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General Minitrail Talk
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Sputtering ct 70
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<blockquote data-quote="Enginedoctor" data-source="post: 131253" data-attributes="member: 8346"><p>andematt i almost thought it was a thread-jack :caked:, i had to read the op.</p><p></p><p><a href="http://lilhonda.com/webboard/f6/ct70-carb-rebuild-town-time-16011/" target="_blank">okay, here's a carb cleaning write up</a>. if you have the original, i personally would consider cleaning it and shelfing it, but it's really up to you. a good repro can work fine.</p><p></p><p>make sure you have a constant supply of GOOD, clean fuel. i've seen this fool many a people. no joke. bad gas is more than just the reason i'm single :nitro: make sure the fuel lines aren't coming apart and leaving teeny tiny bits of rubber in the fuel supply. i've seen that cause issues too (usually flooding, but sometimes clogging of needle/seat).</p><p></p><p>okay, so if everything fuel delivery is in order, the next symptom you're showing is 'overheating' or too close a valve adjustment. no, they're not the same, but one can cause the other in these engines. pull the 17mm (i think) aluminum caps on top of the head. oil might drip out of the bottom one. keep in mind you're (generally) on top of it when removing it, so it might almost be a 'righty loosie' thing from an upright perspective, if you know what i mean…. there should be .002" or .003" of clearance on the tappet adjustments, WHEN THE VALVE IS CLOSED. i usually run just a bit more on the exhaust. they're a 9mm nut and then a teeny square you can probably just fingernail.</p><p></p><p>try those two things. when you said 4 or 5 miles, that's usually, in my experience, more of a valve adjustment thing. the bike could also be too lean, making it hot, also a carb thing…. try moving the needle in the throttle piston, if you believe that to be the case.</p><p></p><p>let us know how it works out.</p></blockquote><p></p>
[QUOTE="Enginedoctor, post: 131253, member: 8346"] andematt i almost thought it was a thread-jack :caked:, i had to read the op. [URL="http://lilhonda.com/webboard/f6/ct70-carb-rebuild-town-time-16011/"]okay, here's a carb cleaning write up[/URL]. if you have the original, i personally would consider cleaning it and shelfing it, but it's really up to you. a good repro can work fine. make sure you have a constant supply of GOOD, clean fuel. i've seen this fool many a people. no joke. bad gas is more than just the reason i'm single :nitro: make sure the fuel lines aren't coming apart and leaving teeny tiny bits of rubber in the fuel supply. i've seen that cause issues too (usually flooding, but sometimes clogging of needle/seat). okay, so if everything fuel delivery is in order, the next symptom you're showing is 'overheating' or too close a valve adjustment. no, they're not the same, but one can cause the other in these engines. pull the 17mm (i think) aluminum caps on top of the head. oil might drip out of the bottom one. keep in mind you're (generally) on top of it when removing it, so it might almost be a 'righty loosie' thing from an upright perspective, if you know what i mean…. there should be .002" or .003" of clearance on the tappet adjustments, WHEN THE VALVE IS CLOSED. i usually run just a bit more on the exhaust. they're a 9mm nut and then a teeny square you can probably just fingernail. try those two things. when you said 4 or 5 miles, that's usually, in my experience, more of a valve adjustment thing. the bike could also be too lean, making it hot, also a carb thing…. try moving the needle in the throttle piston, if you believe that to be the case. let us know how it works out. [/QUOTE]
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