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On the lower side of the gearbox,below the line of the prop shaft,you will see a screw that is about10-15mm across.This is the drain for the g/box oil.If you look above that screw about 150mm(6 inches),you will see another screw the same.It may even be marked 'oil level'.Remove them both.
Checked the drained oil is not milky.It's a sign of water and the propshaft seal would need to be replaced.
The oil bottle you buy will have a tapered nozzle.You must fill the g/box from the LOWER hole by sqeezing the bottle.When it comes out of the UPPER hole,the g/box is filled.Quickly put the lower screw back in first,and then the upper screw.Done.
Before you refill the g/box,check the washer/seal on the screws and make sure they are still good. Hope this helps
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Look below lower mountings you will see the shift rod with along nut and a lock nut,undo long nut,do this with motor in reverse gear,some 40s have a stainless plate cover which you have to remove first
First, check the linkage under the motor cover. It stoops you from given the engine too much throttle when the motor is in neutral but can jam the system if you try to shift out of gear at too fast of speed. Or a link in that system could be broken/loose. If all looks OK the check your lower unit oil. If none or water, the gear case could be trash.
pull the spark plugs and see if they look like there burnning the same if so then i dought its a spark issue and if it was in the lower unit u wouldnt here a loud anything it sounds like a rod bearing i have had the same thing happen to several yamahas under a load
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