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General Jet Boat Discussions
a new jet ski jet boat project
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<blockquote data-quote="PSG-1" data-source="post: 259650" data-attributes="member: 6937"><p>Run it at WOT and do a throttle chop (cut it off with the kill switch, key, or stop button, without backing off the throttle) Then pull each plug and compare it to the others, to get an accurate reading of what's going on with the engine. If your carbs have adjustable high speed jets, you can dial them in easily. If they're fixed jets, you'll have to buy different jet sizes and experiment. </p><p></p><p></p><p></p><p></p><p></p><p>it's controlled by a rev limiter in the CDI, probably red-lines at about 7K. The TS900 has a rev limit of 7200, the 1000 had a rev limit of 6900, not sure what yours is. </p><p></p><p></p><p></p><p></p><p></p><p></p><p>Again, this is one of those variables that will require some trial and error. A 16/20 would probably be a good balance of hole shot and top end.</p><p></p><p></p><p></p><p></p><p></p><p>I run non-ethanol fuel most of the time, but when I do run ethanol, I stay with mid or even low grade, as the octane in the ethanol fuel comes from the ethanol. Higher octane= higher ethanol.</p></blockquote><p></p>
[QUOTE="PSG-1, post: 259650, member: 6937"] Run it at WOT and do a throttle chop (cut it off with the kill switch, key, or stop button, without backing off the throttle) Then pull each plug and compare it to the others, to get an accurate reading of what's going on with the engine. If your carbs have adjustable high speed jets, you can dial them in easily. If they're fixed jets, you'll have to buy different jet sizes and experiment. it's controlled by a rev limiter in the CDI, probably red-lines at about 7K. The TS900 has a rev limit of 7200, the 1000 had a rev limit of 6900, not sure what yours is. Again, this is one of those variables that will require some trial and error. A 16/20 would probably be a good balance of hole shot and top end. I run non-ethanol fuel most of the time, but when I do run ethanol, I stay with mid or even low grade, as the octane in the ethanol fuel comes from the ethanol. Higher octane= higher ethanol. [/QUOTE]
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General Jet Boat Discussions
a new jet ski jet boat project
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