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General Minitrail Talk
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'72 CT70 winter restore project
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<blockquote data-quote="69ST" data-source="post: 184757" data-attributes="member: 5"><p>The trailbikes 51mm crank is the only one of which I am aware, that fits the 6v/3speed alternator. Here's the brain-twister, the same 52mm piston that fits the stock crank, also fits the stroker cranks...should be the same "short rod" compression height, right? Yet, as I recall, a 47mm piston with "long rod"/12v compression height is needed. That's never made sense to me. However...there is a means of figuring this out for oneself. Start out by dry-fitting the original piston (rings removed for ease of installation); if you end up with negative deck height (piston standing proud of the cylinder at TDC, a 12v/long rod piston is needed.</p><p></p><p></p><p></p><p>Few websites are very specific when it comes to crank/piston/alternator fitment. Dratv is an exceptional resource. Some of the EU vendors go by key dimension(!). Part of the problem is that Japanese doesn't translate directly into western languages, including English. Running it through a program like Google translate, Babelfish, etc, transrates Japanese into Engrish. And, I agree, Web!ke is in a category of their own when it comes to lack of details.</p></blockquote><p></p>
[QUOTE="69ST, post: 184757, member: 5"] The trailbikes 51mm crank is the only one of which I am aware, that fits the 6v/3speed alternator. Here's the brain-twister, the same 52mm piston that fits the stock crank, also fits the stroker cranks...should be the same "short rod" compression height, right? Yet, as I recall, a 47mm piston with "long rod"/12v compression height is needed. That's never made sense to me. However...there is a means of figuring this out for oneself. Start out by dry-fitting the original piston (rings removed for ease of installation); if you end up with negative deck height (piston standing proud of the cylinder at TDC, a 12v/long rod piston is needed. Few websites are very specific when it comes to crank/piston/alternator fitment. Dratv is an exceptional resource. Some of the EU vendors go by key dimension(!). Part of the problem is that Japanese doesn't translate directly into western languages, including English. Running it through a program like Google translate, Babelfish, etc, transrates Japanese into Engrish. And, I agree, Web!ke is in a category of their own when it comes to lack of details. [/QUOTE]
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'72 CT70 winter restore project
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