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Honda CT70 Forums
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CT70 88cc upgrade
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<blockquote data-quote="kirrbby" data-source="post: 178492" data-attributes="member: 3972"><p>Welcome to lilHonda Grifter.</p><p>You will likely find some good info in the thread that lukelaw linked...good advice from folks who know. </p><p>I think you could just tweak your stock carb to work fine with 88cc's...including the stock intake. Then decide if you want to upgrade from there. You might squeak a little more performance out of it with a slightly bigger carb. But its never as easy as it seems. </p><p></p><p>Whatever size main jet you have right now, buy the next bigger size...or 2. Then swap in the bigger jet before you install the carb and see how your plug looks after you get it running.</p><p></p><p>The oil pump is recommended, but if the stock pump is working as it should, it's fine to leave it alone. </p><p>Make it easy on yourself for now.</p><p> </p><p>What you SHOULD do, is clean the oil spinner. Replace the timing chain, plus any worn gears/idlers. And consider having the head rebuilt...if it's due, while you have it off. The head is more important than the cylinder for a good running CT70. At a minimum...adjust the valves to spec before your first startup.</p></blockquote><p></p>
[QUOTE="kirrbby, post: 178492, member: 3972"] Welcome to lilHonda Grifter. You will likely find some good info in the thread that lukelaw linked...good advice from folks who know. I think you could just tweak your stock carb to work fine with 88cc's...including the stock intake. Then decide if you want to upgrade from there. You might squeak a little more performance out of it with a slightly bigger carb. But its never as easy as it seems. Whatever size main jet you have right now, buy the next bigger size...or 2. Then swap in the bigger jet before you install the carb and see how your plug looks after you get it running. The oil pump is recommended, but if the stock pump is working as it should, it's fine to leave it alone. Make it easy on yourself for now. What you SHOULD do, is clean the oil spinner. Replace the timing chain, plus any worn gears/idlers. And consider having the head rebuilt...if it's due, while you have it off. The head is more important than the cylinder for a good running CT70. At a minimum...adjust the valves to spec before your first startup. [/QUOTE]
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CT70 88cc upgrade
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