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Honda Cub (Passport) Forums
General
88cc upgrade
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<blockquote data-quote="69ST" data-source="post: 176377" data-attributes="member: 5"><p>Congrats, sounds like the process went well, especially for a first-timer.<img src="/styles/default/xenforo/smilies/thumbsup.png" class="smilie" loading="lazy" alt="(y)" title="Thumbsup (y)" data-shortname="(y)" /></p><p></p><p>All things the same, the stock 16mm Keihin carb should be adequate to feed all those added, fire-breathing, cubes<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" />. There is some top-end power potential in a larger 18-20mm metered air & fuel leak (VM18, or VM20 mikuni, 18mm Kehin)...especially when paired with a more aggressive cam. Consider, however, that those gains are going to mimic what you got from tuning the stock 72cc for more hp; they won't register as obviously on the seat-of-the-pants dyno, as the effects of added displacement...even if the tuning level is taken out to 55-60mph levels, the practicable limits of 88cc.</p><p></p><p>I'd suggest going up 1 tooth on the countershaft sprocket. With a CT70, that's usually the limit of 88cc torque and well worthwhile for a road machine. Worst case, the machine feels a little overgeared for your use...there's still the rear wheel sprocket, which could with be upsized for the larger C/S sprocket, or downsized 1 tooth for the stocker. Might seem like hair-splitting but, with small displacement & minimal torque, dialing-in the gearing makes a difference. With the kind of constant use and the miles accumulating, you will notice and enjoy the improvements. Small improvements, multipied by mileage equal cubic satisfaction...<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: 176377, member: 5"] Congrats, sounds like the process went well, especially for a first-timer.(y) All things the same, the stock 16mm Keihin carb should be adequate to feed all those added, fire-breathing, cubes;). There is some top-end power potential in a larger 18-20mm metered air & fuel leak (VM18, or VM20 mikuni, 18mm Kehin)...especially when paired with a more aggressive cam. Consider, however, that those gains are going to mimic what you got from tuning the stock 72cc for more hp; they won't register as obviously on the seat-of-the-pants dyno, as the effects of added displacement...even if the tuning level is taken out to 55-60mph levels, the practicable limits of 88cc. I'd suggest going up 1 tooth on the countershaft sprocket. With a CT70, that's usually the limit of 88cc torque and well worthwhile for a road machine. Worst case, the machine feels a little overgeared for your use...there's still the rear wheel sprocket, which could with be upsized for the larger C/S sprocket, or downsized 1 tooth for the stocker. Might seem like hair-splitting but, with small displacement & minimal torque, dialing-in the gearing makes a difference. With the kind of constant use and the miles accumulating, you will notice and enjoy the improvements. Small improvements, multipied by mileage equal cubic satisfaction...:yellow70: [/QUOTE]
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88cc upgrade
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