Need Help Fuel and spark but no start.

[Motogiro]

You may have a problem at the ECU. Carefully check the pins at the plug to the ECU.

 

[patty1104]

After a few months of waiting for Yamaha backordered part, I installed the new Crankshaft position sensor. Still no start, I only had about an hour to tinker with it so thats as far as I got. I should have taken a reading on the new sensor before installing. Either way still no start.

Any resolve on your issue mate? I'm going through the same thing with mine

 

[harpkatt]

Any resolve on your issue mate? I'm going through the same thing with mine

I wish I had more to report. It's below freezing here so not much riding to do. But I hope to get my brother to look at it with me sometime.

 

[robertaustin9177]

It could also be your nuteral safety switch or your kick stand switch I'm going thru the same problem

 

[patty1104]

Tested both of them with no issue found. Tried running on starting fluid and it ran fine. Found that the diaphragm in the fuel pressure regulator was stuck open, so it couldn't maintain fuel pressure besides a kick every now any then after a bunch of priming. part is in the ultrasonic cleaner currently to see if that frees it up, otherwise will have to replace.