I replaced the fuel and broken choke lever on my 425 this afternoon, and it started and ran well. I let it idle in the driveway for a few minutes, and then I decided to ride it around the block. I went about 3/4 mile, and when I pulled up to a stop sign, it died. After repeated attempts to restart, I pulled it home. I pulled the plug, and I have no spark. I believe it will start tomorrow and run for a few minutes, and then quit again, because this is exactly what it did before I let it sit for 9 months. Any ideas or experience with this?

Artie