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Motor bogs down: Cleaning high speed jets, loose bolts
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<blockquote data-quote="kofkorn" data-source="post: 400561" data-attributes="member: 7076"><p>If it is just off idle, check your timing sync. Make sure that when the timing cam is hitting the roller on the carb, the mark on the cam is aligned with the center of the roller. What you describe can be caused by the timing not advancing far enough before the butterfly starts to open. When this happens, the lower RPM of the motor doesn't create enough vacuum to draw fuel out of the intermediate venturi(s). Suddenly your motor is running lean and stumbles dramatically. </p><p></p><p>You can correct this by adjusting the timing cam on the threaded rod. If you pull the cam back, it will advance the timing further before contacting the roller. You'll have to look for a manual to determine the correct adjustment. </p><p></p><p>I had a similar problem with my 1988 50hp when I purchased it earlier this year. After adjusting the timing cam back, it takes off very strong.</p><p></p><p>Good luck!</p></blockquote><p></p>
[QUOTE="kofkorn, post: 400561, member: 7076"] If it is just off idle, check your timing sync. Make sure that when the timing cam is hitting the roller on the carb, the mark on the cam is aligned with the center of the roller. What you describe can be caused by the timing not advancing far enough before the butterfly starts to open. When this happens, the lower RPM of the motor doesn't create enough vacuum to draw fuel out of the intermediate venturi(s). Suddenly your motor is running lean and stumbles dramatically. You can correct this by adjusting the timing cam on the threaded rod. If you pull the cam back, it will advance the timing further before contacting the roller. You'll have to look for a manual to determine the correct adjustment. I had a similar problem with my 1988 50hp when I purchased it earlier this year. After adjusting the timing cam back, it takes off very strong. Good luck! [/QUOTE]
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Motor bogs down: Cleaning high speed jets, loose bolts
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