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timing is 180 degrees off

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gabe28

New member
Hey all, so I have an 89 mariner 50hp 3 cylinder 2 stroke. I've just bought it for cheap because the previous owner tried to rebuild it replaced all the electrical parts and fuel parts then was having troubles getting it to run. all parts seem good to me. carbs were rebuilt by me (one of the few things not done as he didn't know about carbs), and they are operating well. ignition is the problem im having. all 3 cylinders are getting spark but when I've checked the timing the timing numbers are facing the spark plugs. essentially 180 degrees off. I've made sure that at tdc the timing mark for 0 degrees is facing the timing pointer at the front of the engine. but cranking it faces the rear. I've also checked timing on the other 2 cylinders to see if it is wired incorrectly. the closest to the timing pointer is cylinder 3 but fully retarded it's still showing the .464 mark on the flywheel. I've checked ohms on the trigger wires and they are within spec, same as the stator wires. any ideas on what would cause this? its doing my head in. Thank you
 
Based on your serial number, your engine has the older style 2 piece flywheel. Some people think that removing the flywheel means unbolting it from the center hub but the mistake they make is they don't match mark the center hub up to flywheel when they remove it. This happens more than you might think. Rotate the engine to TDC on #1 cylinder, unbolt the flywheel from the hub and rotate the flywheel to the timing mark at TDC to the pointer. bolt the flywheel back to the hub abd your timing issue should be corrected.
 
fitz73222 said:
Based on your serial number, your engine has the older style 2 piece flywheel. Some people think that removing the flywheel means unbolting it from the center hub but the mistake they make is they don't match mark the center hub up to flywheel when they remove it. This happens more than you might think. Rotate the engine to TDC on #1 cylinder, unbolt the flywheel from the hub and rotate the flywheel to the timing mark at TDC to the pointer. bolt the flywheel back to the hub abd your timing issue should be corrected.
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ive tried that, made sure TDC matches to 0 degrees on the flywheel at the pointer, the issue is when cranking the engine no timing marks show at the pointer. if you move the timing gun around the flywheel they will be opposite to the pointer. basically showing its trying to spark at BDC. I've also checked the flywheel hub to make sure it isn't moving on the crankshaft. do you know what makes the trigger send its signal? is it a magnet in the flywheel or on the crankshaft?
 
Not on that style flywheel. You said the PO replaced ignition components. Do you have a list of the part numbers he replaced? Is the stator mounted in the correct orientation? Some stators are used on different models and mounted differently, are the trigger wires mounted on the correct terminals? I thought the flywheel orientation would have been the fix so I'm guessing here. If memory serves, the factory had changed the firing order on some of these models but I don't know which serial number group. It's going to be something simple..
 
yeah so the stator can sit it basically 3 different positions, I've tried all 3 and it doesn't seem to affect the timing marks at all, ill have to go through and check all the part numbers when I get time this weekend maybe that will be the issue. but all wires are hooked to the right cylinder. the only other thing I could think of was I guess in the flywheel since the magnets are bolted in how would you tell which pole affects the trigger? is there any chance that it could be for a 4 cylinder for example and the wrong pole is set up to the trigger?
 
gabe28 said:
yeah so the stator can sit it basically 3 different positions, I've tried all 3 and it doesn't seem to affect the timing marks at all, ill have to go through and check all the part numbers when I get time this weekend maybe that will be the issue. but all wires are hooked to the right cylinder. the only other thing I could think of was I guess in the flywheel since the magnets are bolted in how would you tell which pole affects the trigger? is there any chance that it could be for a 4 cylinder for example and the wrong pole is set up to the trigger?
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Did you ever get this figured out? I am having the same problem
 
hey, no I didn't. I ended up ordering a new trigger because to me that seems like the only part that could be affecting it even though the resistance is in spec when ive tested it. but while I was waiting for it in the mail I ended up buying a different outboard for a steal and swapped it instead. I may replace the trigger one day and see if I can get that one going but for now it's just going to sit. sorry I can't help
 
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