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    1988 ProV 150 Overheated Alarm went off too late Seized rings top right cylinder 0

    Hi Thank you for looking at this. I messed up. Got engine super hot. Seized rings top right cylinder 0 psi. All other cylinders 90 to 100 psi. 1988 ProV 150 I took head off and see some slight metal transfer to the cylinder wall. took carbs off and manifold off thinking I can take piston out...
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    1988 Yamaha 150 ProV No Spark

    Hi All, I just replaced The CDI or power pack or brain as it is sometimes refered to. My previous one was not working on 2 cylinders. Bought a used one and ran great on a 20 minute test run. Came in flushed the motor out, no problem. This was 2 days ago. I checked the fuse in the lower wiring...
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    Needed waterflow diagram for 1988 ProV 150 Yami

    Hi all I purchased a motor that had bad salt intrusion. I have removed the heads gotten all or most of the debris out and the motor is still overheating. I have a great manual that has almost everything except the water flow chart for that motor. If you have this chart please post with any...
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    What is the yellow wire?

    I just bought a replacement tachometer for my 88 150. The tachometer looks identical to my old tachometer except where the green and black wire come out, there is an additional yellow wire. Does anyone know what this yellow wire if for?
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    Beeps or chirps

    Hi All, I just repowered my boat w/ a 1988 Yami 150. One thing that I have noticed is when I turn the key on I don't get the "beep beep beep" noise. My alarm is good. I have a friend w/ 2 1988 yami 150's and his chirps when he turns the key on. Does anyone have an idea on what I should check...
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    1988 Yamaha 150 ProV fuel pump question?

    Make a long story short I found out I have a bad fuel pump. It failed the suck blow test. I can't seem to find a rebuild kit and or I am not sure which gasket to buy. I figure I might as well do both pumps while I am at it. Can anyone spread some light on the situation. Thank You
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    How can I get all the salt/ salt water out of my tank?

    I have a 19' CC and recently I sucked up about a gallon of salt water threw the gas vent. I have sucked out most if not all of the water. Is their any aditave that will help get any residual/ salt out of the tank. Thank You
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    Warning buzzer not beeping when key is turned on?

    I just put a 1988 ProV 150 on my boat. Had harness that came w/ motor. Buzzer works and I did get the motor hot and buzzer did work. What can I check to see why it doesn't chirp when I turn the key on? I see so far 21 people have read this post but no replies? I guess you all are as miffed as I am.
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    How do I find the year of my Yami?

    Hi All, I just bought a used Yami. I think it's an 89. I need to replace my water pump and thermostats. My code is 6J9 L and Model is ProV 150G. Thank You. Also do you guys know the Part Numbers?
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    1989 Yamaha Gague problems

    Hi All, I just repowered my '92 Key West CC w/ a aprox 89 Yamaha 150 ProV. Motor came off a bass boat. Tack was not working. Had access to another used yamaha tack and nothing seems to work either. Trim on the gague and lights on bottom don't work and temp alarm doesn't work. How can I test...
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    Engine Bang (Part 2)

    Hi all, Lots of you guys were helpful when I was trying to diagnose the motor bang I was having. Like hitting a log. Then it kept happening. I finally hobbled the boat in. Most of you thought it might be the clutch dog. Unfortunately that's not the case. When we dropped the lower unit the spline...
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    Engine Banging?

    Hi All, New problem. I have a 1984 Johnson 115. I went out yesterday and on the way in it felt like the motor hit something. It did not. Then it happened again and again and again. every few seconds. The motor was jumping or banging. The motor itself was running smooth. I ended up ideling in to...
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    Fuel vent question?

    I have a 1992 19' Key West w/ low gunnels. Last week I took it about 10 miles off shore fishing. When I got back in the inlet I lost power and had to be towed in. I got water in the gas. I seem to have a good seal on the tank cap. What I think may have happened is I may have sprayed water into...
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    1984 Johnson 115 Water Pump question?

    Hi All, Yesterday morning I started the motor on the trailer w/o turning on the water. Ya dumb I know. I ran it for 30 seconds to a minute before realizing. I have been told their is like a plastic wheel that touches metal that forces the water through the engine. I took the boat out for a few...
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    Running Hotter Plugs

    I have a 1984 Johnson 115. When I purchased the Boat/ Motor the unit had no thermostat. I posted here and the consensus is that I need to put in a T-stat to burn the fuel more efficiently. The engine does smoke and I do have unburnt 2 stroke oil dripping from the prop. My mechanic said he has...
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    How do I hook up over heat alarm?

    Hi All, I recently purchased a boat w/ a 1984 Johnson 115. The motor did not have a overheating alarm. Well, I bought I believe the propor buzzer but it did not come with instructions on how to hook it up to the ignition. I believe I have 6 plug locations on the back of the ignition. The buzzer...
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    Engine Ventilating or Aerating

    Hi All I have a 19' Key West w/ a Johnson 115 that I recently purchased. I am trying to learn as much as possible and this site is very helpful. I am having a problem w/, I believe, aerating or ventilation. When I am running in light chop I am constantly venting or aerating the prop. The motor...
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    Johnson 1984 115 excessive smoke problems

    I recently purchased this engine and it seems to smoke a lot. The motor will usually fire imediately and stay running. Yesterday I noticed for the first time oil drip from the prop. I guess thats unburnd fule oil. I am running 50:1. No VRO. My mechanic said the thermostat had been removed and I...
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    1989 Johnson Kill Switch Problems

    Hi All, I have read a lot of posts on your forum to try and fix my problem but I am not quite there yet. Problem is I turn the key off and the motor keeps running. Had to put vice grips on the gas line to kill the motor. With the other posts I think I have 3 possibilities. Bad ignition (not...
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