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Honda Cub (Passport) Forums
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88cc upgrade
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<blockquote data-quote="whereshaldo" data-source="post: 176902" data-attributes="member: 10940"><p>So I've rode this around a bit and put in a 102 main jet over the weekend (up from a 98). The 102 is definitely too big, I think I'll dial it back to a 100, it seems a bit slower at WOT than it was with the 98 almost a bit constricted. I'm still not happy with mid throttle however -- from about 1/8th turn to about just under 1/2 turn the bike does not cruise but sort of surges a bit. Its not bucking but it doesn't feel smooth either. To me this sounds like the pilot jet, but I don't really know what I'm talking about and I haven't found a good description of the PB32C in detail. The other thing could be the needle clip position but my understanding of surging at mid throttle is a fuel starvation issue not a fuel oversupply issue. </p><p></p><p>I wish I had 2 carbs so that I could just swap between the two rather than break the whole thing down every time I want to change a jet, but buying a chinese carb (cheap or decent) won't give me apples to apples unless I buy two. These pilot jets from Jets R Us (<a href="http://jetsrus.com/a_jets_by_carburetor_type/jets_keihin_3L_slow_pressfit.html" target="_blank">here</a>) do press in but when I'd replaced the ugly pitted #35 with a new one the bike didn't really run great (smaller holes around the skinny part) and it doesn't take many jets before I could have bought two cheap chinese carbs.</p><p></p><p>Any thoughts or advice?</p><p></p><p>Hal</p></blockquote><p></p>
[QUOTE="whereshaldo, post: 176902, member: 10940"] So I've rode this around a bit and put in a 102 main jet over the weekend (up from a 98). The 102 is definitely too big, I think I'll dial it back to a 100, it seems a bit slower at WOT than it was with the 98 almost a bit constricted. I'm still not happy with mid throttle however -- from about 1/8th turn to about just under 1/2 turn the bike does not cruise but sort of surges a bit. Its not bucking but it doesn't feel smooth either. To me this sounds like the pilot jet, but I don't really know what I'm talking about and I haven't found a good description of the PB32C in detail. The other thing could be the needle clip position but my understanding of surging at mid throttle is a fuel starvation issue not a fuel oversupply issue. I wish I had 2 carbs so that I could just swap between the two rather than break the whole thing down every time I want to change a jet, but buying a chinese carb (cheap or decent) won't give me apples to apples unless I buy two. These pilot jets from Jets R Us ([URL='http://jetsrus.com/a_jets_by_carburetor_type/jets_keihin_3L_slow_pressfit.html']here[/URL]) do press in but when I'd replaced the ugly pitted #35 with a new one the bike didn't really run great (smaller holes around the skinny part) and it doesn't take many jets before I could have bought two cheap chinese carbs. Any thoughts or advice? Hal [/QUOTE]
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88cc upgrade
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