fuel - starved cbr6?

[johno74]

My k reg cbr600 is fine except under heavy acceleration which causes it to misfire badly. A few seconds later it recovers.

Reason i think that its fuel is if you switch over to reserve it recovers. The problem doesnt occur if you throttle it in reserve.

Prefer not to just use it in reserve all the time because i tend to knock the tap into the off position with my knee. This doesnt happen in the on position due to the shape of the tap.

It has larger jets than normal to accomodate a naughty race pipe(on there when i got it). It is the older non-fuel pumped steelie framed cbr6

I've checked and cleaned the petrol tap and the tank breather is clear. The tank is nearly full of new petrol.

It has been jetted higher for the pipe, could these bigger jets be draining the bowls too fast?

Ring any bells with anyone?
cheers

[Dougie]

If it runs fine on reserve either the fuel filter or the passages in the fuel tap for main are mebbe needing a clean.Take it off,strip it down,give it a good cleanout and you should be okay.Should......:rolleyes:

[johno74]

I did that expecting to find crap in it but the tap was clean. Blew it threw anyway and the diaphragm was ok

??

[Dougie]

That's me out o' suggestions then.......:confused:

[TektroG]

You sure its really clean? By definition it must be something not common to both, and the only things I can think of are the filters on the tap, and tap itself.

[lowrider]

Problem i had with my bike was akin to this.
Stripped and cleaned the tap and the filters,fine for a few miles then fuel down to a trickle.
Another strip and clean but nothing wrong,same result,runs for a while then the problem was back.
In the end i simply replaced the tap with an after market one and had no more problems,never did find out what the rpoblem was so if you can i would do that.
Which don't help i suppose:D
Just thought it might save you keep on trying to solve the problem

[bird]

check the vacuum tube that operates the tap isn't leaking air - i had a vf400 that did this. used to cut out at high revs. the reserve position might not be vacuum operated.

[pyro]

check the vacuum tube that operates the tap isn't leaking air - i had a vf400 that did this. used to cut out at high revs. the reserve position might not be vacuum operated.

Spot on that man.