Replace a damaged or emissions-restrictive head with the Universal Parts QMB139 Non-Emissions Cylinder Head (SKU 151-249). Fully assembled cast aluminum head � 4-bolt deck pattern, machined valve seats, two valve spring/retainer assemblies (intake and exhaust) installed, spark plug boss, finned cooling fins, cam chain tunnel, and both port flanges machined. Oval 2-bolt intake port flange (17mm ID), round exhaust port flange (18mm ID). 70.5mm diagonal valve center-to-center spacing, 69mm valve length. Non-emissions style � no secondary air injection port. Ready to install.
139QMB-based 50cc / 80cc engines:
Intended for off-road use only. Not intended for use on public roads or land.
