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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: 174313" data-attributes="member: 5"><p>The intake port & visible portion of the valve should both be clean metal. Any discoloration would be the result of a leaking intake valve. If the port is clean, gray, aluminum...throughout...the valve is sealing properly.</p><p></p><p>Ever ride a bicycle with more than one gear ratio? Remember have much farther you traveled, per crank revolution, in top gear...and how much more effort was required? On steep grades, you probably had to choose between downshifting and walking the bike uphill. That's usually the easiest analogy I can provide. When a motorcycle is overgeared (a.k.a. gearing that's "too tall") the engine can't pull it and feels weak on the "seat-of-the-pants dyno". I suspect that that your setup is way overgeared...a K1 sprocket combo paired with a 4-speed...and that's why it has "no umph" above 30mph. There's simply not enough torque available. In oversimplified terms, I'd try a 45t wheel sprocket to go with the 15t cog on the countershaft.</p><p></p><p>As for finding stardust in the oil..."it depends". With a new engine, or fresh rebuild, it's to be expected, especially in the early stages of break-in. The first few changes will be very sparkly. With a fully broken-in engine (anything with more than 1000-1500 miles on the clock) stardust is not a good sign. That said, it may mean nothing more than than an oil spinner that's long overdue for a cleaning. IOW, it's filled to the point that it can no longer remove the abrasive <em>gar-bahge</em> from the oil.</p></blockquote><p></p>
[QUOTE="69ST, post: 174313, member: 5"] The intake port & visible portion of the valve should both be clean metal. Any discoloration would be the result of a leaking intake valve. If the port is clean, gray, aluminum...throughout...the valve is sealing properly. Ever ride a bicycle with more than one gear ratio? Remember have much farther you traveled, per crank revolution, in top gear...and how much more effort was required? On steep grades, you probably had to choose between downshifting and walking the bike uphill. That's usually the easiest analogy I can provide. When a motorcycle is overgeared (a.k.a. gearing that's "too tall") the engine can't pull it and feels weak on the "seat-of-the-pants dyno". I suspect that that your setup is way overgeared...a K1 sprocket combo paired with a 4-speed...and that's why it has "no umph" above 30mph. There's simply not enough torque available. In oversimplified terms, I'd try a 45t wheel sprocket to go with the 15t cog on the countershaft. As for finding stardust in the oil..."it depends". With a new engine, or fresh rebuild, it's to be expected, especially in the early stages of break-in. The first few changes will be very sparkly. With a fully broken-in engine (anything with more than 1000-1500 miles on the clock) stardust is not a good sign. That said, it may mean nothing more than than an oil spinner that's long overdue for a cleaning. IOW, it's filled to the point that it can no longer remove the abrasive [I]gar-bahge[/I] from the oil. [/QUOTE]
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Compression question, yet another...
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