ProBld GY6 8.3mm Stroker Crankshaft
This is our ProBld 8.2mm stroker performance crankshaft. This is 100% better quality then that stock GY6 crank shaft in your engine now. Here is how the math works with this crank shaft
150cc(57mm bore) with this crankshaft turns to 171cc
171cc(61mm bore) with this crankshaft turns to 193cc
180cc(63mm bore) with this crankshaft turns to 206cc
NOTE: With this crank shaft in most cases the piston skirt will need to be trimmed a couple mm. Other wise the skirt will hit the crank on the way down its stroke. If you plan to use this crankshaft with a 61mm 171cc cylinder, it can’t be the drop in type. The cylinder walls are to thin and will cause failure.
This kit is made for the GY6 A (54mm cylinder stud spacing). This kit comes with the 8.2mm stroker crankshaft with bearings, the longer timing chain, the cylinder spacer and the longer cylinder studs.