today i was cruising around my 77 maxi with a polini on it. i have only been able to open it up for a few days now. today i was cruising around 42mph on the flats when i heard a loud screeching noise and the bike quickly stopped. checked the plug, normal chocolate color. cooled it down and it started again. my assumption is that a soft seize is caused by a lean mixture. but the plug looked fine. i haven't pulled the cylinder off yet, that's tomorrow project. does this sound like a soft seize. if it is what is still usable in there. and finally how do i prevent it from happening again. someone recently said it was a myth, true or not.