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General Minitrail Talk
Honda CT70/Z50 Registry
DAX spark problem
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<blockquote data-quote="69ST" data-source="post: 185818" data-attributes="member: 5"><p>Sounds to me like this engine needs a rebuild. Smoke usually means the rings aren't sealing well...scored/pitted cylinder walls. I would expect to find the intake port blackened...meaning a leaking valve and time for a valve job. This is garden-variety stuff for a ~50 year old engine.</p><p></p><p>While you're at it, may as well split the cases, for a thorough cleaning & inspection. The shift forks are likely worn. Now's the time to replace them, + their pins. Thrown-in a new set of clutch discs & case screws and...voila!...first-rate rebuild, ready for another 4-5 decades.</p><p></p><p>BTW, best to have the cylinder overbore determined before ordering the new piston & rings. I'd want to know what the finished bore size will be...could be anything from standard to fourth O/S. It all depends upon the amount of taper (wear) and depth of any scoring/pitting, if present. If you're looking for a little more power, a 52mm (88cc) bore-up kit can be had for the same money as overboring the original cylinder.</p><p></p><p>IMO, better to go completely through an engine, leaving nothing to chance. It's cheap insurance.</p></blockquote><p></p>
[QUOTE="69ST, post: 185818, member: 5"] Sounds to me like this engine needs a rebuild. Smoke usually means the rings aren't sealing well...scored/pitted cylinder walls. I would expect to find the intake port blackened...meaning a leaking valve and time for a valve job. This is garden-variety stuff for a ~50 year old engine. While you're at it, may as well split the cases, for a thorough cleaning & inspection. The shift forks are likely worn. Now's the time to replace them, + their pins. Thrown-in a new set of clutch discs & case screws and...voila!...first-rate rebuild, ready for another 4-5 decades. BTW, best to have the cylinder overbore determined before ordering the new piston & rings. I'd want to know what the finished bore size will be...could be anything from standard to fourth O/S. It all depends upon the amount of taper (wear) and depth of any scoring/pitting, if present. If you're looking for a little more power, a 52mm (88cc) bore-up kit can be had for the same money as overboring the original cylinder. IMO, better to go completely through an engine, leaving nothing to chance. It's cheap insurance. [/QUOTE]
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General Minitrail Talk
Honda CT70/Z50 Registry
DAX spark problem
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