20 Most Recent Clymer Marine Maintenance and Repair Manual '99 '02 Yamaha 115 250 HP 2 stroke Outboards - Page 3 Questions & Answers

Could be broken wire in loom,or bad connection in loom plug or faulty ign switch which is very unlikely

Bypass solenoid,put jumper from pos on batt to starter motor,but could be so many things,faulty battery cables,broken wire in loom,worn starter brushes,faulty solenoid ,start in gear switch or ignition switch

Sounds like accelerator butterflies are stuck,you probably need a good mechanic to sort this one out.try operate accelerator linkage on carburettors by hand but do not force, take off black air cleaner and spray penetrating oil onto butterfly shafts

Could be too much idling,4 strokes like a good run to get rid of fuel in oil,too much pitch on prop can also not allow motor to rev enough

Take out oil drain screw at bottom of gearbox and vent srew above cavitation plate,drain oil,squeeze in oil from bottom till it comes out vent hole,while still holding oil bottle in position screw in vent screw then screw in drain screw

Make sure carbs are clean,check exhaust tube isn't blocked,check resistance readings on charge coil,make sure filters are clean,no fuel leaks in fuel line,tank has open breather,fuel connector not blocked.if this doesn't solve the problem could be faulty cdi unit

Is the kill switch in,if so check for spark,is the choke working,why did u take cover of in the first place ?

The splined hub on the prop is not solid , there is a rubber or plastic sacrificial piece between the outer and inner portions of the hub. Designed to slip if you hit rocks or run over a rope so you dont ruin your drive or motor, just a prop.

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have you sorted it out yet as just curious as to what the fault was also this new web site leaves a lot to be desired for finding the latest questions as they come in

i have had this on mine and it was a sort of insect that made a mud nest in the small hole and it blocked the hole up ,try poking it out with a bit of wire

you will have to strip the bottom end and renew the water pump impeller ,not a easy job if the bolts have corroded up with the sea water ,soak then in engine oil for a day or so before you try

Every year or once every 50 hours. Use only fully synthetic gear oil. Fill from the bottom drain screw until oil comes out upper screw. Put in upper screw and then lower screw.

did it freeze? drain the oil from your lower unit and check for water. it would have to be 'VERY' cold for the gear oil to freeze but the water could crack the housing.

My outboard motor is old and used.When I went to run it for the first time everything worked except when I went to put it in forward gear the boat went slowly but when I gave it more gas the engine just reved up but the boat wasn't going any faster.The motor is 40hp gale model.I think because it is bought used the prop is not the right one and it seems like it's slipping as I go faster.
I would appreciate any feedback on this problem.

Thax, Don