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C70 cylinder (or any other Chinese 47 mm diameter cylinder for horizontals) - yes.
C70 stock 47mm piston together with stock Lazer's 50cc head - no. I told you why -...

OK.

I'm taking a guess: this alloy thing on the pic No.2, with three hoses is some vacuum valve. Thin hose goes to the ioutlet on the intake manifold, one of the thicker hoses goes on the pipe we...

I could not find now some pictures, but there is some contraption that involves thin pipe that comes out of the head, some manifold outlet, few hoses...

Ha, with my English! That would be the day!

It is too much English words for me in one day.

Long story - short: those smog pumps, fume re-circulation systems and all the rest imaginable systems...

Oooooh, thaaat...

Don't bother.

This is thing for environmentally enlightened folks. I don't know is this system even marginally improves emission, but for sure nothing is gonna go south if you...

Vacuum lines!?

When this engine was designed, vacuum was not invented yet. :lol8:

Seriously, would you be so kind to elaborate a bit more your problem?