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General Minitrail Talk
Tech Area
New rebuild, new carb, wont idle
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<blockquote data-quote="69ST" data-source="post: 189684" data-attributes="member: 5"><p>It shouldn't run out of breath at high rpm. If it does, that's telling you that something is not right, i.e. there's a choke point/bottleneck. Think of the engine as a complete system, everything has to be balanced well enough to work with everything else...otherwise the end result is <img src="/styles/default/xenforo/smilies/poop.png" class="smilie" loading="lazy" alt=":poop:" title="Poop :poop:" data-shortname=":poop:" />, even with good quality parts. The CL70 uses the same head...and was factory rated 6.5hp @10000rpm. All else being the same, 88cc should be capable of roughly that same hp level...but at ~2000rpm lower. That's the effect of increased torque. Adding more bumpstick would allow the engine to breath efficiently at higher revs...and that's where you'd realize more hp. I'd guesstimate somewhere in the 7hp range is possible from your 88cc setup...with cam, carb & exhaust optimized...with the engine spinning willingly beyond 9000rpm.</p></blockquote><p></p>
[QUOTE="69ST, post: 189684, member: 5"] It shouldn't run out of breath at high rpm. If it does, that's telling you that something is not right, i.e. there's a choke point/bottleneck. Think of the engine as a complete system, everything has to be balanced well enough to work with everything else...otherwise the end result is :poop:, even with good quality parts. The CL70 uses the same head...and was factory rated 6.5hp @10000rpm. All else being the same, 88cc should be capable of roughly that same hp level...but at ~2000rpm lower. That's the effect of increased torque. Adding more bumpstick would allow the engine to breath efficiently at higher revs...and that's where you'd realize more hp. I'd guesstimate somewhere in the 7hp range is possible from your 88cc setup...with cam, carb & exhaust optimized...with the engine spinning willingly beyond 9000rpm. [/QUOTE]
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New rebuild, new carb, wont idle
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