I have a 1972 Evinrude 50hp that does not want to start.
When the key is turned the starter spins the flywheel and the engine tries to start...sometimes. Every so often as it's spinning it will produce some smoke out the exhaust along with loud backfires. Often it will backfire out the carbs as well. It never actually starts.
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Things I have checked:
Compression is 150 on each cylinder
2 new sets of sparks
Ignition system checked with a spark tester
Sparks checked
Rebuilt and cleaned the carbs
Cleaned the carbs again...4 or 5 times just to make sure.
Seated the float, cleaned the jets and all the passageways
Adjusted the needles...alot
Tuned it per the oem manuals instructions
Replaced all the lines
Replaced the impeller
Repaired a sheered flywheel key, and torqued the nut to 105psi
2 new batteries
Replaced the starter brushes twice(the springs kept melting from using the starter for so long. Lesson learned)
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I have tried bypassing the carbs and shooting premix directly into the engine. It backfires the same way.
It has a 3 nipple fuel pump; when I was replacing the fuel lines I accidently switched and plugged the fuel line into the manifold instead of the carb. Then I pumped some fuel. Realizing this was wrong, I disconnected the lines and let it drain. Could this be causing my grief?
I'm running out of things to check, any ideas?
Thanks!
When the key is turned the starter spins the flywheel and the engine tries to start...sometimes. Every so often as it's spinning it will produce some smoke out the exhaust along with loud backfires. Often it will backfire out the carbs as well. It never actually starts.
---------------
Things I have checked:
Compression is 150 on each cylinder
2 new sets of sparks
Ignition system checked with a spark tester
Sparks checked
Rebuilt and cleaned the carbs
Cleaned the carbs again...4 or 5 times just to make sure.
Seated the float, cleaned the jets and all the passageways
Adjusted the needles...alot
Tuned it per the oem manuals instructions
Replaced all the lines
Replaced the impeller
Repaired a sheered flywheel key, and torqued the nut to 105psi
2 new batteries
Replaced the starter brushes twice(the springs kept melting from using the starter for so long. Lesson learned)
---------------
I have tried bypassing the carbs and shooting premix directly into the engine. It backfires the same way.
It has a 3 nipple fuel pump; when I was replacing the fuel lines I accidently switched and plugged the fuel line into the manifold instead of the carb. Then I pumped some fuel. Realizing this was wrong, I disconnected the lines and let it drain. Could this be causing my grief?
I'm running out of things to check, any ideas?
Thanks!
