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Throttle is hard to move
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<blockquote data-quote="Gotem" data-source="post: 296485" data-attributes="member: 9901"><p>The Johnson 9.9/15 hp from that era have teeth in the tiller arm which control the throttle. If you are running the motor with with the tiller arm raised up, it is possible to slip the teeth so they no longer match up. This may cause the throttle twist part of the handle to be hard to turn. It can also cause the teeth to become worn out (as the grind against each other). This would be the first thing I would check because it can happen inadvertently. There is an article somewhere on the web which discusses this problem in further detail and it also said it was the one flaw with these motors.</p></blockquote><p></p>
[QUOTE="Gotem, post: 296485, member: 9901"] The Johnson 9.9/15 hp from that era have teeth in the tiller arm which control the throttle. If you are running the motor with with the tiller arm raised up, it is possible to slip the teeth so they no longer match up. This may cause the throttle twist part of the handle to be hard to turn. It can also cause the teeth to become worn out (as the grind against each other). This would be the first thing I would check because it can happen inadvertently. There is an article somewhere on the web which discusses this problem in further detail and it also said it was the one flaw with these motors. [/QUOTE]
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