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General Minitrail Talk
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'72 CT70 winter restore project
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<blockquote data-quote="69ST" data-source="post: 184979" data-attributes="member: 5"><p>Best guess is that it's way down on compression. Take a peek inside the intake port; if it's anything but clean, grey, aluminum the intake valve hasn't sealed properly in a long time. </p><p></p><p>With an 88cc tune, the stock exhaust is adequate. For that matter, it's good enough to handle 50mph horsepower, regardless of displacement...it's just that bigger displacement tunes make more power than that.</p><p></p><p>Regardless of how you end up building these engines, take the time to split the cases for thorough cleaning & inspection. The odds of finding worn shift forks as sky-high. Those are easy to replace, once the engine is open...and cheap insurance against having to go back in before the rebuild has seen less than 5-digit mileage.</p></blockquote><p></p>
[QUOTE="69ST, post: 184979, member: 5"] Best guess is that it's way down on compression. Take a peek inside the intake port; if it's anything but clean, grey, aluminum the intake valve hasn't sealed properly in a long time. With an 88cc tune, the stock exhaust is adequate. For that matter, it's good enough to handle 50mph horsepower, regardless of displacement...it's just that bigger displacement tunes make more power than that. Regardless of how you end up building these engines, take the time to split the cases for thorough cleaning & inspection. The odds of finding worn shift forks as sky-high. Those are easy to replace, once the engine is open...and cheap insurance against having to go back in before the rebuild has seen less than 5-digit mileage. [/QUOTE]
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'72 CT70 winter restore project
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