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General Minitrail Talk
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'72 CT70 winter restore project
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<blockquote data-quote="fatcaaat" data-source="post: 184802" data-attributes="member: 1656"><p>Back to the cranks, I was really interested in putting a 51mm tb stroker in my recent 95cc engine to bring it to 117cc but it wouldn't allow me to use the piston I have for it. The piston I have is an old school 12.5:1 high domed racing piston that is designed for the short crank, and thus, not a match. I decided I wanted the high compression mated with the big cam, over the extra stroke, and smaller domed piston...at least for this particular build. </p><p></p><p>The trailbikes team did something interesting on their designs...they made their stroker cranks use the same piston deck height as the xr50's or the "long rod" cranks that started in the 80's. This, in essence, removes all the confusion about what works with what...instead all you need to consider is matching the head to the piston dome profile...Old head, new head, and z50 head...three different pistons, all the same deck heights matched to the stroker crank. And three cranks...12v, 6v 3-speed, and 6v 4-speed.</p></blockquote><p></p>
[QUOTE="fatcaaat, post: 184802, member: 1656"] Back to the cranks, I was really interested in putting a 51mm tb stroker in my recent 95cc engine to bring it to 117cc but it wouldn't allow me to use the piston I have for it. The piston I have is an old school 12.5:1 high domed racing piston that is designed for the short crank, and thus, not a match. I decided I wanted the high compression mated with the big cam, over the extra stroke, and smaller domed piston...at least for this particular build. The trailbikes team did something interesting on their designs...they made their stroker cranks use the same piston deck height as the xr50's or the "long rod" cranks that started in the 80's. This, in essence, removes all the confusion about what works with what...instead all you need to consider is matching the head to the piston dome profile...Old head, new head, and z50 head...three different pistons, all the same deck heights matched to the stroker crank. And three cranks...12v, 6v 3-speed, and 6v 4-speed. [/QUOTE]
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'72 CT70 winter restore project
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