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Honda Cub (Passport) Forums
General
88cc upgrade
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<blockquote data-quote="69ST" data-source="post: 176986" data-attributes="member: 5"><p>Bravo...well done!<img src="/styles/default/xenforo/smilies/thumbsup.png" class="smilie" loading="lazy" alt="(y)" title="Thumbsup (y)" data-shortname="(y)" /></p><p></p><p>Clearly, you've learned more than just the basics. This level of expertise is enough to allow one to tune most carb/engine combos and with a minimum of guesswork. Yes, at times, it can be easy to mistake rich for lean; that said, once you've learned to navigate that fork-in-the-road, life gets a lot easier. </p><p></p><p>One parameter you've noted (great observation, btw), but probably don't fully understand is "slide cutaway" size. In a nutshell, the smaller the cutaway, the faster the fuel flow increases with throttle opening. IOW, smaller cutaway will deliver a richer mixture at low part-throttle. This can go a long way toward eliminating that dreaded transient lean spot, from off-idle to ~1/4 throttle...depending upon the cutaways size/carb and engine combo. Unfortunately, there aren't many slide choices for carbs smaller than 32mm anymore. </p><p></p><p>Now...enjoy the ride<img src="https://lilhonda.com/images/smilies/traildude1.gif" class="smilie" loading="lazy" alt=":yellow70:" title="Yellow CT70 Dude :yellow70:" data-shortname=":yellow70:" /></p></blockquote><p></p>
[QUOTE="69ST, post: 176986, member: 5"] Bravo...well done!(y) Clearly, you've learned more than just the basics. This level of expertise is enough to allow one to tune most carb/engine combos and with a minimum of guesswork. Yes, at times, it can be easy to mistake rich for lean; that said, once you've learned to navigate that fork-in-the-road, life gets a lot easier. One parameter you've noted (great observation, btw), but probably don't fully understand is "slide cutaway" size. In a nutshell, the smaller the cutaway, the faster the fuel flow increases with throttle opening. IOW, smaller cutaway will deliver a richer mixture at low part-throttle. This can go a long way toward eliminating that dreaded transient lean spot, from off-idle to ~1/4 throttle...depending upon the cutaways size/carb and engine combo. Unfortunately, there aren't many slide choices for carbs smaller than 32mm anymore. Now...enjoy the ride:yellow70: [/QUOTE]
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88cc upgrade
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