I have a good idea of what a pre mixture is... Two stroke fuel/oil mixture. As far as pedal pins? Maybe something close to distributor points? I have some knowledge of ic engines... Took two years of auto tech but no real small engine experience. I don't have too much time but might be able to make a day trip or have fedex ship it. Not sure what they charge or how easy it is? I'm in Boise, Idaho. Not terribly close to MA I'm afraid.