Please help - reg/rect problem?

[Raffles_Gentleman Thug]

well my gsx-r600k1 is cutting out at about 7000rpm, the rev needle drops too, ive unwired the heated grips, its not got diesel in, ive cleaned all the relays and connectors - whats the problem? one of the lads at work reckoned its the reg/rec - any ideas?
____________________
"Is sir addressing me or is he masticating on a house brick? Because either way sir loses his teeth."

[Bezzer]

Don't think it's your reg/rec, if it failed the battery would just flatten and everything would die, wouldn't send it haywire as you're going along then let you start up again.
It only charges the battery if you want to see if it's working properly and show your mate up put a multimeter across the battery terminals start the bike and watch the volts rise with the revs, should get to around 14.5 ish volts at around 5,000rpm.
Problem could be fuel or electrical related, if there's a bit of a blocked breather that would affect the fuel supply when you got to your higher revs causing it to die, you could check that by running with the fuel cap open up to 7,000 to see what happens also check the fuel filter. Electrical could be anything from an ECU fault to a coil/plugs breaking down under load.
____________________
I used to be indecisive but now I'm not quite so sure.

[Raffles_Gentleman Thug]

it'll rev in neutral right up to the redline and it won't cut out very often, but in gear often it'll bounce from about 7000rpm down to about 4000 and keep flicking, and it's deffo not just the dial cos the engine note goes too.

Don't see how it could be a breather problem, I've opened fuel cap and checked to see if its full, and the weird thing is if i keep riding at below 7000 or so it works absolutely fine, the problem is if i go over it.

really pissing me off cos i just got the sprockets and chain replaced, and it was only just off the road with a puncture before that! Aargh!

THanks to anyone who can help!
____________________
"Is sir addressing me or is he masticating on a house brick? Because either way sir loses his teeth."

[sickpup]

Bit hard to guess as I don't know what you've done to the bike but I would start with the obvious things.

Change the spark plugs and the fuel filter, either could cause your symptoms.

Check the fuel pump, probably a garage job as if I remember rightly your bike is FI so the pressure needs testing.

Does the problem appear only when the bikes hot or cold?

It could be the reg/rec but I doubt it. When one goes you get these symptoms closely followed by the a total inability to rev as the battery voltage drops.

Are you getting any fault lights coming on when the problem happens?

[Bezzer]

It's under load you get the fault proper which is why I mentioned the breather, if it is partially blocked then you get a vacuum in the tank and it cuts the fuel flow down, it might cope when you're revving the bollocks off it at a standstill but under load you want more fuel and it can't give it.
Looking in the tank to see if you have petrol is not checking the breather I meant leaving the tank cap open and going over 7,000rpm on the road, having the cap open prevents a vacuum forming, if it runs OK then the breather is the problem, if it's the same then move onto the fuel filter.

BTW run the tank down a bit before running with the cap open
____________________
I used to be indecisive but now I'm not quite so sure.

[Raffles_Gentleman Thug]

Cool, I'll try those suggestions. Where would the breather pipe be?

And contrary to what it may appear, i have half a clue about bikes, just so busy and wound up today!

Thanks to both of you
____________________
"Is sir addressing me or is he masticating on a house brick? Because either way sir loses his teeth."

[Kickstart]

Hi

Could be the breather, but to be honest doubt it. Whenever I have had that problem it has not caused problems at particular revs, nor caused the bike to cut out suddenly. More just feels like the bike is going onto reserve.

Cutting out suddenly suggests electrics to me, although with an injected engine that covers the fueling as well.

If it was the regulator / rectifier then it would stop it starting on the electrics starter long before if would cause running problems.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing