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Yamaha 50hp 2 stoke high rpm misfire
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<blockquote data-quote="gabeskillzz05" data-source="post: 390171" data-attributes="member: 15066"><p>Been putting together my new to me duck boat the past couple months and finally got it in the water this weekend. 1752 lowe with a tunnel hull. Motor is Yamaha 50 hp 2 stroke. 1998 model 50ejrw with jet drive. </p><p></p><p>The motor starts perfectly everytime, as soon as you hit the key it is on. At idle it purrs along without issue. Once you start increasing RPM it starts to miss around 3,000 RPM and continues up to WOT around 5500RPM. I visually check spark on all three cylinders and it seemed to have very strong spark. I checked compression and have 1) 112 psi 2) 105 psi 3) 112 psi. I pulled the plug wire off one at a time and ran the motor and when I had cylinder 2 unplugged it sounded the same as when it was plugged in so I assume that's my problem area. </p><p></p><p>I'm looking for direction on which route to go, should I be starting with a carb rebuild or does it sound like a ignition problem? </p><p></p><p>Thanks in advance</p></blockquote><p></p>
[QUOTE="gabeskillzz05, post: 390171, member: 15066"] Been putting together my new to me duck boat the past couple months and finally got it in the water this weekend. 1752 lowe with a tunnel hull. Motor is Yamaha 50 hp 2 stroke. 1998 model 50ejrw with jet drive. The motor starts perfectly everytime, as soon as you hit the key it is on. At idle it purrs along without issue. Once you start increasing RPM it starts to miss around 3,000 RPM and continues up to WOT around 5500RPM. I visually check spark on all three cylinders and it seemed to have very strong spark. I checked compression and have 1) 112 psi 2) 105 psi 3) 112 psi. I pulled the plug wire off one at a time and ran the motor and when I had cylinder 2 unplugged it sounded the same as when it was plugged in so I assume that's my problem area. I'm looking for direction on which route to go, should I be starting with a carb rebuild or does it sound like a ignition problem? Thanks in advance [/QUOTE]
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Yamaha 50hp 2 stoke high rpm misfire
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