Bandit driopping revs and dying

[LustyLew]

Hi,

I was riding on the M25 yesterday, everything was going fin until the bike dropped about 500rpm. Then a few hundred yards up the road the power began dropping further. No matter how much I opened the throttle it didn't stabilise. The only thing I noticed was that the sound from the exhaust got louder as the revs dropped.

The bike is a Suzuki Bandit (600cc) on a P plate. The can is not the original, it is a Viper exhaust, I cannot test how it behaves with a normal can, as I don't have one.

anyone have any rough ideas?

I'm thinking either fuel starvation, or flooding of the engine.

Cheers in advance!

Lewis
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[lilredmachine]

A carb model? If so, make sure that the mixture is set right and that the carb does not need rejetting (this probably should have been done when the pipe was changed).
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[LustyLew]

Would fitting a dyno jet kit help at all, or just make matters worse?
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[Guest]

How long since the can was changed? Was it jetted/adjusted to make up for it?

Any loose connections in the exhaust system - downpipes, collector box etc.?


If it's been on a while and running ok, then the bike suddenly glitched, it's got to be something basic - blocked fuel filter? petrol pipe trapped?

[bish777]

odd sounds like something is blocked? get the carbs out and give it a good clean.

Is the pipe legal? perhaps its running a bit lean and youve fried something? If its a legal pipe the jetting shouldnt be too far off, but probably could do with being a little richer-raising the needles one notch ought to do.

but it does sound like youve got crap somewheres-get the carbs off to clean and check all the lines. put it on normal and suck on the vacuum hose and make sure that the tap works fine on normal and reserve as well as prime.
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GSXR1100J

[bish777]

Change the plugs too whilst your at it.

As for the dynojet kit, id get it running first before spending that kind of money. It will run better but it ought to run fine on stock jets with a legal pipe after a little adjustment.
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GSXR1100J

[instigator]

Doubt it's the exhaust very much. I mean, I wouldn't think it would affect the bike JUST like that i.e it would probably have affected the bike on your first ride.

As said, try clean out the carbs and check the condition of your clutch cable.

[LustyLew]

Right, well I think I've solved it, if I have it set to 'on', it dies. If I have it set to 'res' it's fine.

So that makes it one of two things, error on my part ( ), or the fuel tap is dodgy. Next time I fill up I'll give it a try.
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[ZaphodBeeble]

Check/change the air filter. Check/change the plugs. The way it was dying sounds like a fuel issue. Was it cleanly missing on 1 or more cylinders or was it sort of burbling and missing irregularly?
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Current bike: VTR1000F Firestorm. Previous: Firestorm (written off) - XJ600 Divvy - NSR125 - DT125 and a load of offroaders.

[Kickstart]

Hi

Pipe is unlikely to cause the problem, unless it has caused it to run so lean it has suffered engine damage.

It does sound like fuel starvation. Not sure on your Bandit, but I presume it is a vacuum fuel tap. Does it have an "On", "Prime" and "Res" positions, or "On", "Off" and "Res". If it is the 2nd then I would guess that the reserve position is not a vacuum controlled position (prime is normally not vacuum operated, to allow fuel from the carbs to the tank without having the engine running). In which case check the vacuum pipe is in position and not holed, but after that you are probably looking at a failed diaphragm in the fuel tap.

All the best

Keith
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[LustyLew]

Hi guys,

thanks for all the replies. Much appreciated.

It looks like I've been a complete tit and just underestimated the fuel level in the tank so I was simply running out.

Still better that, than something nasty!
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