Rick, 143-634012 is an H35, model # 45391H. 143-665082 is a later model HS 50, model # 67142B with the larger 2.7" bore. Cross checked with Sears Parts Direct and using piston numbers on Parts Tree. The HS was in the Tec manual, but not the H35.
No reason to look again Rick. It is in Markus' link.
I just noted the 143.634012 is not listed in the 123-page manual that is linked here on OldMiniBikes. Markus' link is the 124 manual which looks almost identical and does have that listing. Odd.
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