I have worked on alot of engines but never an outboard 2 cycle, so here goes:
1) The engine is a 1973 Johnson 25 hp, and it idles fine, but from 1/2 throttle to 3/4 throttle it sounds like its running on 1 cylinder and then goes to 2 firing cylinders, and cycles between the two. Just bought it and previous owner says he changed the ignition points, but not sure if he installed them correct. Where are the points, in the distributor?
2) At full throttle it runs fine (and on 2 cylinders) for about 15 seconds and then starts to lose some of its power, but continues to go on two cylinders. Its rubber suction ball style gas tank with no fuel pump, and I wondered if the engine gets starved for gas at full throttle? The gas line is 5/16" I.D., so I figured it was fine but I may be wrong.
2007-06-17 08:14:53 · 7 answers · asked by Le Nuez Vert` 3 in Cars & Transportation ➔ Boats & Boating
I checked the plugs and they look fine, and even put new ones in today that were gapped properly, so its not a fouled plug. Also, brand new gas in the tank too with marine 2 cycle oil at 44:1 ratio.
2007-06-17 08:17:03 · update #1
The points are under the flywheel.The tune up kit part #172523 is available from any dealer,or you can order on line.Go to OMC,click on parts and follow the links.
All engines have a fuel pump of some kind or another,your engines pump is mounted on the crank case.It's an impulse pump operated with crank case pressure.
Your description of the problem sounds very much like lack of fuel.As soon as the engine starts to die,look at the primer bulb,if it is going flat,try the fuel cap on the tank,if you hear air going in then the tank is not vented properly.Leave the cap loose and try the engine once more.
If the tank was fine try another fuel line,there are check valves on either end of the primer bulb that some times fail.The last thing is the fuel pump.
Remember,simple and cheap beats hard and expensive any day.
2007-06-20 00:44:44 · answer #1 · answered by singer 3 · 0⤊ 0⤋
25 Hp Johnson
2016-11-10 00:34:06 · answer #2 · answered by ? 4 · 0⤊ 0⤋
It could be a carburetor problem. They are real simple, remove it and disassemble, soak it in a good parts cleaner, blow it out with compressed air and reassemble with a rebuilt kit. On the points, the point gap is the starting point for setting the points. Go to outboard-boat-motor-repair.com and under old evinrude/johnsons it will give the proceedure for setting the points and the values for testing the coils.
2007-06-18 05:35:22 · answer #3 · answered by renpen 7 · 0⤊ 0⤋
Quick and pain full (sorry mate) take the said motor to a motor vet and get them to tackle the problem its safer and then get your self into a small motor course or take the motor and use as your projectat least you will learn some thing of your motor and besides what u learn COULD save your life some day and you can make a couple of $$$$ on the side.
2007-06-20 17:06:33 · answer #4 · answered by works 4 me 3 · 0⤊ 0⤋
that engine should have a fuel pump on it. but it sounds like you have an ignition problem. points and condensers under the flywheel. also has 2 coils at the rear of the motor. could also be a leaking head gasket. points set at .020".
2007-06-17 12:55:25 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Hi I have a problem with my engine holding forward gear ,it goes into reverse fine . there is a plastic washer that pushes the gear leaver and it is very worn ,was wondering if this is the problem ?
2014-08-24 19:04:26 · answer #6 · answered by Anonymous · 0⤊ 0⤋
New plugs and it has a carburetor not injection pump.If VR than U can disconnect it and mix it 75 to 1 or the plugs will foul.
2016-03-19 03:44:17 · answer #7 · answered by Anonymous · 0⤊ 0⤋