1972 6hp johnson

[seas]

i have spark on only one cylinder y not the other one

 

[jbjennings]

Re: 1972 6hp johnson

YOu need to pull the flywheel, and probably consider a new coil, condenser, and spark plug wire for the offending cylinder. Since these parts are not that high, you might even want to change it all out and be done with it. Try this thread for help and don't forget your torque wrench!:
http://forums.iboats.com/showthread.php?t=294072
Good luck,
JBJ

 

[seas]

Re: 1972 6hp johnson

you replied to my problem thanx, but i bought a whole new tune up kit. i bought this motor from someone who got it at a estate sale it was siezed,i unsiezed it.now after the tuneup kit still one spark could improper point gap cause it.how do i set points. also i disconnected the magneto do u have a photo of the magneto from underneath. so i can re assemble it

 

[the machinist]

Re: 1972 6hp johnson

If you are that unfamiliar with the operations of the motor, a suggestion is to purchase a used factory service manual. One place to look is on e-Bay.

You could have a corroded wire connection anywhere under the flywheel from the points, coil, or even at the spark plug end of the coil wire.

 

[seas]

Re: 1972 6hp johnson

everything was replaced new coils,condensors,points,all bran new

 

[seas]

Re: 1972 6hp johnson

1972 6hp johnson did complete tune up,replaced everything only have spark in one cylinder.wat could it b.

 

[AlTn]

Re: 1972 6hp johnson

did you replace the spark plug wires?..which cylinder isn't working?

 

[tx1961whaler]

Re: 1972 6hp johnson

1972 6hp johnson did complete tune up,replaced everything only have spark in one cylinder.wat could it b.

You did not assemble it correctly. All of the wires need to be in place, including the spark plug wires into the coils. The points need to be gapped at 0.020" at the highest point on the cam lobe. Make sure both spark plug are good.

 

[seas]

Re: 1972 6hp johnson

okay i think i know the problem the cylinder with spark i can see space between the cam n point but the other one i cant gap to stay i pull out the feeler gage n the point moves back in a flush position wats wrong

 

[tx1961whaler]

Re: 1972 6hp johnson

Rotate the crank clockwise until the highest point of the cam lobe is lined up with the plastic rider on the points. Loosen the phillips head points mounting screw and adjust the points to open to 0.020" using the other slotted points cam screw. Tighten down the phillips head screw. Both sets of points should open to 0.020" at the high point of the cam as the cam rotates around.

 

[seas]

Re: 1972 6hp johnson

do u mean the keyway on cam

 

[seas]

Re: 1972 6hp johnson

i didnt replace the wires i did replace the plugs

 

[jbjennings]

Re: 1972 6hp johnson

THe highest point, not necessarily the key way. On a lot of the cams, there will be a stamped "TOP" in the cam. I usually set mine at the "O" in TOP. But, wherever the rubbing block causes the contact point to move the farthest, that's where you set it. A corroded spark plug wire end could easily be the problem. Something is not right, and you'll have to pick through it and find it.
Good luck,
JBJ

 

[seas]

Re: 1972 6hp johnson

number 2 cylinder not sparking y i did everything but change wires, cant seem to gap point does not want to stay locked in keeps moving back

 

[Rick.]

Re: 1972 6hp johnson

number 2 cylinder not sparking y i did everything but change wires, cant seem to gap point does not want to stay locked in keeps moving back

You say it moves back. This could be normal as points open and close once with every full one turn of the flywheel. Read this over, it might help. http://forums.iboats.com/showthread.php?t=294072 I agree an OMC factory service manual will serve you well. Best of luck. Rick.
EDIT: I had a look at the attachment myself and the picture of the points has an item identified as the points cam. This cam in not round but oblong and it opens and closes your points as the flywheel turns. Make sure the points are on the high spot of this cam when you set them.

 

[tx1961whaler]

Re: 1972 6hp johnson

The points close when the cam rotates. They open back up as the cam rotates. If the point's mounting screw is tight, then the point gap at the high point of the cam should not change.

 

[seas]

Re: 1972 6hp johnson

okay i have spark on both cylinders thank u now i want to apply fuel at wat setting does the needle go on thanx again i set the points on o in top like u said bingo blue sparks does this mean she will run

 

[tx1961whaler]

Re: 1972 6hp johnson

Have no idea if it will run. Needs spark, compression, and gas.
Here is the carb setting procedure, courtesy of Joe Reeves:
(Carburetor Adjustment - Single S/S Adjustable Needle Valve)
(J. Reeves)

Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

 

[seas]

Re: 1972 6hp johnson

thank u