Some 450 owners have complained about their bikes not starting with the e start, but they start right up with the kicker. I think I have the answer. Up until now I have used the e start for all starting, even in very cold weather. After rejetting (160 MJ, 48 PJ) it started pretty good in very cold weather, but I had been making sure the battery was charged well. Because I had a defective turn signal switch it took me quite a while to find the problem and my battery was running low. Using the e start it just wouldn’t start up, so I decided to give it a kick. VROOOMMM. Since the starting and lighting systems are independent of the ignition system it had to be something else. I believe the problem is that if the battery is a little low or the weather very cold or jetting if off quite a bit the E starter can’t get the RPM up high enough for the decompression to release so the fire doesn’t want to light it up. Give it a swift kick, you have gas, air, and spark as with the e start, but now you have compression since you reached the RPM level that kicks out the decompressing. Make any sense? After rejetting the bike ran much better, the snorkel was out , I was using an old style vortip which worked well on my 426, but there was still some rumbling and minor sputter down low. I hadn’t done the gray wire mod yet since on my 426 it didn’t seem to do anything. But I decided to do it and see if it made any difference. OMG, it is running so smooth now I can’t believe it. I rewired it so I could but a switch in and switch it back and forth to see how much difference it made. I didn’t get time to put the switch in line yet. I plan to put it in and test it further, and if disconnecting the gray wire it was what made change in my bikes performance, I’d suggest you do it if you haven’t done it yet.