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General Minitrail Talk
Concours Section
79 mile 1980 c70 passport
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<blockquote data-quote="69ST" data-source="post: 189820" data-attributes="member: 5"><p>Congrats...sounds like you snagged a mechanically new bike that could just do with some cosmetic freshening.<img src="/styles/default/xenforo/smilies/thumbsup.png" class="smilie" loading="lazy" alt="(y)" title="Thumbsup (y)" data-shortname="(y)" /></p><p></p><p>If you're seeing 150psig, then the engine is probably like new, internally. I would strongly recommend you learn how to clean the oil spinner...that's the chamber located behind the throwout bearing flange, inside the face of the clutch...not just the oil screen. I do the initial/break-in oil spinner cleaning at the 300-mile mark, it's cheap insurance. There will be a surprising amount of shiny metal bits & clutch debris inside. Thereafter, annually or every 1000 miles (if you cover a lot of miles) will keep the engine clean and free of the clutch debris and metal particles that often leave these engines in need of rebuilding by the 2K mile mark. Beyond that, a few short-interval oil changes, especially for the initial 500 miles and using known, high-quality, bike oil (JASO-spec/wet clutch compatible) such as Honda GN4, Valvoline, Castrol, is all it takes to get well into 5-digit service life from one of these little motors. </p><p></p><p>I'd also recommend using clear, inline, fuel filters. Place them as close to the carb inlet as possible, especially if you use rubber fuel hose...it's highly susceptible to 2020 era pump fuel. If you see rust particles, or what looks like threads, accumulating you'll know there's a problem upstream of the carb...with ample warning. If this were mine, I'd use Tygon fuel hose. It's transparent enough to see dirt and air pockets and doesn't dissolve when exposed to E10.</p></blockquote><p></p>
[QUOTE="69ST, post: 189820, member: 5"] Congrats...sounds like you snagged a mechanically new bike that could just do with some cosmetic freshening.(y) If you're seeing 150psig, then the engine is probably like new, internally. I would strongly recommend you learn how to clean the oil spinner...that's the chamber located behind the throwout bearing flange, inside the face of the clutch...not just the oil screen. I do the initial/break-in oil spinner cleaning at the 300-mile mark, it's cheap insurance. There will be a surprising amount of shiny metal bits & clutch debris inside. Thereafter, annually or every 1000 miles (if you cover a lot of miles) will keep the engine clean and free of the clutch debris and metal particles that often leave these engines in need of rebuilding by the 2K mile mark. Beyond that, a few short-interval oil changes, especially for the initial 500 miles and using known, high-quality, bike oil (JASO-spec/wet clutch compatible) such as Honda GN4, Valvoline, Castrol, is all it takes to get well into 5-digit service life from one of these little motors. I'd also recommend using clear, inline, fuel filters. Place them as close to the carb inlet as possible, especially if you use rubber fuel hose...it's highly susceptible to 2020 era pump fuel. If you see rust particles, or what looks like threads, accumulating you'll know there's a problem upstream of the carb...with ample warning. If this were mine, I'd use Tygon fuel hose. It's transparent enough to see dirt and air pockets and doesn't dissolve when exposed to E10. [/QUOTE]
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79 mile 1980 c70 passport
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