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05-20-2021 08:37 PM
twofishy4u Same noise.

05-20-2021 08:33 PM
twofishy4u ^^^^ interesting!!! Hearing with a stethoscope I was pretty sure the noise is in the engine, specifically in the head area....but that being said noises travel a lot! I will try to drop the lower unit sooner than later and do this. I'll get a water pump kit at that time also. These shims are under the pump and on top of the lower unit I suspect?
05-19-2021 08:07 AM
GUEST159753 noise is more than likely coming from the lower unit. upper drive shaft bearing needs a shim or 2 removed. drop the lower unit and run the engine without it on for a few seconds and i bet the noise is gone. when lower unit is off removed the water pump and tear down and remove one of the shims from the upper bearing, more than likely there are 3 of them, and reassemble. this will take care of the noise.
05-19-2021 03:55 AM
Red Rock As a life long on/off mechanic, tracing noise is challenge. I have a much older 9.9 (Bondesee) that runs amazing. Curious, where the PCV valve and crankcase breather are located and if its possible that they are contributing to your noise? Also with water hooked up and cowl off, you can get a mechanic stethoscope (very cheap) and isolate the area of the noise. Hit the noise (while running) with a quick shot of wd-40 and listen for changes. A problem is just something looking for a solution. Keep digging you'll get it!

On the Stethoscope, pull that sound chamber of the hose and just listen with the open hose, its very helpful
05-17-2021 08:40 PM
twofishy4u nope. Made in Japan. Everything under 75hp is made elsewhere.
05-17-2021 06:21 AM
jeffbilodeau I believe Pro Kickers are built in Fon Du Lac. All other small Mercs built by Tohatsu.....unless something has changed lately.
05-16-2021 07:04 PM
twofishy4u yep carb is drilled. Runs much better with that screw out 1.5 turns. 10w-30 it is. Runs fine just not quiet. Now the 115 (yammi based) is super quiet. Almost comical how much quieter the 115 is than the 9.9. I wonder how much $$$ merc saved by using these tohatsu's vs. any other japaneese built kicker that was descent
05-16-2021 06:28 PM
MuskieMat They are definitely not quite motors 10-30 synthetic and run it. Drill the plug and adjust the mixture screw if needed. Mine runs light years better after an adjustment.
05-15-2021 04:45 PM
twofishy4u used it again today and it does run a lot better. Good enough for me at this point.
05-12-2021 08:24 PM
twofishy4u yes I have ran it all different ways. Unfortunately I have been an auto tech for well over 20 years. I have enough knowledge to know it isn't the intake or lower unit or the timing belt. It's inside. It's internal. Last night I read over an hours worth of Tohatsu owerns crying about the same noise. Even a dealer had a Tohatsu engineer come out and swap parts only to hang a new one on the customers boat....same type of noise but was a little quieter than the other. It's common. I'm going to run it this year and see what happens. Does run smoother with the carb rebuild so the whine is at least constant.
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