RC51 No Start/ No Spark

[xrocket21]

Last summer, about 2 weeks before my shoulder surgery, the RC died on me. I rode it 100+ miles that day, and cruising along on flat ground going 40 in 4th, it simply shut off without a hiccup, backfire, light, flicker, anything.

-When you turn the key, the fuel pump cycles
-it has fuel
-no FI light
-battery is good
-fuel commander lights up and seems to be okay
-all fuses are good
-quick check of wires shows nothing chaffed
-pulled the plugs and layed them on the frame and see no spark

I have the manual, and Ill keep at it, but wanted to check if there is something obvious I might be missing?

[Paul_E_D]

power commander is suspect...

[xrocket21]

power commander is suspect...

It came installed when I bought the bike a decade ago, so Im not familiar with how it is installed. I think I can just take it out of series and jump around it? it is obviously the old non usb one.

[Paul_E_D]

You have exceeded my knowledge in this area. I've never put one on a bike, for this reason. I assume you just unplug and run tha stock map.

[xrocket21]

You have exceeded my knowledge in this area. I've never put one on a bike, for this reason. I assume you just unplug and run tha stock map.

then what makes you suspect the fuel commander?

It lights up normally when I power on :o

[Paul_E_D]

They are notorious for dropping fuel maps and generally being annoying. Though some people swear they are the bees knees.

[xrocket21]

its been solid for me since 06!!!

Ill look into it though

[xrocket21]

after not touching it for 8 months, I had some delusion of getting it running last night and riding it to work today

[SwiftTone]

I would just take the Power commander off to see. It's easy as it just involves unplugging 2 plugs from the harness and plugging the stock harness back together.

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[GearHd6]

power commander is suspect...

My dad had one go bad in a Harley, it did just what you described. He unplugged it and the bike fired up on the stock map.

[xrocket21]

I would just take the Power commander off to see. It's easy as it just involves unplugging 2 plugs from the harness and plugging the stock harness back together.

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Will try tonight!

[myzx6]

If you don't have spark then the power commander(which only controls fuel) isn't the problem, kick stand switch or kill switch would be a good place to start.

[jeantarrou]

If you don't have spark then the power commander(which only controls fuel) isn't the problem, kick stand switch or kill switch would be a good place to start.

+1

A bad CDI could also be the culprit, maybe a bad tipover sensor too.

[Aprilia Pilot]

bad crank position sensor ?

[Fitron]

Could be several things. Have you had a look over at Honda RC51 Forum : RC51 Motorcycle Forums ?
You probably pissed it off by lugging it at 40 in 4th gear!

[snowborder]

Have you checked the tip over sensor located in near the rear fender?

[xrocket21]

fuel pump wont cycle with a bad tip over sensor or kick stand switch, so both of those I believe to be fine.

There is the main plug for the fuel commander, and then theres a second smaller one I cant get to. Broke a bolt taking a radiator off and threw in the towel there.

[union]

I'll come take it


Its probably the PC. It should just unplug. The PC IIIrs have been known to get a bit flaky.

[xrocket21]

I'll come take it


Its probably the PC. It should just unplug. The PC IIIrs have been known to get a bit flaky.

I unpligged the main harness, but theres a smaller plug WAY DOWN INSIDE and I cant get to it.its like behind the coolant overflow tank.

I have a new t-stat so Ill just start ripping coolant shit out anyway.

Then I can fix the broken bolt too

[SwiftTone]

My plugs were easily accessible.

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[xrocket21]

well, I have the fairings off, the tank up, and the airbox removed and still cant get to it

[xrocket21]

ooo, promising news, it looks like the wire I am having trouble accessing is the "ignition wires for the pc3" shown in figure D here:

http://www.powercommander.com/downlo...eng114-311.pdf

ignition wires and Im having park problems.....

[Paul_E_D]

You're welcome in advance. lol

[xrocket21]

Got the PC tottaly unhooked.... still no spark

changed the t-stat while I was in there so I at least got SOMETHING done. On to the next thing I guess.

At least it is only gonna be 70 tomorrow.

[Paul_E_D]

Hahaa! I cursed myself! Sorry to hear. That sucks. Next up. Coils, cam position sensor, crank position sensor.