New here + valve springs

#1
I've never owned a mini bike, only old mopeds, so I've never had to worry about valves. I bought a CT100u recently. The first thing I did was bypass the governor arm with a bent section of a metal hangar. I want to straight pipe it and get a better flowing air filter, but I want to avoid valve float, so I wanna change the springs, right?

What kind of engines do these things have? It's a 98cc, I think Chinese, but is it a clone? What weight springs would I want? And does anyone know the lash I should give?

It's hard to find builds of the smaller displacement stuff, so thanks for any help!
 
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