Prolific Poster Award
Join Date: Sep 2004
Location: Coventry, CT, USA
If this problem just popped up after sitting that long, I'd say a chip reset is at least a fair bet. If pressed into an answer of which is more likely to fail, I'd say it was the chip. The 1.6m seems pretty reliable in general. Unless there is visible corrosion or the battery was hooked up backwards, I'd try a chip first.
Have you tied to swap the connectors on the injectors to be sure it isn't a faulty injector? Things are triggered here by the ECU closing a path to ground. Source voltage is applied at power up, then the ECU triggers ground path off and on. One item known to cause a lot of heartache is the chintzy ground point on the ECU. It is the tiny wire connected to one of the mounting bolts. Try cleaning that ground connection, or even just use a jumper from a clean spot on the ECU to the neg battery terminal as an easy test.
Electrical connections have a way of getting grungy while sitting, especially if there was maybe a little moisture at the connection when the bike was put away from a washing or a ride in the rain.
If you're in the continental US, I'll offer use of my spare ECU and a known good ST4 chip you could also try. Just foot the bill for postage. PM if interested. As I said, even the ST4 chip will get the bike to start and run. Not well, but it will prove your chip good or bad.
2001 900SSie (gone, but not forgotten)
2003 ST4s (The Truck)
1995 916 (Junk Yard Dog)