I’m guessing around $700, but start higher. With Craig’s list there is little risk in overpricing it. You can log on and change your price at any time for no charge. There are buyers 100 miles away so do your ad right if you want the motor to get top dollar. To get them to travel that far they must believe the goods are exactly what they want. So take good photos. Get it out into the daylight with an uncluttered background like a closed garage door. Use the auto exposure and focus to get sharp photos and fill the frame on each photo. Craigs let you insert 4 photos for no charge so why not show 4. Do a good job of describing your motor, make, model, year, condition, short or long shaft, electric or rope start. List any extras like a spare prop, fuel tank, owners manual etc. I always like to include a short explaination why I am selling. You do that and your ad will be better than 90% of the other ads you are competing against.