Undo gearbox bolts,take off trim tab,undo bolt in trim tab cavity,disconnect speedo tube,pull off gearbox. You will see pump housing,undo 4 bolts,pull off housing exposing impeller,there maybe a clip on top of impeller depending on model,pull off clip then impeller.yamaha didn't make outboards in 75
SOURCE: Yamaha outboard motor manual
You got it :
http://www.yamaha-motor.com/outboard/service/viewmanuals/outboard_manuals.aspx
here !
SOURCE: looking for location of impeller on a inboard
If it has a OMC or Volvo most are in the top of the outdrive. If your motor looks like a car engine it can be if the front just like a car. This website claims they have online access to repair manuals so I would look there first. Go to other websites and look for impellers with the brand of motor, like Volvo impellers, Mercruiser impellers and some of those sites have excellent parts diagrams.
SOURCE: Yamaha 115hp 2 stroke Outboard Boat Motor. Went
is it carbureted or fuel injected? are your warning horns working? if it iscarbureted then a few easy test can be done to find out. if its fuel injected then its a little harder but not impossible.(1) check compression. without the year model I'm giving you a average numbers. all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark. use a spark gap tester all cylinders should jump a half inch gap. if you have good compression and good spark fuel is the problem nine times out of ten. clean fuel lines replace primer bulb and replace all fuel filters. Yamaha has a gravity filter under the engine coul. take it to the lake if no improvement. clean carbs. same test to be and fuel system service used of fuel injected engines. if no improvement in engine preformance then you will have to take it to a dealer to test with computer.
SOURCE: CHANGE WATER PUMP IMPELLER FOR EVINRUDE OUTBOARD MOD# E28ESLETD
Crowley Marine Boat Parts & Diagrams have diagrams of all the components, and the catalog is easy to go through to pull them up, OEM and other brands, no cost for the images.
have you changed the impeller inside the lower unit.
There is copper pipe to redirect water up into the engine.
When you replaced the impeller make the copper pipe is insert onto the engine.
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