Cold 1st start attempt issue

Fred, a thought - since you own a GS-911, try connecting it and seeing what the fuel pressure is just before the bike is started the first time, then compare the value to just before the bike is started the second time.

What I'm thinking is that maybe, the fuel pump doesn't prime the fuelling circuit when the ECU receives the 'Ignition On' signal - but only when the starter button is pressed.
This may explain why it only starts cleanly the second time the starter button is pressed - because that second time, there is now residual fuel pressure in the system.

...Let us know? :)

When I bought my K1200S in 2009, I was puzzled by the fact that the engine seemed to turn a few times before it caught - always.
Then I read a tech article that said that's a diagnostic feature built into that engine - it will always complete at least three revolutions before the ECU gives the okay for fuelling and ignition. It needs that time to check all engine-related sensors and actuators.

Well the bloody thing started this time however I did see the fuel pressure was around 2300 but then after it started it increased to around 5300 and stayed there. Killing the engine did not reduce the pressure but it was only for a short time.

The ignition was on quite a while before I started it and I was logging before with the GS911 however I couldn't find in the logs where it showed 2300 for the pressure. Perhaps it rose before I started it and didn't notice. I will start logging quicker next time.
 


Back
Top Bottom