no spark at no 1 plug

[hardwatergrampa]

i have a 1976 40 hp johnson no fire at the top plug if i hook the top coil to the lower plug it fires the plug so iam thinking the points or condencer are at falt am i right i already changed the plug so its not that

 

[Vic.S]

Re: no spark at no 1 plug

If you are saying that if the top coil is connected to the bottom plug you get a spark then it suggests that the top coil, its points and its condenser are OK.

Check that you can get a good spark from each plug lead (forget the plugs) if you can look again at the plugs. If you cannot then look at the coil, the points (and the condenser) for whichever is not giving a good spark.

You can swap parts around from one cylinder to the other to check them. If the fault moves with the component you have found the faulty one.
Test the plugs in the same way. Swap'em over. If the fault moves with the plug it's a faulty plug.

 

[hardwatergrampa]

Re: no spark at no 1 plug

thanks ill have to look at it again

 

[hardwatergrampa]

Re: no spark at no 1 plug

even after moving things around i still get no fire in the top plug so coail and plugs are good

 

[bktheking]

Re: no spark at no 1 plug

So that leaves points and condensor.

 

[hardwatergrampa]

Re: no spark at no 1 plug

thanks that is what i was thinking as well ? i had the motor in the repair shop last spring was there longer then it should have bee the guy told me he was having trouble with one of the cyclenders not firing he said he put in new points and condencer he no longer works in that feld gonna go pull the flywheel and see what i find thanks

 

[bktheking]

Re: no spark at no 1 plug

Could be dirty points, check the faces of the points, they need to be shiny. I have the same issue with a 6hp johnson in my garage, today's project.

 

[hardwatergrampa]

Re: no spark at no 1 plug

worked most of the day trying to remove flywheel even hammered on the top of the puller that thing wont move put the air gun to it and snaped 2 of the bolts that hold the puller on got 1 out and one to go never had one come off so hard also my son inlaw did a compression test on the motor today 140 in the cyclender thats not firing and 138 in the lower so i would say that that is a good sign

 

[bktheking]

Re: no spark at no 1 plug

Yup , compresssion is awesome. Had my flywheel off in 2.3 seconds with an air hammer and a screw driver, points were black and oily, replaced both, awesome spark and runs like a champ.

 

[hardwatergrampa]

Re: no spark at no 1 plug

i take it that the screwdriver was to set the points .good job getting it done once i get the broken stud out i think ill put the puller back on and let it sit for the week and keep checking it got my 25 hp going might swap out motors till i get this one running

 

[bktheking]

Re: no spark at no 1 plug

No it was to take up the endplay on the crank, basically to hold the flywheel up.

 

[hardwatergrampa]

Re: no spark at no 1 plug

broke off 2 more puller bolts today had to drill them output the puller back on and put as much tork on the puller i could get ive hit the puller screw bolt so many times the puller screw is stsrtin to bend gonna let it set for a coule days to see if that helps never ever had one come off this hard

 

[bktheking]

Re: no spark at no 1 plug

Soak the top of the flywheel where the nut is with something like pbblaster for a couple of days and then try again.

 

[tx1961whaler]

Re: no spark at no 1 plug

broke off 2 more puller bolts today had to drill them output the puller back on and put as much tork on the puller i could get ive hit the puller screw bolt so many times the puller screw is stsrtin to bend gonna let it set for a coule days to see if that helps never ever had one come off this hard

You're supposed to be using shouldered stripper bolts with the puller, but at least grade 8 bolts at a minimum.

Anyway, with the 1976 motor aren't there (2) sets of breakers and only one coil under the flywheel, and (2) external coils?

 

[hardwatergrampa]

Re: no spark at no 1 plug

Soak the top of the flywheel where the nut is with something like pbblaster for a couple of days and then try again.

thats what i did gonna give it a couple days and hope it does some good

 

[hardwatergrampa]

Re: no spark at no 1 plug

You're supposed to be using shouldered stripper bolts with the puller, but at least grade 8 bolts at a minimum.

Anyway, with the 1976 motor aren't there (2) sets of breakers and only one coil under the flywheel, and (2) external coils?

yes i think you are right from what i remember from last year i used the bolts that came with the puller and broke those yesterday so used what i had on hand today as i couldnt get any grade 8 i cant remember how the gradeing markings went for the bolts the ones i used today had 3 bars on them

 

[1946Zephyr]

Re: no spark at no 1 plug

I would smack it with a rubber mallot from underneith the flywheel, while the puller is tensioned up. I use a steel hammer, but I won't recemend it to anyone.

 

[bktheking]

Re: no spark at no 1 plug

I would smack it with a rubber mallot from underneith the flywheel, while the puller is tensioned up. I use a steel hammer, but I won't recemend it to anyone.

For stubborn ones I do to Zeph, your not alone. I still love my air chisel.

 

[tx1961whaler]

Re: no spark at no 1 plug

I use a length of 2x2 and a hand sledge. I usually don't recommend it because somebody might get carried away and break their flywheel....

 

[hardwatergrampa]

Re: no spark at no 1 plug

are you guys for real on hitting the under side of the flywheel i have used a pice of oak wood to remove them on lawn mowers before i plan on working on it before work tomorrow