MK1 Bandit 1200 poor idle.

[Carvel]

Can't get the bandit to idle properly when it's hot. Throttle response off of idle is also poor. Past that it sings like a good'un. Aswell as that it pops and bangs on the overrun.

I've had the carbs off and all seems well, needles don't appear worn etc, set the idle mixture screws to 1 3/4 turns, checked all the rubbers.

Are there any common issues with these things as I'm struggling to sort it.
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2002 Aprilia RSV1000R, Cbr600Fs, Mk1 B12, Vfr400 NC30...

Matt B: I can deal with crushed nuts to beat Ollie.

[RhynoCZ]

What do your air filter and spark plugs look like?

Also, how fast is the idle?
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Carvel]

Filter is dirty but not too bad.

Forgot to mention the airbox is also wet, pretty sure it's not just petrol either, feels oily.

Plugs are new and don't look too bad, a little black.
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2002 Aprilia RSV1000R, Cbr600Fs, Mk1 B12, Vfr400 NC30...

Matt B: I can deal with crushed nuts to beat Ollie.

[RhynoCZ]

A bit greasy airbox is perfectly normal. All the engine breathers are directed there.

MK1 that'd be a 1996. It's an old engine, and there are possibly carbon deposits in the combustion chamber and all over the plugs = hence a bit black colour. My ZXR sounds like a turbo diesel at idle, but when I go flat out for a while and then back to the idle, it gets much better. The flat out riding cleans the engine.

No need to be speeding though, there are fuel cleaners, such as STP engine treatment (Sea Foam). You pour that into the tank, mix with petrol and ride the motorcycle, that'll get rid of the carbon deposits for you. I had a '88 GPz and with that cleaner/treatment the bike ran much better, almost like if it needed the additive.

Anyway, ä video or rather audio of the motorcycle idling would be helpful.

Check this, about the a bit black plugs:

https://www.mts1200.info/motorcycleinfo/resources/6795/assets/images/FAQs/electrics/check_spark_plug_condition.jpg
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[doggone]

Carb balance maybe?

[temeluchus]

It could be a sign you need new float needles or possibly a stuck choke. Either will cause it to be rather rich.

Have a look at the spark plugs and post pics. Best to stick a fresh air filter in at the same time, if only to rule it out.
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Some shite cruiser. Now with guns and FREEDOM!

[Ant132]

I used to periodically balance the carbs with one of the cheap tube kits with the ball inside the line, always resulted in a much better throttle response on my bandit. It had quite sensitive carbs i found, maybe it was just me, or the fact that it took me a while to realize that when i was turning the mixture screw, i was turning it half a turn (180) whilst thinking i had turned it a full turn (360), looking back, what a retard!
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1980 Suzuki TS50 ~ 1984 Honda CB400N ~ 1992 Triumph Trident ~ 1998 Suzuki Bandit 1200

[Vincent]

[N cee thirty]

are your tappets alternating properly?
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[Carvel]

Slow reply on this.

Had the plugs out, they don't look too bad.

https://i979.photobucket.com/albums/ae271/RxsOllie/IMG_1183_zps80dbe629.jpg~original

40,000 miles on it, no history on the clearances so I guess a carb balance and valve clearances are next.
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2002 Aprilia RSV1000R, Cbr600Fs, Mk1 B12, Vfr400 NC30...

Matt B: I can deal with crushed nuts to beat Ollie.