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Yes I agree, I should start my own thread, and will do so very soon. In the meantime I'll attempt to answer your questions.
The frame is plenty strong enough, it's a 1981 zz90 frame which is heavier and stronger than the later models and handles just fine. 1000 mile round trip last year, fully loaded with camping gear. Although having said that, I'm sure the later frames would be adequate, as proved by some of the C90 club members who have installed 140cc motors with no complaints.
Tyres are Conti Go rated to 93 mph, and a good compromise between grip and wear. Tubeless tyres would require alloy wheels, a lot of expense for very little advantage.
The biggest problems are the brakes (or lack of), just not meaty enough, and the front suspension which rises as the front brake is applied. Both of these issues will eventually be sorted by fitting telescopic forks and a disk brake.
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