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1989 Yamaha 40 HP 3 cylinder 2 stroke oil injected.
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<blockquote data-quote="stevenmurray1987" data-source="post: 451716" data-attributes="member: 23592"><p>Symptoms </p><p></p><p>Bogging/sluggish under load</p><p>Suspect fuel/carb issue</p><p></p><p>Also</p><p></p><p>Clanking/tapping at low and mid RPM.</p><p>Almost sounds like flywheel hitting starter gear but noise comes from crankcase. Doesn't do it at idle, or at WOT. Could just be drowing out the noise though at high RPM.</p><p></p><p>Suspect piston slap/worn crank bearing or wrist bearing-whatever ya call it. If that is the case I'll probably live with the noise and run it until she spontaneously disassembles.</p><p></p><p></p><p>Bought engine this winter for $800. It was not able to be started in the circumstance of the transaction. </p><p></p><p>Did compression test with engine cold, will do it warm later though. </p><p>Top and middle were 107.</p><p>Bottom was 98.</p><p></p><p>Plugs- bottom one is a little fouley I guess.</p><p></p><p><img src="https://oi63.tinypic.com/24ct7r6.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>Was going to start working my way from fuel tank to carbs to fix the bogging, but wanted to make a post first to see if anyone had any comments for me. Was also going to decarb it. Thanks guys.</p></blockquote><p></p>
[QUOTE="stevenmurray1987, post: 451716, member: 23592"] Symptoms Bogging/sluggish under load Suspect fuel/carb issue Also Clanking/tapping at low and mid RPM. Almost sounds like flywheel hitting starter gear but noise comes from crankcase. Doesn't do it at idle, or at WOT. Could just be drowing out the noise though at high RPM. Suspect piston slap/worn crank bearing or wrist bearing-whatever ya call it. If that is the case I'll probably live with the noise and run it until she spontaneously disassembles. Bought engine this winter for $800. It was not able to be started in the circumstance of the transaction. Did compression test with engine cold, will do it warm later though. Top and middle were 107. Bottom was 98. Plugs- bottom one is a little fouley I guess. [img]https://oi63.tinypic.com/24ct7r6.jpg[/img] Was going to start working my way from fuel tank to carbs to fix the bogging, but wanted to make a post first to see if anyone had any comments for me. Was also going to decarb it. Thanks guys. [/QUOTE]
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1989 Yamaha 40 HP 3 cylinder 2 stroke oil injected.
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