If you have an automatic tranny, and the fluid is low, it may not gear down on the hills and may possibly stall.
Check this out first.
Gravity.
Engine is in need of tuning.
Time for a tune up.
You will smell it burning and your engine will slip as you pull away in first gear and while going uphill.
because it is going uphill and the engine has to work harder?
Going uphill puts an extra load on the engine. It might be time for a tune up.
No the can go faster downhill or uphill
It requires extra power to go uphill, against the pull of gravity.
downshift
the tilting of the bike causes the floats in the carburator to rise wich cuts off the fuel intake
Engine straining Low coolant? Cooling fan not working? Plugged or restricted radiator? Water pump? System airbound? Defective radiator cap?
On my 1999 Chev Suburban the answer is the fuel filter. It appears when going uphill and trying to give it a lot of gas the engine is not get enough and misfires. I replace the fuel filter and the light goes away. It comes back after a while and I just change the fuel filter. I have 227,000 miles on my suburban