jetting question
08-12-2003, 02:48 AM
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jetting question
What kind of actual performance gains can be had from propper jetting? The plug colour I have know is a dark chocklate brown, would I gain as much as 200 - 300 more rpm by jetting a bit leaner or is the risk of dammage not worth the extra speed? (Dumb question)
08-12-2003, 05:58 AM
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It doesn't sound to me like you're too far off now. Are you checking the plug color right after a hard run without any idle time? Even a short time idling in to the dock will darken the plugs.
08-12-2003, 06:04 AM
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If jetting is too rich & you leaned to correct A/F ratio you could gain 200+ rpms. If jetting is too lean, you may gain 200+ for a short time before the motor melts down. Key point is correct jetting from being too rich. I remember where Hot Boat had a motor on a dyno & motor gained 85 hp in getting jetting right on.
08-12-2003, 03:53 PM
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Plug reading was done after running at 4500 rpm for 10 minutes or so but not held wide open. I shut the engine down right away and checked plugs
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