I have a 66cc China doll engine with about 2gal of gas run through it (16/1 ratio) Its a mix of .6 gal of 87octane and 1.4 gal on 91. At some throttle levels i have had a loud "popcorn" sound. It doesent seem like its loosing power but its pretty loud and vibrates a lot. Is this reason for concern? If so how can i fix it?
Thanks, Harry
Thanks, Harry