Bad spark plugs are plug wires.
Dude, the engine is smoked. Sorry to have to tell you.
Gravity.
Is your oil level?
because it is going uphill and the engine has to work harder?
The CV joint being loose is one of the main causes for a car shaking while it is going uphill. However, a faulty AC and faulty engine could also be the problem.
the tilting of the bike causes the floats in the carburator to rise wich cuts off the fuel intake
No the can go faster downhill or uphill
It requires extra power to go uphill, against the pull of gravity.
downshift
Is the vehicles transmission downshifting to a lower gear as you go uphill? If not, that would be your first place to look. After that I would suspect that your engine timing is not autmatically advancing as it should be.
gravity!
noo