engine height

[RidgeRunner]

x3 on raising the motor. Fix the prop, service the lower, and check the latches on the outboard cowl. My Johnny started to rattle and it turned out to be the latches. Glued in a thin piece of rubber to keep the latch quiet. Lost the rubber and discovered that the silicone caulk served the same purpose. Found it while poking and prodding around back there while on plane, actually put my hand on it to keep my balance to lean over the back and the noise went away. Second best guess would be the exhaust can rattling around if the mechanic didn't put it all together correctly, maybe he forgot the rubber at the bottom of the exhaust where it goes into the lower.
I do not believe you will see many more RPM from motor height adjustment. Something else, maybe the prop, your rpm is off by over 1000.

[Joker2]

Well pulled the boat for the season today, upon inspection I found the cause of the rattle. A while ago I had a rattle and found out it was my trim rod rattling when I went over 2000 RPM's because the water was pushing up against it. I used 5200 all around where the trim rod goes through the bracket, rattle was gone, used it all summer, no rattle. Well the 5200 let go and the rod is loose again. I think when I raise the engine I won't have the water forcing up against the rod and therefore no rattle. By the way do I need that trim rod? it doesn't seem to do anything, even when I lower the engine all the way down it doesn't touch. Thanks

[reelapeelin]

Originally Posted by Joker2

Well pulled the boat for the season today, upon inspection I found the cause of the rattle. A while ago I had a rattle and found out it was my trim rod rattling when I went over 2000 RPM's because the water was pushing up against it. I used 5200 all around where the trim rod goes through the bracket, rattle was gone, used it all summer, no rattle. Well the 5200 let go and the rod is loose again. I think when I raise the engine I won't have the water forcing up against the rod and therefore no rattle. By the way do I need that trim rod? it doesn't seem to do anything, even when I lower the engine all the way down it doesn't touch. Thanks

I'm trying to picture a "trim rod"...

[Joker2]

At the botom of the engine bracket there are 6 holes ( two rows of three ) on approx. a 45 degree angle, there is a stainless rod ( about 5/8" Diameter ) going through one of the holes to the other side of bracket with snap rings on each end to hold it in.

[Joker2]

here is a diagram, it is number 52

http://www.boats.net/parts/search/BR...ION/parts.html

[randlemanboater]

I am no expert for sure, but I would think that piece would only be needed on a motor with no power tilt/trim. Unless on your particular boat it is possible to tilt the motor down so far it would hit the boat.

That being said, on my 1972 25hp Evinrude, there is a spring on the one end that keeps that bar nice and snug in its place. Maybe you could find a spring that would work for yours if you need it.