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Misfire at specific RPM with bigger carb
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<blockquote data-quote="alfaguy" data-source="post: 370412" data-attributes="member: 6911"><p>After fitting a larger carb, I took my Evinrude 25/30 to the river and it ran really well except for a severe misfire at 2200 rpm. It is fine at 2000 and 2500 but totally breaks up at 2200. I installed a new power pack, coils and plugs (but not wires) two years ago. </p><p></p><p>The "new" carb is a choke type pre-84 and the engine is a 1988 model, but I blocked off the primer feed hoses with plugs. I rebuilt the carb and the transfer holes under the large plug were clear. I wonder if crud could have gotten back in there.</p><p></p><p>Any suggestions on where to start looking for the cure?</p></blockquote><p></p>
[QUOTE="alfaguy, post: 370412, member: 6911"] After fitting a larger carb, I took my Evinrude 25/30 to the river and it ran really well except for a severe misfire at 2200 rpm. It is fine at 2000 and 2500 but totally breaks up at 2200. I installed a new power pack, coils and plugs (but not wires) two years ago. The "new" carb is a choke type pre-84 and the engine is a 1988 model, but I blocked off the primer feed hoses with plugs. I rebuilt the carb and the transfer holes under the large plug were clear. I wonder if crud could have gotten back in there. Any suggestions on where to start looking for the cure? [/QUOTE]
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Misfire at specific RPM with bigger carb
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