Tagged: 1988 Johnson 9.9 NO spark.
June 30, 2019 at 8:44 pm #178257
Well, the sensor is the only thing you have not replaced….The resistance reading should be steady, it is just a simple winding. That being said, I would try a different ohm meter just to be sure it is not a meter issue.
As for the stop switch, I think I read that you have replaced it already, correct? In any event, even though the switch passed the ohm meter test, that is no guarantee it is OK…Arcing can still occur even with good resistance tests.
In any event, I’m guessing that your erratic sensor resistance readings are probably the issue, but just check it again with another meter to be sure. Trying to set the sensor air gap without the alignment ring is tricky, because there are no laminations to line up with the machined surfaces on the mag plate. The conventional alignment ring for the universal mag plate systems works for the CD2 systems as well….July 1, 2019 at 11:45 am #178286
Removed the stator plate and clamp under it today. Shaved a tiny bit of the wire covering NEXT to the trigger sensor and have continuity from there to the 5 prong plug in BOTH WIRES no matter how much you move them….NO break in those wires. Done an OHMS test on the trigger where I bared the wires…same thing started at 14 this time and slowly one point at a time up to 55 then back down to 25 then back up. I looked at the side of the sensor that faces the magnet and it looks as if it has hit the flywheel as it looks to be scraped…. maybe…. and also one arm of the stator coil looks to have hit the flywheel SOMETIME. I did NOT move anything myself AND the owner, who I know, said it HAS NOT BEEN TOUCHED from last year. The mag plate was tight AND the flywheel nut was VERY TIGHT when I removed it. I thought there may be play in the mag plate but NO play in the mag plate when screwed down. I am wondering if something came off and got on that magnet like a screw or piece of metal or something or WHY anything under there would be hitting that flywheel….the coil and the sensor are in PERFECT position relative to the mounting blocks or guides under them perfectly flush with them and ran that way FOR YEARS. Ordered a new sensor. If no one had that flywheel off where did that little scrape come from on the coil laminate and what LOOKS like on the sensor too???
Canada Member - 2 Years
Topics: 420July 1, 2019 at 2:15 pm #178288
This mag plate came from a running motor which got destroyed in a garage fire. The sensor coil does show some signs of contact with the flywheel but I’ve noticed that before on other motors to which run good. It doesn’t seem to affect them.
While it was on the bench, I figured I’d do and ohm test on the coils and got steady reading of 41 and 560 ohms resistance. These parts are good and fit for further use.
You must be logged in to access attached files.July 1, 2019 at 3:53 pm #178292
Yep, I am getting 560 to on the coil. I checked grounds to the power pack and power head and have continuity there. I have a nearly new Fluke meter but will check with my old ebay one to be sure. I have the ring from Richard’s timing tools so will use it for sure for air gap. I will test the spark with NO wires hooked up to the kill switch, ground or E in the 5 prong plug. I ordered a new sensor and a cheap set of tools for removing the pins from the 5 prong plug. The next thing I order will be a 10 pound sledge. Thanks mumbles for the pics and ALL the help and will post when I get the sensor.
Canada Member - 2 Years
Topics: 420July 2, 2019 at 9:45 am #178313
Doesn’t take too much debris to rub/damage that plastic sensor….Sometimes there is a little slop in the upper bearing that lets the crank/flywheel wobble around a bit also. I would set the components back .005″ from the coil locating ring using a feeler gage just to be sure there are no further problems….Be sure to replace the plastic mag plate bushing (322435) also, and lube the parts properly with OMC moly lube/outboard oil during assembly….July 2, 2019 at 10:09 am #178316
Yes I will set everything back to be sure. Thank you for the part number as I did read somewhere or maybe seen on THIS OLD OUTBOARD that plastic bushing can cause problems. The mag plate seems tight but we are dealing with fine tolerances here so will cover all bases. Thanks.July 2, 2019 at 1:16 pm #178327
He’s is an amusing guy for sure, brings some humor to wrestling with stubborn old salty outboards…July 14, 2019 at 7:51 am #178831
An update on the 1988 Johnson no fire. After changing everything EXCEPT the external ignition coils I done a test with a multitier on the trigger sensor.The OHM’s were supposed to be 35 to 50. Mine started at about 14 and went on to infinity or as long as the meter was on it the OHM’s went up one point at a time. I replaced the trigger and got strong blue spark. THANK YOU to all that replied to here with GOOD trouble shooting advise. I wanted to send a special shout out to Mumbles for going WAY out of his way to help me with advise and a trigger to fit the engine…thank you.July 14, 2019 at 9:21 am #178837
Glad it is resolved…. Did you remove the components from the original mag plate? Just wondering if the issue was a frayed/shorted lead, or physical damage to the sensor….
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