Selling all pictured. 52mm bore maybe pro mac 800 or 850?? Crank, bearings, oil tank, decomp, cylinder, bar studs. All used parts, cylinder does have some transfer on exhaust port. Intake looks great, but I think it would clean up fine hence the cheap price. Rotates easily. Does have some surface rust see pics. Or give me your cell and i can easily text more pics. Asking $50 and buyer pays actual shipping which i estimate to be about $15. Paypal friends and family.