The darnest thing. My Nsr250 runs only when high beam button is on. When I switched back to low, she dies. Any word of wisdom?

Now that is wierd. Has it always done this? have you had it long? Does low beam and high beam actually work? Does it run if the lights are off?

It may be a short circuit in the low beam wiring, or a duff battery and blown high beam filament.

Will it run if you disconnect the bulb connectors? What about with only one disconnected?
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Run it on high all the time ?
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Charles Gallant

I tried pulling out one bulb and it dies out. As for running on highbeam...hahahha thats what i'm doing. I still would like to know the problem thou. This only occurs during idle. High and low beams work. even the parking lights work. The Passing button work too. It runs idle great when they are off but not in CA. I checked the voltage with a meter at idle and at 7k. The voltage goes up, so my stator works fine. I have to try and check it when at idle in low and high to see how different they are. You firgure when the low beam is on the voltage would be higher and when high is on, the voltage would drop and it will die? My problem is backwards? Hmmm

My Mistake. When I turn off all the lights, the bike dies but instanctly. It would idle for a 5-10secs only.

What model is it?
Have you printed out a wiring diagram & traced it through against your bikes wiring?

Sounds like you have a wiring mod there, which uses the feed for the lights to power the bike. Wierd. Look for any areas of the loom where it has been tampered with.
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

I'm wondering if somebody played with the wiring to pass a DOT inspection. By law, headlight must be on whenever the motor is running (or something like that).
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james
Its not how fast you go...Its how you go fast.
MC21 Rothmans
RS250
RC31
CRF250X
748R
Porsche (many)
http://members.rennlist.com/j911brick/rennlist3_002.htm

The only thing I see is looks like the key switched was removed for track use. And there is the HRC box wiring between the harness and the PGM. Hmmm I wonder if I could put a jumper before the bulb on the high beam and just not use it and see if that will work too.

Jesus, why don't people with problems ever give you the whole picture?

Might I suggest that the removal of the ignition switch necessitated the use of an alternative method for powering the bike?

Duh.

It's a bit obvious that the loom has been tampered with, and the previous user had it wired so the headlight switch worked as an ignition kill. If it was on the track the headlights would have been removed anyway.

Buy a new ignition switch and refit it to the bike as per the standard wiring diagram and I suspect your problem may go away...
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

The switch is back on when i bought the bike. Kill switch works fine. The problem is still there.

Ignition switch as in the key? I will try it with another with another nsr.

We are talking MC21 aren't we? Not the smart card version?

Have you printed a copy of the wiring diagram? Have you a multimeter?
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Wire Orange/Blue from the pgm to the HRC box has tape on it. Its been stripped to expose wire. Am I suppose to ground that out from the bike? Either someone trying to mess up the bike or Its suppose to be like that. I don't have the wiring diagram or instruction for hrc box. from the bike the Orange/blue cable is attach to the Green wire with a short piece of orange/blue wire attach to nothing. It's a MC21

THE HRC box you speak of (part #30490-NKD-840) is to further advance the timing, it's supposed to be used with the HRC loom and has to be spliced into the normal '21 road loom, Monkey's is done and works fine, I've never seen any documentation on how it should be done, I'd work out how it was before and take it out for now at least.

And be very careful randomly grounding wires out and guessing connections, PGMs do melt quite easily.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread