Join Date: Oct 2018
Location: Gabriola Island, BC, Canada
If it fires just after you take your finger off the button, that would indicate something is drawing too much power. As in volts.
On my 79 1100 Yamaha, I removed the headlight relay, as it was not working as planned. So the headlight comes on when the key is turned on. Yami fires right away, even without a headlight cut out switch. The starter is usually the biggest current draw, or it should be.
I may have more to say after it gets closer to freezing, about my 900 Trophy.