Bandit 600 - please help??

GSF Jamie 600 · Scooby Slapper Joined: 17 Oct 2008 Karma :

Hi

My bike is having some issues, the bike starts fine but misfires and runs on 3 cylinders Sad

Now this doesn't happen evertytime but occasionally.

It then ride like a bag of bones until about 15-20 miles later where it just picks itself up and runs sweet again Embarassed

So my question is what could be wrong with it, does in need the carbs cleaning, carbs balancing or could it be something else Confused

Its a 97 Bandit 600 with 9k on the clocks, it has had a recent oil change, new iridium spark plugs and a new air filter.

If anyone could shed some light on this or just some advice, it would be greatly appreciated Karma

Many thanks
Jamie Thumbs Up

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

When are you using the choke?
3-pots on start up, does sound like carbs could do with some attension, but rough running till warm, is a warm up problem and teh starting point for that is whether you are knocking teh choke on for start up and then off too early or something.
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GSF Jamie 600 · Scooby Slapper Joined: 17 Oct 2008 Karma :

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Not certainly the carbs, no. Could also be a ignition related such as plug, HT cap or plug lead (most other things would affect 2 cylinders). Also it could be valve clearances.

My first guess would be the plugs. If you are unsure then swap the plug between the cylinder than is playing up and one of the others and see if a different cylinder misbehaves.

All the best

Keith
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GSF Jamie 600 · Scooby Slapper Joined: 17 Oct 2008 Karma :

Thanks for the reply,
The spark plugs were brand new just the other week, and i had them out the other day to clean them up, but they weren't even dirty.
The issue was present before i bought the new plugs as i thought this may remedy it Confused

Oh bugger i hope its not valve clearances as i've heard thats a pricey job Crying or Very sad

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

doggone · World Chat Champion Joined: 20 May 2004 Karma :

Maybe an ignition coil is on the way out, they sometimes do odd things like run OK for a while then fire intermittently.
There will be two, each does two cylinders.

evoboy · World Chat Champion Joined: 20 Aug 2009 Karma :

GSF Jamie 600 · Scooby Slapper Joined: 17 Oct 2008 Karma :

doggone · World Chat Champion Joined: 20 May 2004 Karma :

I wouldn't rule it out - You could swap them over to test.