Reliability and Power Suggestions

for Chinese 2 stroke RELIABILITY:

Use sandpaper on glass to plane flat the cylinder head and top of cylinder for a good seal.
Replace the cheap nuts and bolts that come with the chinese kit and replace them with good ones from Sick Bike Parts for $10.
Buy a good carburetor. Choices: 16mm or 18mm Mikuni, 16mm Dellorto PHBG

Replace the stock CDI with a Performance CDI and coil ($75) that will reduce vibrations at high RPM and increase power with a stronger spark. The stock engine has way too much vibration which causes nuts to loosen which is the #1 reliabilty risk.
Replace the stock upper connecting rod bearing (where the rod connects to the piston) with a better one.

for More Power:

Lathe off 1mm-1.5mm from the stock head (
till the cranking pressure is 135psi) for more compression and power.
Use tubing to extend the intake tract length which gives more engine power at low RPM.

For even More Power:

Make a Jaguar Torque Pipe.
Use JBWeld to redirect transfer port flow more rearward in the cylinder.

For More Speed:

Use a rotary tool to change the cylinder ports for more power and higher RPM (more speed). If vibration is more annoying at higher RPM then buy a lighter titanium wrist pin and drill lightening holes in the piston (or even more troublesome but better: remove the flywheel and drill holes in it for better balance).
Buy a Rock Solid reed valve and ask them to size the part where the carb connects to the reed valve for  the needed diameter for your new carb (or just have your machine shop make one if necessary.).

(read all my other pages for details on above suggestions)