Poorly 1150 Poss Fuel Problems

[snoopy]

One day bike is fine but very low on petrol. Go into garage and fill. Next thing I know it starts easy enough but one cylinder occasionally misfires (don't know which one, or could be both) but it doesn't always happen.

It's been doing it every since. I've just filled back up and problem seems little better. I'm unable to replicate. It sometimes does it at idle and sometimes not. Other times I'm sitting at 80 and it farts and wont go any faster. Occasionally it does 110 no problem Especially seems to like doing it at 2.5k rpm in sixth gear (overdrive) but not always.

Sounds like a fuel problem but why would it be find one minute then problomatic the next?

Fuel filter changed some 500 miles ago

 

[Neil W]

When the filter was changed did you dislodge the throttle cables where they sit in the throttle bodies when the tank was replaced. If they are not fully home it will give similar characteristics.

 

[DavidHale]

If it's a twin-spark it's likely that one of the plug caps is breaking down. Easy to fix - just put a new one on, but they're around £60.

Other symptoms include: only just idles and feels like it's going to stall; backfiring; rev counter reads very high; lack of power at top-end of rev range; almost stalls when you roll off the throttle.

Happened to mine twice now, and according to St. Eptoe it's a common problem.

HTH

David

 

[Spout]

I had similar symptoms on my single spark 1150. Eventually traced to a faulty O2 sensor.
It first happened within a few miles of filling up at a very cheap filling station. Coincidence?

 

[snoopy]

Cheers for the thoughts. It's not the throttle cable, air filter or sync. I checked plugs yesterday and they are clean and dry (single spark).

Since I ran it with new fuel it's got better yesterday and the problem does not occur until the engine temp is near 4/5 bars. I'm thinking the fuel knackered the lambra sensor as well.

Any ideas how much they cost? Just so happens I've 15 minutes to write a strongly worded letter to head office.

Cheerss - Snoop.

 

[Steptoe]

I'm thinking the fuel knackered the lambra sensor as well.

.

Unplug the lamda sensor - Quite a few bikes out there without it plugged in , or fitted makes little difference to how the bike runs.