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General Minitrail Talk
Tech Area
HK0 head and cylinder options.
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<blockquote data-quote="69ST" data-source="post: 185615" data-attributes="member: 5"><p>That cylinder really doesn't look bad, at all, in terms of doing an overbore. I didn't see the broken screw you mentioned. That could be the most difficult thing to correct, if there's an EZ-out broken-off in it. It's still not impossible. As I recall, our own faatcaaat posted about dissolving a broken tap (essentially the same as a tap) using alum dissolved in water. A machine shop could do this with little fanfare. Stripped holes are usually no big deal. Helicoils and/or Timeserts have a long history of success. The threads will be a lot stronger afterward.</p><p></p><p>While I prefer the later "12v" style head because of the ball bearing cam, there's not a lot to be gained, otherwise. I agree with OLD CT that sticking with a 6v-era CT70 head will make your life easier. If you were going with a "12v" style crank, then the small dome/"12v" head might become the easier option...but...then you'd open another can of worms - the alternator assembly.</p></blockquote><p></p>
[QUOTE="69ST, post: 185615, member: 5"] That cylinder really doesn't look bad, at all, in terms of doing an overbore. I didn't see the broken screw you mentioned. That could be the most difficult thing to correct, if there's an EZ-out broken-off in it. It's still not impossible. As I recall, our own faatcaaat posted about dissolving a broken tap (essentially the same as a tap) using alum dissolved in water. A machine shop could do this with little fanfare. Stripped holes are usually no big deal. Helicoils and/or Timeserts have a long history of success. The threads will be a lot stronger afterward. While I prefer the later "12v" style head because of the ball bearing cam, there's not a lot to be gained, otherwise. I agree with OLD CT that sticking with a 6v-era CT70 head will make your life easier. If you were going with a "12v" style crank, then the small dome/"12v" head might become the easier option...but...then you'd open another can of worms - the alternator assembly. [/QUOTE]
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General Minitrail Talk
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HK0 head and cylinder options.
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