It's no secret I like the 5100s and 5105 Dolmars. As many as I've had on my bench, I've never experienced the bad coils I hear talk of. I got the latest 5105 going tonight. Compression is good, good fuel, good spark. She tuned right in and responds beautifully. 2800 at idle, revs as quick as these do to 13.5k. Slapped a bar and chain on and went to the test log. As soon, and I mean as soon as it touches wood it loses everything. I lift it out of the "cut" and it returns to a smooth idle. Over and over. I tried it from cold and got maybe a second of cutting. It tried to run backwards a little and died. Fired back up and same. The flywheel is tight and on key. I only have one other coil, it's a red PS460 one though and looks pretty crusty. I got nothing from that. So, fellow Dolmar honks, is this what a bad coil acts like? If so, anybody got a spare black coil?