Hello all, new to the board as of today. Loads of great info here. Hope to learn lots.<br />My question to the group is in regard to my 120HP force outboard. It is a mid to late 90's model (can't remember offhand)that is running great and always has. However, some of the comments regarding Force motors on this board have me a little spooked. I have owned this boat for about 6 years (bought it nearly new)and use it probably 100 hrs / season. We have fairly short open water seasons up here (May-Oct). It is on a 17' Campion Allante boat.<br />My question is: what maintenance items should be looked at on this motor and at what intervals. I am ashamed to say that I have never even changed the plugs. In fact, last fall a bushing went in the starter and that was the first time I had ever had the cover off. <br />Also, what is the max WOT RPM for this engine. When I got it there was no manuals. Right now it runs at 5500-5600rpm for a indicated speedo speed of about 45mph. I don't have a gps to check if it is accurate.<br />Thanks in advance<br />Slapshot
<br /><br />You need a Service Manual. It will answer most of your questions and a whole lot more.<br /><br />It is time to change the water pump impeller; you are cooling on borrowed time.<br /><br />Inspect your plugs. Note which cylinder each comes from and "read" the engine and mixture condition from them. You can change them if needed, but I prefer to merely clean and regap them unless there is significant erosion.<br /><br />Your performance. . .5600rpm at around 45mph sounds like a well set up engine with the right prop and running well.<br /><br />Good luck.