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Chris taylor Posted on Feb 14, 2018
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I have a 1974 50 hrs johnson it turns over but not getting no spark put new cdi box two new coils new primar bubble new gas lines checked all conections need help

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Brad Brown

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  • GAS Master 19,187 Answers
  • Posted on Feb 14, 2018
Brad Brown
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IF this is a 50 Hp Johnson marine motor, you may have a problem with the flywheel magnet or the stator coil that is under it.

  • 1 more comment 
  • Chris taylor
    Chris taylor Feb 14, 2018

    Thank u ill check that if can get wheel off iv put everything new except that stuff ill start their tomorrow thank u

  • Chris taylor
    Chris taylor Feb 14, 2018

    I've tested some wires comeing down from under the wheel while my son turns the motor over it reading 12 one set wires can't get to tho going up in their

  • Brad Brown Feb 14, 2018

    There are multiple coils on the stator and different taps and coils. You probably need to use a puller to get the flywheel off and check all the wires and magnet.

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5 Related Answers

tombones

  • 3567 Answers
  • Posted on Apr 08, 2009

SOURCE: I have no spark 2000 KTM 125 sx

Before going to the CDI system go ahead and check the kill switches including the side stand switch, with an Ohmmeter. How good is the battery? Check the fuses. Check the wiring harness. Are all wires clean and with a solid connection? Any abraded wires? Check the operation of the ignition switch with a volt ohmmeter. Is the bike in neutral and the neutral light is lit up?

You can download a free PDF factory service manual by going to the website below >
http://www.carlsalter.com/motorcycle-manuals.asp
The manual should tell you in detail how to test the CDI and other electrics.

Please rate this solution. Thanks. > 4 diamonds would be nice!

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Anonymous

  • 125 Answers
  • Posted on Jun 15, 2009

SOURCE: 1987 Honda shadow vt1100c no spark at any plug

The voltage on the coils is present except at the instant of firing. The interruption of the voltage is what causes the coil to fire. The cdi box is what causes the voltage interruption.
The interruption is very hard to detect. You are not the first to be stymied by that box. If you have access to an oscilloscope, I think you can see the pulse if it occurs.

Anonymous

  • 5 Answers
  • Posted on Sep 25, 2009

SOURCE: ktm 450sxf 07 wont start

buy a yamaha

Anonymous

  • 311 Answers
  • Posted on Dec 30, 2009

SOURCE: no spark put on a new cdi box coil good and a new

hi,sounds to me like your cdi pickup unit has failed,i am not 100% certain but this will be located on the end of the crankshaft behind one of the enginecovers,there could be two other possibilities,motox bikes are notorious for breaking wires so check the wiring from the cdi sender unit to the cdi box and the coil,also check your "off"button it may be stuck in the "kill" position..hope this helps..cheers ian

Joe Stanton

  • 1154 Answers
  • Posted on Apr 24, 2013

SOURCE: My Rm 250 wont spark

The Voltage From The Stator To The CDI Should Be Around 40 Volts(AC) At Cranking Speed. Be Sure Your Meter Is Set For (AC) Not (DC). The CDI Changes The (AC) Input Voltage To (DC) Output Voltage To The Primary Terminal At The Coil. An Electrical Shock Hazard Exist If Stator Voltage Is Checked With Engine Running. Always Perform This Test At Cranking Speed (R.P.M.) For SAFETY. 120 Volts (AC) Can Be Present With Engine Running.

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1answer

Grandson has quad 2006 Artic Cat DUX 90 that has no spark is there a way to check the coil or CDI BOX

coil you can test if you have a coil tester but doubt you do. CDI cant be tested. could also be a pick up coil on the stator, ignition switch, kill switch, tether if it has one.
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Yamaha G1 Golf cart...Engine does not crank when key is on and gas pedal is depressed... suggestion??.. I've heard that the CDI might be the issue...Discontinued part?

cranking is turning over which indicates that the battery and starter is doing the job
cranking but not firing indicates ignition or fuel problems
now that you have the correct terminology perhaps you can get an answer
first test is to pull a plug ground it out or use a spark plug tester crank it over to see if there is spark
Good spark forget CDI and coil so look at fuel
NO spark indicated , check for 12 volts from the ignition switch on the start circuit
Ignition switches have to power wires to the coil
on gives power when cranking and the other continues power when the starter is nor engaged
power in both positions move on to next check
no power from the switch to the coil when cranking --get new switch next check if both wires have 12 volts is the ignition circuit
check for safety micro switches not working right up to the CDI
power to the CDI but no spark --replace cdi
power from the cdi nut still no spark --replace the coil
AS to not available
check after marker as the units are generic and made by electronic companies not golf cart manufacturers so it is a distinct possibility that a cdi from some where else will fit
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No spark

Try new spark plugs first, install them and see if it starts..if it won't start, try to fllod it.. them remove the spark plugs and make sure the plugs are wet when you remove them, this proves you are getting gas to the cylinders. No spark...then you will need a factory service manual to check the resistance values according to the manual for the pick-up coil, the cdi box, the main ignition coil, the plug wires. Check the on/off switch on the handlebar if it has one.

Good luck!
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Troubleshooting no spark from coil 1987

Have you checked the pick up coils inside the generator cover. If they are faulty they will not send a signal to the CDI box and in turn you will get no spark from the main output coils
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Low spark on one spark plug

Sounds like you need new wires.....but the cdi box could be working only on one cyl. also........I would try new wires first.....
1helpful
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No spark put on a new cdi box coil good and a new stater

hi,sounds to me like your cdi pickup unit has failed,i am not 100% certain but this will be located on the end of the crankshaft behind one of the enginecovers,there could be two other possibilities,motox bikes are notorious for breaking wires so check the wiring from the cdi sender unit to the cdi box and the coil,also check your "off"button it may be stuck in the "kill" position..hope this helps..cheers ian
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Fresh rebuild now no spark

If it ran before, I would double check your electrical connections. Its more likely you didn't get a connector pushed all the way together or left off a ground wire. The ignition coil specs are generally 1 ohm or less on the primary (small Wire) side, and 5K-10K ohms on the secondary (spark plug) side. Each side should be tested to ground. Pick-up coils are typically open or really large ohm reading in Megaohms normally and around 100 ohms when the magnet on the flywheel passes by. there is no way to test the CDI box other than putting it on a know running bike or getting a known good CDI and putting it on your bike. Double check that the spark plug cap is secured to the high tension lead as well. Testing the stator is a little more complicated, but a quick way is to close the gap on an old spark plug to about 0.010" and see if there is a week spark. If so, the stator will need to be replaced.
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