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General Minitrail Talk
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Compression question, yet another...
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<blockquote data-quote="69ST" data-source="post: 174278" data-attributes="member: 5"><p><img src="/styles/default/xenforo/smilies/roflmao.png" class="smilie" loading="lazy" alt=":ROFLMAO:" title="Roflmao :ROFLMAO:" data-shortname=":ROFLMAO:" /> A sober truth with a side of humor...nearly a coffee-on-keyboard moment.</p><p></p><p>Any time the choke is needed to keep the engine running, there's a carburetor problem. Gotta figure out what is restricting fuel flow. My guess(es)...emulsion tube & pilot jet. There may also be a vacuum leak. I'd start with OC's very logical advice. Things only get more complicated beyond this point.</p><p></p><p>Compression is getting weak. Makes me think the intake valve is leaky. If the intake port is clean, this is ruled out, a black intake port confirms it. Those psi numbers are consistent with an oversized tester; gauge & hose volume matter with small displacement. </p><p></p><p>That 4-speed tranny is a sweet upgrade. A little math and optimal sprockets can be determined. Top end should be in the low 40s...with a healthy-running motor.</p></blockquote><p></p>
[QUOTE="69ST, post: 174278, member: 5"] :ROFLMAO: A sober truth with a side of humor...nearly a coffee-on-keyboard moment. Any time the choke is needed to keep the engine running, there's a carburetor problem. Gotta figure out what is restricting fuel flow. My guess(es)...emulsion tube & pilot jet. There may also be a vacuum leak. I'd start with OC's very logical advice. Things only get more complicated beyond this point. Compression is getting weak. Makes me think the intake valve is leaky. If the intake port is clean, this is ruled out, a black intake port confirms it. Those psi numbers are consistent with an oversized tester; gauge & hose volume matter with small displacement. That 4-speed tranny is a sweet upgrade. A little math and optimal sprockets can be determined. Top end should be in the low 40s...with a healthy-running motor. [/QUOTE]
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Compression question, yet another...
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