Just more problems johnson motor

[trucker28]

Ok here it is thanks to the help from all of you here on this site but just problems after problems. I have a 1964 18HP johnson. I have changed the points,condessers,plugs,water pump and put in carb gasket kit . now I got the motor started and it had ok compression and good spark in both plugs and seem to run pretty good in the barrel so I took the boat out for the first time and started it on the first pull. Then I put it in gear in the way I go but the boat ran really slow with no power so I pulled one plug the motor never skiped a beat and ran the same so I pluged it back in then unpluged the other plug and the motor stalled can anyone tell me what this might be thanks again

 

[tashasdaddy]

Re: Just more problems johnson motor

check your spark on the plug that did not change, you should be running Champion JC4 plugs gapped at .030. you have a single carb, that services both cylinders, so it is not a carb problem.

 

[trucker28]

Re: Just more problems johnson motor

check your spark on the plug that did not change, you should be running Champion JC4 plugs gapped at .030. you have a single carb, that services both cylinders, so it is not a carb problem.

just put in new plugs but I did not check the gap would that make it not spark

 

[F_R]

Re: Just more problems johnson motor

Not likely unless it is closed up from dropping it or something. First things first: Check for spark off the wire. It should jump a 3/16-1/4" gap. If it won't do that, go back in and see what you did wrong under the flywheel. Any cracks on those coils??

 

[trucker28]

Re: Just more problems johnson motor

Not likely unless it is closed up from dropping it or something. First things first: Check for spark off the wire. It should jump a 3/16-1/4" gap. If it won't do that, go back in and see what you did wrong under the flywheel. Any cracks on those coils??

I checked for spark only spark in one plug when i did the points I looked over the coils really good for cracks and they looked real good almost like new. but at the time when the points were chaged i set them at a .20 gap put it together and tryed to start it would not start so I pulled the flywheel off again and the point setting moved do you think it moved again on me and if so how do i keep them tight from moving

 

[alangf]

Re: Just more problems johnson motor

I have had problems with new points that I had to burnish before they would work. Take nothing for granted. I use #400 or #600 sandpaper to clean the points. If you have an ohmmeter you can check the points with it. Make sure the wires are not hooked to the points when you check them with an ohmmeter.

 

[coolguy147]

Re: Just more problems johnson motor

if u did all the right stuff replace cond. and coils and new points. id say that u need to clean ur points. take some white paper fold in half then rub against points. see if any oil happen to get there. then while ur at it use the sand paper and rub about 50-100 times on there and regab points. check spark again if it dont spark check connnections and re clean.


make sure ur spinnning it fast enough when checking

 

[trucker28]

Re: Just more problems johnson motor

if u did all the right stuff replace cond. and coils and new points. id say that u need to clean ur points. take some white paper fold in half then rub against points. see if any oil happen to get there. then while ur at it use the sand paper and rub about 50-100 times on there and regab points. check spark again if it dont spark check connnections and re clean.


make sure ur spinnning it fast enough when checking

Ok thanks I will go and take them all apart this weekend and clean the points with sandpaper question what is the purpose of the sand paper and also are the points suppose to move freely cause they dont seem to be tight and i dont no how to make them tight

 

[lindy46]

Re: Just more problems johnson motor

Did you tighten down the locking screw? That's the larger slotted screw closest to the shaft. You adjust with the smaller screw which is on an eccentric. Make sure the points are on the "top" of the cam when adjusting - the high spot. Set to .020" with the small eccentric screw, then tighten down the locking screw. Then re-check the gap. Set the other set of points. I usually turn the crankshaft a few times (clockwise) with a wrench on the flywheel nut, and then check both sets of points again to make sure they're holding the proper gap. If the points are new, don't over-sand them. Use of a point file is best.

 

[trucker28]

Re: Just more problems johnson motor

Did you tighten down the locking screw? That's the larger slotted screw closest to the shaft. You adjust with the smaller screw which is on an eccentric. Make sure the points are on the "top" of the cam when adjusting - the high spot. Set to .020" with the small eccentric screw, then tighten down the locking screw. Then re-check the gap. Set the other set of points. I usually turn the crankshaft a few times (clockwise) with a wrench on the flywheel nut, and then check both sets of points again to make sure they're holding the proper gap. If the points are new, don't over-sand them. Use of a point file is best.

Ok I am confused which end is the points the point on the shaft or the little round point that touches the little bracket the point is on and the next thing do I set the point at the high end or the low end on the shaft and do I move the shaft to set both sides

 

[coolguy147]

Re: Just more problems johnson motor

do not use a file!!!! it may seem to work at first but the points will wear much sooner. or soemthing else i dont know but dont use a file


use sand paper graduale cleaning to ensure a nice even point. since there new id stick with maybe 50. even 100 isnt that much sanding. oh after ur done sanding blow on the points when there open to get and dust that may go in there by the way. trying now to spit by the way.


now a tip when adjust the points when setting points set them so a .020 gets in there snug but! doesnt move the point make sure. then use a .022 and it shouldnt fit in there by the way.


rotoate the motor a few times to make sure the points stay in place. then place the flyhweel on and use the nut to turn it. u dont have to tighten it yet by the way. when ur sure of good spark


torque it down to the proper spec.

 

[coolguy147]

Re: Just more problems johnson motor

Ok I am confused which end is the points the point on the shaft or the little round point that touches the little bracket the point is on and the next thing do I set the point at the high end or the low end on the shaft and do I move the shaft to set both sides

ok u set the points when there open by the way ok.


when the ring thats said "top" is on the points then u set it on there

 

[trucker28]

Re: Just more problems johnson motor

ok u set the points when there open by the way ok.


when the ring thats said "top" is on the points then u set it on there

when the ring thats said "top" is on the points then u set it on there. what do you mean by that. and do you know what the torque is

 

[trucker28]

Re: Just more problems johnson motor

when the ring thats said "top" is on the points then u set it on there. what do you mean by that. and do you know what the torque is

Ok I just the points and I have spark again in both plugs thanks guys I just hope they stay tight this time but now I need to know what to torque the flywheel at does anyone know

 

[jbjennings]

Re: Just more problems johnson motor

It's 40 to 45 foot-pounds, Trucker. But I hope you tested that spark with a spark tester to see if both will jump a 1/4 inch gap so you don't have to take the flywheel off again. The ring that says "set" or "top" on it is called the points cam. The little edge thing that makes contact with the points cam is called a points cam rubbing block, I believe. The "points" are the little metal discs that or on the other end of the fulcrum from the rubbing block. You set the points gap when the rubbing block is on the highest point of the points cam, which should be at the "O" in top on the points cam. After you adjust one set of points, then you turn the crankshaft until the points cam "top" is under the rubbing block of the other set of points.
If it were me, I'd set them right, and then rotate the crankshaft using a ratchet on the flywheel nut while the flywheel is still off and see if those points get loose. If you have the screw tightened that holds the points on, and they're new points, you should have no problem with those points holding adjustment. If your motor has a spring under the points cam, you need to hold down on the cam while you adjust the points or they will be wrong when you tighten down the flywheel. I can't remember whether your model has the spring under the points cam or not.
Good luck,
JBJ

 

[trucker28]

Re: Just more problems johnson motor

It's 40 to 45 foot-pounds, Trucker. But I hope you tested that spark with a spark tester to see if both will jump a 1/4 inch gap so you don't have to take the flywheel off again. The ring that says "set" or "top" on it is called the points cam. The little edge thing that makes contact with the points cam is called a points cam rubbing block, I believe. The "points" are the little metal discs that or on the other end of the fulcrum from the rubbing block. You set the points gap when the rubbing block is on the highest point of the points cam, which should be at the "O" in top on the points cam. After you adjust one set of points, then you turn the crankshaft until the points cam "top" is under the rubbing block of the other set of points.
If it were me, I'd set them right, and then rotate the crankshaft using a ratchet on the flywheel nut while the flywheel is still off and see if those points get loose. If you have the screw tightened that holds the points on, and they're new points, you should have no problem with those points holding adjustment. If your motor has a spring under the points cam, you need to hold down on the cam while you adjust the points or they will be wrong when you tighten down the flywheel. I can't remember whether your model has the spring under the points cam or not.
Good luck,
JBJ

Thanks for the help I went on your link for the secret files to do the points last nite that is some great info my points and cam set up look just like the one of the pic you had posted