Cold start problem

[Mickire]

Lads,

Last week i got a bad misfire it was like that for a week and then i stripped it down and changed coils and leads, when it had the misfire it was a pig to start when cold
Now its running better than it ever did however still a nightmare to start when cold, it fires and then cuts out after a second or 2 and if i try again it starts but i must give it throttle to keep it going.
Once warmed up it starts first tip of the button, any ideas what it could be ?

Thanks
Mick

[Art]

That's what is known as a 'Crank, Start, Stall' fault.

Happens with my CBF 1000 A-6 from time to time and is most probably caused by condensation in the combustion chambers, especially this time of year. Try the flooded engine start up procedure as per page 62 of the Owners Manual:

1. Leave the engine stop switch set to (RUN).
2. Open throttle fully, this cuts off the fuel supply.
3. Press the start button for 5 seconds.
4. Press the starter button for 5 seconds with the throttle completely closed.
5. If the engine starts with unstable idle, open the throttle slightly. If the engine does not start, wait for 10 seconds, then follow steps 1-4 again.

That's how the Owners Manual describes it, I've had a quicker start up by repeating steps 2) and 3) three times with a 10 second pause in between before trying to start the engine normally with a completely closed throttle.

Other causes of 'Crank, Start, Stall' faults include a Battery or Ignition fault or a vacuum pipe leak but since the engine appears to eventually start I'd rule these out. If the engine light isn't coming on and there are no stored DTC's its unlikely to be a faulty (IACV, MAP or TP) sensor.

[Mickire]

Thanks Art,. Ill give this a try in the morning i think your right its probably the cold weather causing it, it does start eventually its probably a coincidence it started the same time as the misfire

Thanks again