Crack the gas cap open slightly and try it. The cap vent could be clogged or restricted limiting fuel flow or creating vacuum as things heat up. I don't think temperature affects the belt or pulleys unless there's extreme slippage burning the belt.
The 150cc engine and the 200cc engine are basically the same engine except the 200cc engine is water cooled. Refer to this manual and scroll to Section 2-4 then pages 11 and 12. Drain plug location, oil recommendation and capacity are shown...
The first time I drove a kart was back in the 60's, it was my buddy's kart. I blew through 2 or 3 stop signs because I had no idea how to stop the thing. That could have gotten ugly.
It didn't appear to have any slack in it, maybe it was just the angle of the picture. Generally chains need some flex or droop to allow for runout from the sprockets or they'll bind up.
Usually you can tell which CDI you need is by turning on the headlights. If they illuminate with the engine off you have a DC CDI. If they only illuminate with the engine running you have an AC CDI.
I'm not sure about that, hadn't heard of that ever happening. Do you know how to adjust the governor? Loosen the 10mm bolt on the gov arm at the engine, turn the center stub counter clockwise I believe until it stops, hold the throttle butterfly wide open then tighten the 10mm bolt. This...
Not sure if it will help but the chain needs a little bit of slack or droop. If it's too tight it will bind up and cause the engine to labor. Try another belt as suggested since it may have gotten hot and glazed over. This place has good deals on belts. Check tire pressure too, low pressure will...