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General Minitrail Talk
Tech Area
tuning challenge - off throttle issues
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<blockquote data-quote="69ST" data-source="post: 171696" data-attributes="member: 5"><p>With zero experience working with this engine, all I can offer is generalized tuning suggestions.</p><p></p><p>First thing I'd try is richening the idle mixture, to the absolute limit. The only parameters that come to mind, regarding the lean spot, are reversion and low vacuum...which would mean lazy fuel circuit(s) and poor atomization. Low vacuum means low flow velocity. </p><p></p><p>As I recall, you stabbed-in a hairier cam; that may require a high curb idle rpm. Back in the day, Honda used constant-velocity carbs; perhaps a CB750 carb would be a "natural" fit for the breathing characteristics. I would suggest an MJN24 but, 26mm strikes me as being the lower limit for this displacement & HP. Sourcing a carb that has an accelerator pump might work, but would bring its own issues. Going "sky's the limit" brainstorming...EFI. And, no, I don't see that as practical at this time.</p></blockquote><p></p>
[QUOTE="69ST, post: 171696, member: 5"] With zero experience working with this engine, all I can offer is generalized tuning suggestions. First thing I'd try is richening the idle mixture, to the absolute limit. The only parameters that come to mind, regarding the lean spot, are reversion and low vacuum...which would mean lazy fuel circuit(s) and poor atomization. Low vacuum means low flow velocity. As I recall, you stabbed-in a hairier cam; that may require a high curb idle rpm. Back in the day, Honda used constant-velocity carbs; perhaps a CB750 carb would be a "natural" fit for the breathing characteristics. I would suggest an MJN24 but, 26mm strikes me as being the lower limit for this displacement & HP. Sourcing a carb that has an accelerator pump might work, but would bring its own issues. Going "sky's the limit" brainstorming...EFI. And, no, I don't see that as practical at this time. [/QUOTE]
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tuning challenge - off throttle issues
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