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There are many good motors that do not have shims.---Precision made so no shimming required !!

I doubt you can check backlash that way !!

The trouble shooting starts with a compression test.-----Post your actual values here.

?//----How can you check gear lash in neutral by turning the propshaft.---I need to know.

Bad float valve.----Or fuel pump diaphragm ruptured. ----A 3 cylinder or 2 cylinder motor?

Strap wrench.

There is no powerpack on this motor !

?----The top ring will only fit one way!!

Are you putting the correct plugs in ?

A lot of this could be solved if this site forced folks to include model # / year / pictures / history of motor before questions can be submitted.------Nothing like giving advice and having poster say.----" Already did that "

What you are hearing may be normal for a heavy prop , and running on a hose !-----No point in wasting good gear oil.

Take the prop off and test run in forward and reverse.

Good luck with your motor.

Fact ------When there is no water in the block , exhaust can come out the tell tale.----That is the way it is !

I understand that popularity of formula 1 went down when engines stopped screaming making lots of noise at 18,000 RPM.----Same with unlimited hydroplanes when they moved away from V-12 Merlin / Packard engines.----Turbines just are not the same.

Some will argue.-----It sounds normal to me.----Have a look on the parts books for Suzuki and Johnson to see what the clutch dog looks like.-----The pinion gear / forward / reverse are always meshed.----It is the clutch dog that moves between forward and reverse that has that 10 / 15 degree...

But you are supposed to shift quickly from neutral to avoid grinding the clutch dog on the spinning gears !!

Is this while running on a hose ?----If yes that it may well be the prop causing the clutch dog to make the noise.----Tested in the water ?

Even new oil smells. ---You are supposed to shift with a quick firm motion.---Easing it onto gear does the damage.

What motor ?------Not sure why it would matter !----What is your motor doing / not doing ?----Also indicates that many folks have issues understanding 12 volts / wires.