My bike has developed an annoying problem. It dies after about 10mins of riding. It drops out and will roll to a stop. I let it sit for a minute, kick start it and go another 10mins, then it stops again.
So far, ive put a new battery in (starts alot easier now).
Replaced the fuel filter (which was pretty blocked).
I thought the filter was the problem, but, no, its still cuts out.

Does this sound like a float related issue ? Id like to rule out all other posiblities before i pull the carbs.
Is it possible for both floats to move at the sametime ? I figure, if one has moved, it would still run on one cylnder that hadn't.

Any info would be appreciated
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Next time t happens, quickly open one of the float bowl drains, and see if there's fuel in ther - it should be a strong flow from a full carb. If not, you're looking at a fuel starvation problem. If there is fuel, then I'd be looking at an electrical issue, as things like coils can break down when they get hot.

Have a look at the connectors on the coils, to make sure they're not blackened or pitted...
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

have you checked the fuel tank breathers aren't blocked??

Adding to Dave's suggestion, I would suggest next time it happens you quickly shut off the fuel tap as by the time you've got off the bike and got a long screwdiver out, the fuel will most likely have filled the float chambers again!

It does sound like a classic case of starvation.
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Andy.
NSR-WORLD.COM

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Thanks guys. Ill try those ideas today.

The tank breathers are good. When i first put the tank on (it was from a wrecker) they were originally blocked. Its was cutting out pretty much like it is now, except it would take longer. When you would open the cap, you could hear the air rush in as soon the seal was cracked.

Cheers guys. Ill report back this arvo.
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Winning isn't everything, but loosing isn't anything

Andy wrote:Adding to Dave's suggestion, I would suggest next time it happens you quickly shut off the fuel tap as by the time you've got off the bike and got a long screwdiver out, the fuel will most likely have filled the float chambers again!

It does sound like a classic case of starvation.

Ah yes! Good point!
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

I have good news and bad.

Good news is - Its not fuel starvation.
Bad news - Its doing some funky sh*t.

So i get 3km down the road. Starts dieing likes its out of fuel. Shut the tap off, crack the bowls, fuel pisses out of the drains !!!.

But no dash. I left the key on. No neutral light, no sidestand light, no blinkers. Dead. Turn it off. Give it about 1 min, turn back on, and we have power again.

Go for ride. Stop at some lights. Pop neutral, NO LIGHT !!. No blinkers but the bike is running !!!! Take off then stop down the road. Still no dash lights. Give some big free revs, still no power. Turn off, wait, turn back on, and we have lights again.
Start it, rev it. Neutral light is pulsing at idle. Turn headlights on (i can turn mine all the way off) and it stalls. Interesting.
Start it, ride it home (about 4km) with out another glitch. Get home,all electrics are still working.
Bike performance is fine when running. Revs clean, no hesitation. Top end is good. Starts real easy.

So NSR gods, where should i start looking ? Could this be a combined reg/rec malfunction with a magneto problem ? Tomorrow ill inspect the ignition for anything obvious. Ill check coils as well while the fairings are off.
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when mine was like that the reg rec was on the way out , either that or the battery's not holding the charge from it. think nsr's generally need a good battery to run the RC VALVES and stuff.

Reg/rec.
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Andy.
NSR-WORLD.COM

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Time to get your multimeter out and test the battery.

1. Do it with the ignition off.

2. Do it with the ignition on.

3. Do it with the engine running at idle.

4. Do it with the engine running at a steady state over 4000 revs.

Come and tell us what you have!

Should be about:

1. 12v
2. 11.6v
3. 12v
4. 14.5 tops.
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

You'll normally get away with just a reg/rec too, if you catch it quickly. The NSR battery is usually quite resilient.
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Andy.
NSR-WORLD.COM

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Thanks guys.
The neighbours are gunna love the above 4000rpm testing LOL

Cheers for the info. Appreciate the help.
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Ok, finally got around to testing the bike

Ignition off - 11.63
Ignition on without headlights - 11.46
Ignition on with headlights - 10.6
At idle - 12.3
At 4000rpm - 12.6

Bike would not make anymore than 12.6 at any rpm from idle to 10k.

Reg also got quiet hot. As in, 3 secs max touch time.
So this is faulty reg/rec yes ?
Ive searched the forum for related issues,and it sounds like a reg to me.
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I'd say so, I've never seen a good reg/rec give anything other than 14.5v or maybe 0.3v either side of that.
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Hey all.
I orderd a new reg for the bike. Its the updated finned version that suits just about every honda made.

I fitted it. Bike was hard to start. It was sitting for about 3 weeks though. Got it started after a couple minutes however.
I got about 2 km up the road, and it drops onto 1 cylinder. I rode it home on one cylinder (thinking gee an NSR125 would be dull)
Check the exh. Both are putting out the same air, but only one is warm. Its the front cylinder thats out.
Pull the plug, its oily. Clean it, put back in. Start it. Still only 1 cly firing.
Tried an old plug, still no good.
Pulled the coil out, cleaned contacts, put back in, tested both plugs for spark, AND THEY BOTH SPARKED !! The spark was even jumping from the thread to the earth point (which was a fairing mount)

So i put it back in the bike, start it, and still only 1 cly !!!!!! Go for a ride and that cylinder cut in for a couple sec, then out again and stayed out.
Could this have anything to do with the new reg ? I didn't think the reg could effect each cylinder independantly. The rest of the running seems ok. It starts easy, and idles on 1 cly fairly comfortably.
Whats the next thing i should test ? Im going to try swapping the coils and see if the top cyl dies and the bottom one fires.
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Winning isn't everything, but loosing isn't anything