Light Boating - Answered Questions & Fixed Issues

1978

Question edited for a lot more clarity. It is likely to be fuel starvation. Check the following; The tank vent. The pump bulb is the right way around, ARROW towards Engine. Cut a section of pipe and see if the inner lining has delaminated. The grey fuel pipe is bad for this. Modern Ethanol fuels damage the lining. Black Tube is best. Also I had a similar issue on an Evinrude and it was a linkage not connected to the carbs. Only one was actuating. Check grounds and bad connections as David says.

Did you run the engine any since you had it serviced? If not, that is the issue. The carbs will stop up from just sitting! Take it back to where you get it serviced and complain like hell... DO NOT USE STARTING FLUID IN THIS UNIT!!!!

you could try a lower pitched prop.2" would up the revs by 400 revs.,which would up the revs ,but give you more low down thrust,and/or tucking the motor under more[if you have electric trim/tilt].thats a big boat and fair bit of weight for a 40hp..my 40hp merc is on a 13ft saracen,and with two of us it takes a while to get gooing.so i bought a ProPulse prop,with adjustable pitch.been god to try different pitches

not enough information on the motor. what year and model? but all yamaha outboards are shut down by the C.D.I. being grounded by the key switch or the emergency kill switch. the cheapest thing to test or replace is the key switch and the emergency kill. with more info on engine I can help you further.

It is generally difficult to find replacement parts. You might try e-bay or Amazon, but by time you buy the parts and make the repairs, you could have bought a new trolling motor.

Install a new water pump impeller making sure the influent and effluent tubes and screen are clear.

Try this site. https://www.manualslib.com/ https://www.ebay.com/itm/1971-4-hp-Johnson-Outboard-Motor-Repair-Service-Manual-Evinrude-4hp-/192360652417

online if its been uploaded not many free marine repair manuals out there

https://www.manualslib.com/ Try here

It is a kayak that doesn't weigh a lot and has straps to carry on your back.

Switch?

Did you get good water flow? Is it 4 cycle? Oil or water pump problem.

idle too low

Sounds like you need to change the charger coil. You need to pull flywheel. Iyt will be a small coil with yellow and yellow with red trace.

Please Check Your Voltage regulator. You May Be able To See Visually If It has Overheated Inspect It. Check All Earth Connections

Did you connect the second needed cable in your new engine? this is a 4-wire cable... Need an adapter 4-6 pins in some cases. This cable is needed to send the data from the engine to the dashboard.

You either have a broken indicator light or serious sending unit problems -- Take it to a dealer to have it repaired before ruining your motor from using it when the cylinder jackets are not getting properly lubricated under load.

I believe you need to put the outboard oil in the OIL tank not premix in the fuel tank I a similar problem with a merc

First of all, check your oil level. Second, you'll find on the engine, port side, above the air intake canals ( just before the throttle body ) a oil pressure switch. Disconnect that switch, goes the light off? If no, it's an electrical issue, check if that wire isn't damaged and shorted to earth somewhere. If YES, then remove the oil pressure switch and connect a presure gauge on the engine. 0 to 5 bar. Start the engine, you should obtain more than 1.5 bar pressure. If OK, replace the oil pressure sensor. If no pressure, have the engine rebuild. Part number 804307-1