[SLESTAK75]

First most common mods are to open up the intake and exhaust. This can be achieved by removing the stock air filter box and replacing it with a Uni or K&N type filter attached to a 6-8" piece of 1-1/2" pipe (PVC or similar). This can be attached to the carb with a rubber 1-1/2" to 1-1/4" reducer coupling available in plumbing section of the hardware store. The muffler can be opened and gutted, Or remove the outlet piece and open the outlet hole to around 3/4" to 1". This must be accompanied by an increase in the main jet size. To determine whether your jet size is correct you can "read" the spark plug. Remove the plug, clean well, and replace. Take buggy on a 10 min run at full throttle. Stop immediately and remove plug and inspect. Tan color to dark brown is where you want it. If the plug is white you are running lean and hot and will damage your engine. You will need a larger main jet. If the plug is black you are running rich and need a smaller jet. For basic mods to intake and exhaust, most run better with a 125-128 main jet.