GX200 and Clones, Predator 212 and 224 - 63.5mm Stroke Crank

Forged steel 63.5mm stroke crank for GX200, Clones, and Predator engines adds a serious amount of displacement, compression, and power to the GX200 family of engines. 

THIS CRANK HAS A 1" ROD JOURNAL AND ONLY WORKS WITH BRIGGS STYLE 1" JOURNAL RODS. WILL NOT WORK WITH STANDARD GX200, CLONE, OR PREDATOR TYPE RODS. 

For use with the following ARC "stroker" rods:

This crank is offset ground to a 63.5mm stroke from a standard clone 58mm stroke crank. It has a solid 1" rod journal, a 3/4" output shaft, and standard clone sized main journals and flywheel taper. You will need to use one of the above connecting rods and a cut down Wiseco 0.640" compression height piston with 0.490" wrist pin to make this work.

If you want to put this crank in the TC225 block with an ARC 6765 rod you can cut  0.029" off of the crown of a two ring Wiseco piston and you'll have a 258cc engine with a forged flat top piston sitting at zero deck. Here is an example of what your compression ratio would look like if you built this with a 16cc Shredder head and an 0.045" head gasket: 

It is advisable to set your compression ratio by how much you machine off of the crown of the piston. If you were to use a 0.640" compression height piston that has been cut down to .550" with this same rod and crank in the TC225 block your compression ratio will look like this: 

And if you used the ARC 6768 3.575" rod with this same 63.5mm crank in that same TC225 block with a the same Wiseco cut down to .550" your piston will only be 0.010" in the hole at TDC, and your compression will look like this: 

The above are just a few ideas on how you would put this kind of setup together. You'll need a really high flowing head to take advantage of the displacement, something that moves 135cfm or more if you want to make any usable power at higher RPMs. 

Because the compatible rods are designed for a Briggs engine, you will have to do quite a bit of clearancing on the crankcase, crank, rod, and cam. You will need to be comfortable with this before even attempting to build an engine with this crank. THIS IS NOT A SIMPLE BOLT-ON PART, AND IT NOT FOR BEGINNER ENGINE BUILDERS.