Universal Parts 139QMB non-emissions cylinder head 151-249 angled three-quarter view showing cast aluminum body 4-bolt deck spark plug boss finned cooling fins cam chain tunnel and intake exhaust port flanges Universal Parts 139QMB non-emissions cylinder head 151-249 angled three-quarter view showing cast aluminum body 4-bolt deck spark plug boss finned cooling fins cam chain tunnel and intake exhaust port flanges
Universal Parts 139QMB cylinder head 151-249 top-down combustion chamber view showing two valve spring retainer assemblies machined valve seats 4 head bolt holes and head gasket sealing surface Universal Parts 139QMB cylinder head 151-249 top-down combustion chamber view showing two valve spring retainer assemblies machined valve seats 4 head bolt holes and head gasket sealing surface
Universal Parts 139QMB cylinder head 151-249 intake port side showing oval 17mm 2-bolt intake port flange and finned aluminum head body Universal Parts 139QMB cylinder head 151-249 intake port side showing oval 17mm 2-bolt intake port flange and finned aluminum head body
Universal Parts 139QMB cylinder head 151-249 exhaust port side showing round 18mm exhaust port flange finned cooling fins and 4-bolt deck surface Universal Parts 139QMB cylinder head 151-249 exhaust port side showing round 18mm exhaust port flange finned cooling fins and 4-bolt deck surface
Universal Parts 139QMB cylinder head 151-249 overhead view with red dimension callout showing 70.5mm diagonal valve center-to-center spacing across intake and exhaust valve seats Universal Parts 139QMB cylinder head 151-249 overhead view with red dimension callout showing 70.5mm diagonal valve center-to-center spacing across intake and exhaust valve seats
Universal Parts 139QMB non-emissions cylinder head 151-249 angled three-quarter view showing cast aluminum body 4-bolt deck spark plug boss finned cooling fins cam chain tunnel and intake exhaust port flanges
Universal Parts 139QMB cylinder head 151-249 top-down combustion chamber view showing two valve spring retainer assemblies machined valve seats 4 head bolt holes and head gasket sealing surface
Universal Parts 139QMB cylinder head 151-249 intake port side showing oval 17mm 2-bolt intake port flange and finned aluminum head body
Universal Parts 139QMB cylinder head 151-249 exhaust port side showing round 18mm exhaust port flange finned cooling fins and 4-bolt deck surface
Universal Parts 139QMB cylinder head 151-249 overhead view with red dimension callout showing 70.5mm diagonal valve center-to-center spacing across intake and exhaust valve seats

Universal Parts

Universal Parts QMB139 Non Emissions Head - 69mm Valves

SKU 151-249
$52.00
Shipping calculated at checkout.
Description

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.

Specifications

  • SKU: 151-249
  • Brand: Universal Parts
  • Engine Type: 139QMB / 139QMA 4-stroke 50cc / 80cc
  • Style: Non-emissions (no secondary air port)
  • Condition: Fully assembled (valves, springs, retainers installed)
  • Valve Length: 69mm
  • Valve Center-to-Center Spacing: 70.5mm
  • Intake Port Diameter: 17mm
  • Exhaust Port Diameter: 18mm
  • Deck Pattern: 4-bolt

Compatible Engine Codes

139QMB-based 50cc / 80cc engines:

Engine Codes
139QMA    139QMB    1P39QMB    1P39QMA-2
YN139QMB    JJ1P39QMB    139FMA-2    BD1P39QMB
BN139QMB    147QMD    Other QMA models    Other QMB models

 

Intended for off-road use only. Not intended for use on public roads or land.

 
Product Diagrams
Features
  • Fully Assembled — Valves, Springs, and Retainers Pre-Installed, Ready to Bolt On
  • Non-Emissions Style — No Secondary Air Injection Port for Performance or Replacement Builds
  • Cast Aluminum Body — 4-Bolt Deck, Finned Cooling Fins, Spark Plug Boss, Cam Chain Tunnel
  • 17mm Oval Intake Port (2-Bolt Flange) | 18mm Round Exhaust Port | 69mm Valve Length | 70.5mm Valve Spacing
  • Fits 139QMB/QMA 50cc/80cc and 157QMJ-Based 125cc/150cc/169cc 4-Stroke Engines
Specifications

SKU: 151-249 | Brand: Universal Parts | Engine: 139QMB/QMA 50cc/80cc 4T | Style: Non-emissions | Condition: Fully assembled | Valve length: 69mm | Valve spacing: 70.5mm center-to-center | Intake port: 17mm (2-bolt oval) | Exhaust port: 18mm (round) | Deck: 4-bolt
Model Fitments

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