motorcycle technical problem, any ideas?

[mark_w]

as this forum is a font of knowledge, i thought i would bounce this problem off you guys, see if anyone has an idea.
a guy at work is having a bit of a problem with his bike. it is a 2002 GSXR600, fuel injected. he says there is an intermittant hesitancy/uneveness as he's holding a steady throttle at low revs/speeds/ like 30mph in a high gear. all the rest of the time it's fine - under power, ticking over or at motorway speeds. it was parked up in a heated garage whilst it was snowing, but apart from that gets used most days. this fault has occured since he started using it after the snow, rather than developed in use. so far i have told him to change the plugs [30000 miles on the originals], he did, and it's no different. the air filter was ok he said. i told him to look for damaged/kinked fuel hoses and to try some fuel injector cleaner you add to the petrol - but it's still doing it. he said the best way to describe it is that it feels like a carburated bike that is about to go on reserve - but it isn't predictable, and may happen all the time on a journey, or not at all. [bike all standard, no noisy pipe etc, has been serviced a few times].
tricky one eh? any ideas??

[Guyver1]

sounds like a remap is needed, these ECU controlled bikes need setting up every 12 months on the computer to get them running their best

[mark_w]

mmm...i don't know about that. some manufacturers [triumph spring to mind] have had issues with remapping, and new/upgraded versions of software, but i've never heard of anyone taking a standard japanese bike in for a routine remap. i've had half a dozen injected bikes, and i've not heard this before.
you aren't thinking of throttle body balancing are you? that can smooth things out, much the same way carb balancing did in't good old days.

[GARY3306]

Guyver doesn't mean a remap as in give it more power, he simply means getting it hooked up to the dealers diagnostics and all sensors reset/realigned. A bit like resetting to factory standards if you like. Brings all the sensors etc back into their parameters in relation to each other. Worth a shot at this first as it's often all that's needed for a fix

[mark_w]

oh, righto. yes, possibly, could be worth a shot, just hoping it was something he could fix in his garage before admitting defeat and taking it into a shop.

[Guyver1]

I know all too well about Triumph

shame their own dealers dont know anything about them

[Fruit'n'nut]

Sounds like it hasn't been serviced to Suzuki's spec, if the spark plugs haven't been changed several times by now (though of course they may have been fine, if they were checked) - they're supposed to be replaced every about every 7,500 miles on that model.

It should also have had the valve clearances checked at 15,000 miles/two years old. If that's out it'll be losing compression past the valves.

[mark_w]

it's had the valve clearances checked. it starts, ticks over, runs/revs fine, just sometimes holding a steady 30/40ish/high gear, it feels like it's about to go on reseve/conk out, but then it picks up again, may not do it again that day.

[Johnytuono]

as this forum is a font of knowledge, i thought i would bounce this problem off you guys, see if anyone has an idea.
a guy at work is having a bit of a problem with his bike. it is a 2002 GSXR600, fuel injected. he says there is an intermittant hesitancy/uneveness as he's holding a steady throttle at low revs/speeds/ like 30mph in a high gear. all the rest of the time it's fine - under power, ticking over or at motorway speeds. it was parked up in a heated garage whilst it was snowing, but apart from that gets used most days. this fault has occured since he started using it after the snow, rather than developed in use. so far i have told him to change the plugs [30000 miles on the originals], he did, and it's no different. the air filter was ok he said. i told him to look for damaged/kinked fuel hoses and to try some fuel injector cleaner you add to the petrol - but it's still doing it. he said the best way to describe it is that it feels like a carburated bike that is about to go on reserve - but it isn't predictable, and may happen all the time on a journey, or not at all. [bike all standard, no noisy pipe etc, has been serviced a few times].
tricky one eh? any ideas??

Hi
Had a very similar problem on a Ducati I owned....turned out to be an ignition coil pack.HTH
JohnyT

[keith1983]

I don't know if it's been mentioned before, but fuel filter? Throttle cable adjustment?