NCY ENGINE BORE UP TOOL 690S06

Tool to increase the bore of the crankcase for the installation of
oversized cylinders. Simply install it on the crankcase and pair
it with a ½â€ chuck drill. The assembly includes bolts and dowel.
It is suitable for several types of crankcase such as GY6 125-
150cc, usually used on most Chinese scooters, ATVs and buggy.