can think of that would cause an issue like this.

Too much fuel (or not enough air for the amount of fuel)
Not enough fuel (or too much air for the amount of fuel)
Weak spark

I can run gas in an engine that is two years old, so I doubt the fuel is the issue. It may not rev to 10k, but it should at least stay running. I swear by the Lucas fuel treatment for all my engines. (truck, bike, snowblower, lawnmower, etc)
Lucas is actually what I used, so maybe I'm good there.

Ok, so getting a list together:

1) Check hoses/ lines around airbox and fuel tank
2) Pull plugs and check condition
3) Check spark strength
4) See why idle screw does nothing? (or is this a 'symptom', not a 'cause')

Thanks so far guys.

The adventurous don't live forever, but the cautious don't live at all...
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post #10 of 28 (permalink) Old 04-07-2015, 01:41 PM
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I just went over your other threads and noticed that the flapper valve was removed on top of the snorkel, did the vacuum line for it get capped on the front of the front throttle body?

If we don't figure it out, I'll be getting to Asheville the night of 23rd (Thurs) and should be able to look at it on the 24th.
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