I had a shade tree mechanic rebuild the top end and replace the shift tube on my son’s 07 420 and it ran for about 30 mins and now it won’t start. We picked the bike up and my son was riding around the neighborhod taking it easy( as the mechanic suggested) for the break in period. He said the bike just shutdown, and a helpful neighbor happened to pass by and towed him home. We played around with it a few days(changed the gas, put a new spark plug, pulled the fuel injector to make sure it wasn’t clogged), but it still won’t start. It back fired a few times but it just won’t start. I got a service manual and have run thru the trouble shooting steps for the pcm, bank angle sensor, and stop switch but that all checks out. The shift indicator is just a blinking dash so I’m thinking the angle sensor is bad and needs to be replaced or cleaned which i will work on asap. If anyone has any experience with this or any ideas i would appreciate the help hunting season starts next weekend.