Motorcycles, Snowmobiles, Go-Carts, ATV's and Golf Carts - 8HP briggs & stratton engine wont start
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probedude05
11-08-05, 04:54 PM
Hey im new here just looking to get some help on starting my engine.
I held the end of the plug wire and pulled the pull start, and it shocked me. But im not getting spark from the plug?!? the plug is good! I checked all the wires and there all intact. is it possible its not getting ENOUGH spark to make the plug spark? cause it shocked my hand really bad, but no spark from the plug :wall: Any help would be great :D
I held the end of the plug wire and pulled the pull start, and it shocked me. But im not getting spark from the plug?!? the plug is good! I checked all the wires and there all intact. is it possible its not getting ENOUGH spark to make the plug spark? cause it shocked my hand really bad, but no spark from the plug :wall: Any help would be great :D
Pilot Dane
11-08-05, 05:37 PM
How do you know the spark plug is good since you said you cannot get it to spark?
Yes, you can get a shock and not get enough voltage to make the spark plug "spark". Generally turning the engine over faster will generate a stronger spark.
Spark plugs can also appear good and really be bad. They can spark under normal pressure, like when you are laying it against the engine block and pulling the cord; but are not able to generate a spark under the higher pressures inside the engine.
When in doubt get a new spark plug and try it again. Plugs are cheap and easy. Also check to make sure the boot on the end of the plug is making good contact with the core of the spark plug wire.
---Just a fun tidbit... When checking the sparkplugs for an aircraft engine they are checked in a tester that fires them under pressure. It's pretty cool. You can actually see a weak plug fire at ambient pressure and by 60 psi it barely makes a flicker.
Yes, you can get a shock and not get enough voltage to make the spark plug "spark". Generally turning the engine over faster will generate a stronger spark.
Spark plugs can also appear good and really be bad. They can spark under normal pressure, like when you are laying it against the engine block and pulling the cord; but are not able to generate a spark under the higher pressures inside the engine.
When in doubt get a new spark plug and try it again. Plugs are cheap and easy. Also check to make sure the boot on the end of the plug is making good contact with the core of the spark plug wire.
---Just a fun tidbit... When checking the sparkplugs for an aircraft engine they are checked in a tester that fires them under pressure. It's pretty cool. You can actually see a weak plug fire at ambient pressure and by 60 psi it barely makes a flicker.
probedude05
11-08-05, 05:50 PM
Thanks for the reply :) I know the spark plug is good because it came off a running rototiller. I ran the tiller right before i removed the plug. The plug is a cj6 and the old plug on the b&s motor was a cj6. I'll just go buy a new plug and some carb cleaner for the hell of it:) another thing. What can cause it to not get enough spark?
Tornerito
11-08-05, 07:45 PM
Did the engine run a short while ago?
Here's something you can try,take the top cover off and check if the gap bettween the coil and the flywheel is right. Here's how, take a sheet of regular piece of paper and fold it in half,then in half again,that should just fit bettween. If it does'nt then loosen the two bolts, that hold the coil and adjust, then bolt down well again.
Another thing I don't recomend testing spark by holding to the cable;<)
Tornerito
Here's something you can try,take the top cover off and check if the gap bettween the coil and the flywheel is right. Here's how, take a sheet of regular piece of paper and fold it in half,then in half again,that should just fit bettween. If it does'nt then loosen the two bolts, that hold the coil and adjust, then bolt down well again.
Another thing I don't recomend testing spark by holding to the cable;<)
Tornerito
probedude05
11-08-05, 10:47 PM
Yea i put the gap at 4 paper thick and nothing, i then put it at one paper thick and i got alittle shock :eek:
Dumb question, But can a cj8 work in place of a cj6? or will it require more output to make it spark?
Dumb question, But can a cj8 work in place of a cj6? or will it require more output to make it spark?
Tornerito
11-09-05, 11:29 AM
Another thing, Now, I don't want you to think I think you're a dunce(I don't know how much you know) But you DO know that the base of the plug has to touch th engine for it to spark??
Also You say you didn't get any shock at 4 papers? That's weird, I've always done it that way and it always worked, Was it originaly closer or farther than that gap?
I don't know anything about plug numbers.
Tornerito
Also You say you didn't get any shock at 4 papers? That's weird, I've always done it that way and it always worked, Was it originaly closer or farther than that gap?
I don't know anything about plug numbers.
Tornerito
probedude05
11-09-05, 09:25 PM
Yes i know that the base of the plug needs to be grounded on the block :p
And at 4 papers it held the wire and had the flywheel turned and didnt get shocked so i lowered it to 1 paper, repeated step one and got shocked :eek: so idk once i get my new carb im gunna get a new plug and see what comes from there. Hopfully i dont need a new magneto or something :wall: Thanks again for the reply
And at 4 papers it held the wire and had the flywheel turned and didnt get shocked so i lowered it to 1 paper, repeated step one and got shocked :eek: so idk once i get my new carb im gunna get a new plug and see what comes from there. Hopfully i dont need a new magneto or something :wall: Thanks again for the reply
puey61
11-10-05, 03:53 AM
Specifically, the air gap between the coil and the magnets is .010". The proper spark plug for that engine is a J19LM unless it happens to be an overhead valve engine, then it would be a RC12YC. If you have a small engine dealer in your area, you could buy a Briggs in-line spark tester, part number 19368, for around $15 and this is the best way to check for coil strength. Either of the plugs you're trying will work for testing purposes and will also allow the engine to run. They're just not the right plug.