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  1. K

    Johnson GT 150 fouling plugs on port side.

    I have a 1987 Johnson GT 150 that dropped approx. 500 RPMs at WOT. Normally runs 5000-5200 RPM WOT and now maximum is 4600-4800 ROM WOT. I pulled the plugs and found the three plugs on the port side appeared either fouled or close to it and the plugs on the other side were fine...dark tan in...
  2. K

    Johnson 150 Rectifier/Regulator Problem

    I am curious if anyone here has received a bad CDI rectifier/regulator from the manufacturer. We are still trying to find out why we are getting high voltage (16-18 Volts) from a new CDI rec/reg. We have gone through all the known troubleshooting and can't find the cause. Talked to CDI and...
  3. K

    Overcharging...

    Replaced rectifier on a Johnson 150...old one was bad. Voltmeter shows 14 volts until increasing RPM to about 3k then voltmeter pegs...Sonar indicates the same voltage that the voltmeter is reading. On one of the parts sites that sell the rectifier there was a statement in bold that said that...
  4. K

    '87 Johnson GT150 Compression Question

    1987 Johnson GT150 - Initial compression test - Results - 100,100,100,100,103,95<br /><br />Decarbed engine - 100,100,96,98,96,95<br /><br />I know it is within limits...but...I am curious what things can cause compression to change 4 or 5 pounds like I got?
  5. K

    Trailer Lights...

    I have an 87 RangerTrail trailer. Is is a 3 wire trailer...there are of course on most pigtails from the tow vehicle 4 wires. The white wire does not exist on the trailer. The way it has worked ever since I got it (in '87) is that until I make a turn or two and a little bouncing happens no...
  6. K

    Shifting Problems Johnson GT150

    This may be a little hard to describe so bear with me. I have used the part descriptions from the parts manual for the motor. After reinstalling the lower unit and inserting the shift rod into the shift rod lever assembly and installing the pin the motor would not go into forward. The shift rod...
  7. K

    VRO / Other Oil Injection Systems Failure Data...

    There have been a lot of posts on this board and others regarding the VRO systems. Some disengage the oil side and others keep them. I found out today that it isn't just the VRO system but the shops in my area tell me that owners of other makes of outboards with oil injection abandon them as...
  8. K

    1987 Johnson GT150 Carb Problem

    Carb Model 25-B-M. When rebuilding the carbs I discovered one carb had damage enternally. What I believe to be the jets (Large tube in middle of carb with smaller tube inside) is cracked on both sides. Appears to be caused by attempted removal at a prior time. The carbs were rebuilt a couple...
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