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Aftermarket Engine/Parts
Honda Nice
Nice 110 Jetting Baseline for Keihin PE20
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<blockquote data-quote="69ST" data-source="post: 115326" data-attributes="member: 5"><p>The only parameter for which you have anything remotely resembling a guarantee of getting close, from the get-go, is the pilot jet size. And that's only because the pilot circuit operates independently, at idle. </p><p></p><p>Above idle, there are multiple moving targets and they are all interrelated. What do know about the airbleed sizing, needle jet internal profile, jet needle taper & profile and slide cutaway? When starting out blind, as you're doing, peak hp & displacement are about the only reference points you have; make no mistake, this is still a roll-your-own proposition. True enough, hp is closely tied to fueling requirements. However, it doesn't tell you anything about one engine's breathing curve compared to another. You also don't know if your PE differs from any other, or how.</p><p></p><p>Unless you wish to venture more deeply into migraine territory, which is highly unlikely to make life any easier, refer back to the basics. Tuning parts for this carb are likely limited to pilot & main jets. Thus, the process is the same as always...find the rich limit under full power/WOT, then drop back 1-2 steps back leaner until you find the best throttle response. </p><p></p><p>There is always the possibility that the carb will be calibrated optimally, for your specific application, straight out-of-the-box. However, an engine can perform well with a lean mixture, these engines can get very hot at sustained speeds above 40-45mph, until there's 4-digit mileage on the clock, and pump gas is likely to be diluted with ever more oxygenates (with wide variations between tankfuls). Frictional heating plus a significant potential of increasingly lean mixtures is a recipe for burnt parts, imo, especially during break-in. </p><p></p><p>FWIW, last year I saw better than 30% mpg difference between fill-ups, with dramatic differences in engine performance, including peak oil temp. How much are you willing gamble to shortcut the carb setup?</p></blockquote><p></p>
[QUOTE="69ST, post: 115326, member: 5"] The only parameter for which you have anything remotely resembling a guarantee of getting close, from the get-go, is the pilot jet size. And that's only because the pilot circuit operates independently, at idle. Above idle, there are multiple moving targets and they are all interrelated. What do know about the airbleed sizing, needle jet internal profile, jet needle taper & profile and slide cutaway? When starting out blind, as you're doing, peak hp & displacement are about the only reference points you have; make no mistake, this is still a roll-your-own proposition. True enough, hp is closely tied to fueling requirements. However, it doesn't tell you anything about one engine's breathing curve compared to another. You also don't know if your PE differs from any other, or how. Unless you wish to venture more deeply into migraine territory, which is highly unlikely to make life any easier, refer back to the basics. Tuning parts for this carb are likely limited to pilot & main jets. Thus, the process is the same as always...find the rich limit under full power/WOT, then drop back 1-2 steps back leaner until you find the best throttle response. There is always the possibility that the carb will be calibrated optimally, for your specific application, straight out-of-the-box. However, an engine can perform well with a lean mixture, these engines can get very hot at sustained speeds above 40-45mph, until there's 4-digit mileage on the clock, and pump gas is likely to be diluted with ever more oxygenates (with wide variations between tankfuls). Frictional heating plus a significant potential of increasingly lean mixtures is a recipe for burnt parts, imo, especially during break-in. FWIW, last year I saw better than 30% mpg difference between fill-ups, with dramatic differences in engine performance, including peak oil temp. How much are you willing gamble to shortcut the carb setup? [/QUOTE]
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Honda Nice
Nice 110 Jetting Baseline for Keihin PE20
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