Re: Merc 100 what to watch for what to offer

[jpatti75]

As Callie30R mentioned, the Merc 100 and 110 are very different motors. First, figure out if you are actually dealing with – a Merc 100 or a 110. If it has a shift lever and original black paint, it is a 110. If the shifting is accomplished on the tiller handle and the motor is white (assuming someone didn’t paint it black at a later time), then it is an automatic transmission Merc 100 from the early 60s. Both motors have their merits, but the automatic transmission is a much different drive system and a bit more complicated to service when it comes to the water pump. I personally like the automatic transmission motors, but they do require special tools and patience to work on. If you are looking for a Merc project motor, you just need to decide how much of a challenge you’re up for. The 110 will be easier to service and is a solid motor, and a bit easier to get parts for since it was made for so many years (granted there were changes over the years). The Merc 110s of the 70s moved to different ignition systems, and sometimes those can be pricey to replace when compared with the traditional magnetos offered throughout the 60s. There are still parts for the 100s, just don’t expect to change a water pump impeller in 20 minutes with a couple basic wrenches and sockets.

As for price, condition, location, and personal desire are all factors — there is no set answer. If the price seems worthwhile to you for the condition, go for it. Expect you’re going to have to put some work into it no matter what. The 110 was produced in abundance, so it shouldn’t be too difficult to find one without paying a ton.

Here is a YouTube video of a Merc 100: https://youtu.be/paro9ETeNzQ

Here is a 110: https://youtu.be/3Eu5zysLaJg
Hope that helps.
JP