Timing a 450?

[iancp5]

Anyone know how to time a 450?

It's a 2006 and unfortunately I didn't note before stripping the engine. I have downloaded the 2005 engine overhaul manual but it isn't clear.

 

[iancp5]

Think I've worked out how to time it from a dealer in the UK and am waiting for GasGas UK to confirm as basing on the 2005 manual and some indelible marker marks found on cam gears.

Leaves an odd question though. There is no camshaft sensor so how does the Fi know which stroke to inject on?

 

[bergerhag]

injects on every revolution, probably, using the ignition pickup.

 

[iancp5]

injects on every revolution, probably, using the ignition pickup.

I'm coming to that conclusion. Is that normal on bikes? Doesn't it cause the fuel to mix poorly?

 

[Qui-gon]

Perhaps the electronics works it out? Maybe it starts up with both pulses then it would be easy to cut off one of the firing and injection pulses and see if the rpm drops. Once the electronics figures out which pulse dictates the squirt and the bang it can turn off every alternate one. Also there is a permanent live to the ecu so it would not need to figure it out on every start just when the battery had been disconnected. Weird though as that ecu family is used on other motorcycles and even some Fiat cars presumably with a cam sensor?