1979/1980 150 black max

skeeter25

Cadet
Joined
Jan 21, 2006
Messages
7
Hello, I have a 150black max and it was running fine, all of a sudden it just stopped .<br />I tried to start it up would turn over good but would not kick over.
 

skeeter25

Cadet
Joined
Jan 21, 2006
Messages
7
Re: 1979/1980 150 black max

still early morning here haven't had achance to check it out.
 

skeeter25

Cadet
Joined
Jan 21, 2006
Messages
7
Re: 1979/1980 150 black max

also note. new fuel pump, new fuel lines, replaced trigger had good spark and compression,<br />at that time which was recent.I am going to check spark a littl later today.?, Is there a fuse somewhere on engine?
 

skeeter25

Cadet
Joined
Jan 21, 2006
Messages
7
Re: 1979/1980 150 black max

ok, I checked for spark. There is no spark. When I turn the key turns over strong.
 

andy6374

Lieutenant Commander
Joined
Aug 4, 2005
Messages
1,617
Re: 1979/1980 150 black max

Help us out with a little more info. What cylinders are not getting spark?
 

skeeter25

Cadet
Joined
Jan 21, 2006
Messages
7
Re: 1979/1980 150 black max

no spark on any cylinders.connected continuity tester to pos. I have power every where but what looks like a relay above switch box.Three leads. I don't see it in my manuel.
 

andy6374

Lieutenant Commander
Joined
Aug 4, 2005
Messages
1,617
Re: 1979/1980 150 black max

Directly above the switchboxes is the starting solenoid and this has nothing do with having or not having spark. The rectifier has 4 leads, 2 yellow, grey and red.<br /><br /><br />No Fire At All:<br />1. Disconnect the black/yellow kill wires AT THE PACK and retest. If the engine’s ignition fires, the kill circuit<br />has a fault-check the key switch, harness and shift switch.<br />2. Disconnect the yellow wires from the stator to the rectifier and retest. If the engine fires, replace the rectifier.<br />3. Check the cranking RPM. A cranking speed less than 250-RPM will not allow the system to fire properly.<br /><br />4. Check the stator resistance and DVA output as shown below:<br />WIRE (Read to Engine ground) <br />-Blue 5000-7000 ohms, 180V or more<br />-Blue/White 5000-7000 ohms, 180V or more<br />-Red 90-200 ohms, 25V or more<br />-Red/White 90-200 ohms, 25V or more<br /><br />all this info is available at http://rapair.com/support/Portals/0/downloads/TroubleshootingGuide.pdf <br /><br />good luck
 

skeeter25

Cadet
Joined
Jan 21, 2006
Messages
7
Re: 1979/1980 150 black max

the rectifire is what I was looking at.I'm not sure if I have the ohms meter at the right setting. What is the rx setting. I's not on my ohms meter.
 

andy6374

Lieutenant Commander
Joined
Aug 4, 2005
Messages
1,617
Re: 1979/1980 150 black max

After reading what I wrote decided to look at manual and it seems the rapair page is paritally incorrect or unclear(I should have read more carefully befor posting). The DVA readings are correct but some of the resistence test should be made between the wires (below) and not to engine ground.<br /><br />I copied this from a similar post:<br /><br />Disconnect all 4 red / blue wires from everything. <br /><br />Blu to red = 5,400 - 6,200 ohms<br />Blu/wt to red/wt = 5,400 - 6,200 ohms<br />Red to ground = 125 - 175 ohms<br />Red/wt to ground = 125 - 175 ohms<br /><br />For the trigger the following 3 tests should come out at 1,100 to 1.400 ohms. (all wires disconnected)<br /><br />Brown (without sleeve) to white (with yellow sleeve)<br /><br />White (without sleeve) to violet (with yellow sleeve) <br /><br />Violet (without sleeve) to brown (with sleeve)<br /><br /><br />The rectifier, set the ohm scale to 1000x<br /><br />I copied this from an old post as well. There is a wealth of info if you try the search command. <br /><br />1.disconnect battery<br />2. Using an ohmmeter, connect red lead to ground, black lead alternately to the two stator terminals. Should have continuity<br />3. Connect black test lead to ground, red alternately to stator terminals. Should be no continuity.<br />4.connect black lead to positve terminal on rectifier and red lead alternately to stator terminals. Should have continuity<br />5. connect red lead to positive terminal on rectifier and black lead alternately to the stator terminals. Should have no continuity.<br /><br /><br />Good luck.
 

skeeter25

Cadet
Joined
Jan 21, 2006
Messages
7
Re: 1979/1980 150 black max

To those who helped. I found that the problem was corosion on the kill switch wire .Always start small.Also thanks for the help.
 

andy6374

Lieutenant Commander
Joined
Aug 4, 2005
Messages
1,617
Re: 1979/1980 150 black max

Yep, it sure nice when its the first thing on the "to do list" with spark problems. Good work
 

82RAYSONCRAFT

Seaman
Joined
Aug 21, 2005
Messages
58
Re: 1979/1980 150 black max

Originally posted by andy6374:<br /> Help us out with a little more info. What cylinders are not getting spark?
Hey Andy,<br /><br />Noticed you are a Black Max owner as I am.<br />Here's my delema. I have a 81 225hp merc black max propelling a 82 19' Rayson Craft hull.<br />I had recently purchased this combo that a friend of mine had sold some 4 years ago to a local guy. He had it up for sale and I picked it up for the love of the boat (10 degree vee hull)<br />The problem I'm having is there is what i would call a rough idle or miss from idle up to say 1500-1800 rpm's. Once past this stage it run's fine up to WOT of 5800-6000 rpm. I have rebuilt carbs (which looked very clean), checked & replaced bleeder tubs and valves, rebuilt fuel pump/diaphram. Still run's the same. Poor idle/low rpm performance. I know these motors do not like to idle, but my freind never had this issue before. driving me crazy. Seem's like it is loading up, to rich.<br />I really do not want to take it to my local marine machanic as i have always preformed my own trobelshooting and repairs on everything from autos to 2 stroke motorcycle engines.<br />Have a selco manual.<br /><br />Any suggestions would be appreciated.
 

andy6374

Lieutenant Commander
Joined
Aug 4, 2005
Messages
1,617
Re: 1979/1980 150 black max

82Raysoncraft-<br />Good post, lost of info. But I highly recommend you start a new post. This way everyone can easily find your post and question. <br /><br />The first thought that comes to mind is a lean condition. Make sure the throttle shutters in the carb throats are fully closed at idle. I'll fully respond when you repost so we don't have to repost everything.
 
Top