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omc 9.9/15 owners who want better low speed operation
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<blockquote data-quote="Sinkingfast" data-source="post: 419608" data-attributes="member: 15306"><p>Yes,but if there is a lot of saturated vapor, raw fuel and not vapor that will exacerbate the problem. It will puddle at the bottom during low speed operation. Just look at the head dam to deflect the charge away from the plugs. Those dams are not for vapor deflection but to deflect unvaporized droplets away from the plugs. And yes the operating temp is correct on my motor. Exactly the issue 40 years ago with low speed operation of many of the vintage sleds at the time. Just the change to Mikuni carbs was like night and day. Dry up the fuel charge and things get better. I can run at low speed for couple of minutes..1000rpm or so and when I throttle up no clearing its throat.</p><p></p><p>If one looks at later year heads there is no cooling in the center like in past heads. I figure that helps with fuel vaporization, to keep the plugs cleaner.</p></blockquote><p></p>
[QUOTE="Sinkingfast, post: 419608, member: 15306"] Yes,but if there is a lot of saturated vapor, raw fuel and not vapor that will exacerbate the problem. It will puddle at the bottom during low speed operation. Just look at the head dam to deflect the charge away from the plugs. Those dams are not for vapor deflection but to deflect unvaporized droplets away from the plugs. And yes the operating temp is correct on my motor. Exactly the issue 40 years ago with low speed operation of many of the vintage sleds at the time. Just the change to Mikuni carbs was like night and day. Dry up the fuel charge and things get better. I can run at low speed for couple of minutes..1000rpm or so and when I throttle up no clearing its throat. If one looks at later year heads there is no cooling in the center like in past heads. I figure that helps with fuel vaporization, to keep the plugs cleaner. [/QUOTE]
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