The Taida GY6 170cc Big Bore Engine Package is beyond ideal for capitalizing on the potential of the GY6 150cc Long A-Case. This kit allows you to significantly increase your displacement to the maximum safe volume of 170cc without any machining or opening up your engine case!
With the cylinder kit are two piston options, the stock cast piston and the upgraded forged piston. In terms of function and performance you can expect approximately the same results. However, when it comes to strength, reliability, and safety, you may want to upgrade to the forged piston. With a cast piston, the melted alloy is poured into a mold then finely cleaned and machined until suitable for use. Whereas forged pistons start with a solid cylindrical block of aluminum alloy then stamped and further machined. One of the main points to get out of this is that cast pistons require additional silicon added to increase the hardness and strength of the piston, while a forged piston starts off as a hardened material and is shaped to specifications. For high performance applications and high RPMs, cast pistons can be too brittle and lead to failure.
While you're at this stage of engine building, we highly recommend electing for the cylinder head upgrades at the same time. While sticking with the GY6 150cc A-Case, these upgrades would be the most significant upgrades you can do to get everything you can out of your engine. These upgrades coupled with proper tuning, expect performance results on par with a stock 180cc!
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