I have a 97 scrambler 500 4x4. I have replaced the piston with a new .40 over wiesco model with new rings, rebuilt head with no new modifications to that, and cleaned the carb out.She idles but will not produce power without stalling out. Someone suggested that i need to rejet the carb because of the new piston size. What size jets? which jets? and what company makes them for the 97 scrambler should i go with to make this thing come back to life? Thank you for your help!

 

Since you said you cleaned the carb, I think I would first check to make sure you have re-assembled the carb correctly and completely cleaned all the jets and orifices. Just by increasing the bore size does NOT mean you need to re-jet.

 

i cleaned the carb. I even took it off and had an atv tech. check it out for proper operation. It works fine and its VERY clean.