These engines are just an incredible bargain, at 100 bucks, that doesn't buy 1/5 of an Animal engine. There is very little to do to prep these stock motors.
All that one needs do is to remove the governor and oil sensor, and adjust the valve lash (I went between .002 and .003). I went ahead and put 18 lbs. valve springs to prevent float, but in box stock I am not sure that that is legal. Of course legality is not that big a deal for this motor because this is a predator 212 and is not legal clone racing anyway, just for fun.
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There are timing marks (a divot) on the cam gear and the crank gear to put them in the correct timing positionThe governor works by centrifugal force pushing the lever, when pressed it turns the motion into vertical rotational force, this is what biases the carburetorThis is what an arm is attached to to actuate the carburetorRemember to retrieve all the washers, they are between every part. Us a magnet for the metal ones. Another way of removing the governor is to take off the flywheel us a punch to take the entire governor shaft out, you have to close the new hole you made by threading in a set screw. I just kept the shaft in and dealt with the metal clip from the inside. It's a pain on the butt but you'll get it. I just used two picks (probes) until it came off.With the oil sending unit and the controller transistor out it leaves an extra female connector that you can put in another kill switch with (pull to ground)
Diameter / Thread Pitch / Length
|Connecting Rod Bolt||M7x1.0||9|
|Cylinder head bolt||M8x1.25||17|
|Flywheel Nut (Special)||M14x1.5||54|
|Rocker Arm Pivot Lock Nut (Special)||M6x.5||7|
|Rocker Arm Pivot Bolt||M8x1.25||17|
|Crankcase Cover Bolt||M8x1.25||17|
|Muffler Mounting Nuts||M8x1.25||17|
|Cylinder Head Intake Bolts||M6x20 1.00||17|
|Cylinder Head Exhaust Bolts||M8x25 1.25||17|
|Crank Shaft Bolt||5/16"-24 x 3/4" Fine Thread||30|
|Crank Case Mounting Bolts||5/16"-24 x 3/4" or M8x20 1.25||17|
|Output Shaft||3/4" * 2.43"||Keyway 3/16"|
|Spark Plug||NGK BP-6ES||Gap .7mm - .8mm|
Note: If you only have an Inch Pound torque wrench multiply the number of ft/lbs by 12 (FT/LBS X 12 = Inch/LBS). Also, to torque the rod, I covered the bolts in oil (the same oil I use in the engine) and alternate tightening the bolts 1 Ft/Lbs. at a time until 9 Ft/Lbs. is reached on both bolts.
Clone Thread at DIY
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