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Johnson 70 hp spark test question
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<blockquote data-quote="bnt5" data-source="post: 357609" data-attributes="member: 13957"><p>I am troubleshooting my 1978 Johnson 70 hp. It has been bogging so I am going through everything and decided to do a spark test. Went to autozone grabbed a spark gap tester and tried it out...nothing on all three cylinders, yet the motor starts and runs albeit with difficulty. What gives? I grounded the tester and set gap distance to 1/2" fired over the motor and got no spark whatsoever on all three plug wires. Bad tester? Bad power pack? Would engine run with a bad power pack?</p><p></p><p>I can start the motor fine, idle it fine but when I give it throttle it likes to bog down, however if I rev it up a little in neutral then shift into drive it will run wide open just fine, if I idle a little more then give gas it bogs. This motor is driving me crazy. :shock:</p></blockquote><p></p>
[QUOTE="bnt5, post: 357609, member: 13957"] I am troubleshooting my 1978 Johnson 70 hp. It has been bogging so I am going through everything and decided to do a spark test. Went to autozone grabbed a spark gap tester and tried it out...nothing on all three cylinders, yet the motor starts and runs albeit with difficulty. What gives? I grounded the tester and set gap distance to 1/2" fired over the motor and got no spark whatsoever on all three plug wires. Bad tester? Bad power pack? Would engine run with a bad power pack? I can start the motor fine, idle it fine but when I give it throttle it likes to bog down, however if I rev it up a little in neutral then shift into drive it will run wide open just fine, if I idle a little more then give gas it bogs. This motor is driving me crazy. :shock: [/QUOTE]
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