I bought a used 86 moto4 225 and it doesn't seem to do more than 40 km/hr (im in canada lol) on my speedometer and bogs out and cant climb hills while my other one wich is the same bike climbs almost any hill and incline in 2nd or 3rd without hesitation and does at least 70. Can anyone help me figure out why cuz ive done all the carb cleaning and stuff but i dont know much else about wut to do.

 

Give it a full service including plug and valve adjustment. If it is still running badly, check charging voltage, should be 13v to 14.5v, then compression. If both machines have similar compression, I would try a bit of substitution from one bike to the other, swap one thing at a time starting with coil, then carb then CDI.