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70 HP motor seems underpowered. How do I troubleshoot.
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<blockquote data-quote="DaleH" data-source="post: 423198" data-attributes="member: 15636"><p>You can also use an in-line 'visible' spark jump tester thingie (forget the proper name, but usually available on loan from some auto parts store) to check the viability of the coil/plug wires too.</p><p></p><p>Get some <u>plastic </u>spark plug boot 'pullers' ... put OB to a fast idle - remove OB cowling - and remove plug wires one at a time. The RPMs should drop whenever a plug boot is pulled. If it doesn't, the coil/plus wire could be dead (see above) or the cylinder could have such low compression that it doesn't add to the RPMs, although it is firing. Sometimes swapping wires (BOTH ends!) from cylinder to cylinder can help you diagnose where the problem lies.</p><p></p><p>NOTE to make this easier, <em>BEFORE</em> testing, w/ OB off of course, I apply dielectric grease liberally to the plug & boot.</p><p></p><p><span style="color: #FF0000"><strong>CAUTION </strong>... moving parts - be careful! Do not use your hand or metal tool ... you WILL get shocked! </span></p></blockquote><p></p>
[QUOTE="DaleH, post: 423198, member: 15636"] You can also use an in-line 'visible' spark jump tester thingie (forget the proper name, but usually available on loan from some auto parts store) to check the viability of the coil/plug wires too. Get some [u]plastic [/u]spark plug boot 'pullers' ... put OB to a fast idle - remove OB cowling - and remove plug wires one at a time. The RPMs should drop whenever a plug boot is pulled. If it doesn't, the coil/plus wire could be dead (see above) or the cylinder could have such low compression that it doesn't add to the RPMs, although it is firing. Sometimes swapping wires (BOTH ends!) from cylinder to cylinder can help you diagnose where the problem lies. NOTE to make this easier, [i]BEFORE[/i] testing, w/ OB off of course, I apply dielectric grease liberally to the plug & boot. [color=#FF0000][b]CAUTION [/b]... moving parts - be careful! Do not use your hand or metal tool ... you WILL get shocked! [/color] [/QUOTE]
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70 HP motor seems underpowered. How do I troubleshoot.
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