I need a new impeller for a 30 horsepower Yamaha 2 stroke, 2cylinder 1 carburetor. Don't know the year, no serial plate on engine, sounds shady I know, bought from a legitimate outboard shop s.e AK

SOURCE: 40hp 1987 yamaha outboard motor will run for 30-60

Sound like the fuel pump is not keeping up with the engine's demand. Check it out. Good luck. Hope this helps.

SOURCE: 30 hp yamaha outboard

ckeck where it is leaking then pull the carb off sounds like you need new gaskets

SOURCE: impeller replacing on 1999 merc. 25hp 2 stroke

Should not be that hard. Tape up the ends so you can hold it with out getting cut, (if its ragged or sharp from damage). should be one nut holding the impeller on. If its to tight to hold try air or electric Impact wrench. If its bad you can tap with a hammer to help in removing the old one. If it turned on the shaft you will need to rent a puller. Repost if you need more help.

SOURCE: i have a 50hp 2007 yamaha 2 stroke

Did you change your fuel? If you are trying to use the same fuel from last year without being stabilized then that would cause your problem. I know that you already had your carbs cleaned but it sounds like something els got plugged up in them. If you have fresh fuel then I would take the carbs back apart and check your jets in the carb to ensure that there is nothing obstructing any of the orifaces in the jets. I am a boat mechanic and I have had to take carbs apart 2-3 times sometimes if they were varnished really bad to make sure I got all of the gunk out.

SOURCE: i have 30 hp two stroke pull start yamaha outboard

yam water pumps are clever the offste centre causes the pump vanes to flex during rotation and at low RPM you have a displacement type pump, at high RPM water pressure forces the vanes to flex inwards and the pump becomes centrifugal, you can fit the impellar either way up so you cant fit it wrongly make sure your gaskets are ok and that the delivery pipe to the power haed is not leaking (try a hose on it) also make sure the little woodruff key or on some models the pin through the drive shaft which turns the pump is fitted ok, not much else that can be wrong!