$135-$150 for a complete rebuild (parts & labor) for your LO206.
If you want it tuned on the dyno, that's an add'l $85 (incl. fuel and oil.)
We have some customers that want to do more of the work themselves and save some money.
That's fine too -- just send us the head and we'll freshen it up and send it right back (Most times the same day!)
Disconnect the fuel line to the cab and shake or blow the fuel out of the fuel pump and fuel line. Leave the fuel line off the carb until all the gas evaporates out of the fuel line.
Take the large brass plug out of the bottom of the carb to drain all the gas out of the carb.
Squirt WD 40 in the carb until it runs out of the bottom of the carb. Put the brass plug back in and squirt some more WD 40 in the carb. Put the fuel line back on the carb or put a rubber boot over the fuel inlet of the carb.
Drain the oil overnight. Replace the drain plug and put in 14 ounces of fresh / New Briggs racing oil. Remove the spark plug and put 2 or 3 squirts of oil in the cylinder. Tip the engine upside down and roll around to spread oil around the inside of the motor. Pull the recoil over 3 times the put the spark plug back in. Leave the engine on the end of the compression stroke at TDC.
Tape the valve cover vent, the carb and the muffler with duct tape to keep moisture and critters out.
Thoroughly wash the air filter with hot soapy water from the inside out. Blow dry with an air hose from the inside out.
Store everything (engine and kart) in a dry environment.
This is a good time to clean the entire chassis and inspect for any possible damage
This is also a good time to replace the throttle cable and outer housing. The chain and sprockets are another good thing to inspect and replace if necessary.