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72cc 47 mm High Performance Big Bore Cylinder Kit for 50cc QMB139 Scooter Engines

SKU: K72-7916

72cc 47 mm High Performance Big Bore Cylinder Kit for 50cc QMB139 Scooter Engines

SKU: K72-7916
$38.99
  • Our 72cc scooter big bore cylinder kit is great for increasing overall performance on small under-powered 50cc QMB139 scooter engines
  • Engine kit increases engine bore size from 50cc to 72cc and includes everything shown in the image; cylinder, rings, and gaskets
  • 30 Day Warranty
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Description

Our 72cc scooter big bore cylinder kit is great for increasing overall performance on small under-powered 50cc QMB139 scooter engines.

Engine kit increases engine bore size from 50cc to 72cc and includes everything shown in the image; cylinder, rings, and gaskets.

This 72cc scooter engine kit increases low end acceleration as well as top speed.

This high performance scooter big bore engine kit is easy to install. Combine with a high performance carburetor and high performance exhaust and get peak performance from your 50cc gas scooter.

Note: This high performance cylinder kit is only compatible with 4-stroke 50cc QMB139 engines.

⚠ WARNING California Residents: Proposition 65 Warning

Specifications

Bore: 47 mm
Piston Height: 33 mm
Cylinder/Cylinder Head hole spacing: 50 mm x 50 mm
Piston Wrist Pin Diameter : 12 mm
Piston Wrist Pin Length: 37 mm
Compression height : 17 mm
Ring Diameter: 47 mm

Questions

I have dazon diamond 1p139qmb 69mmvalves. Will my parts work on this kit
While we have not confirmed compatibility with that specific model, if your unit is a 50cc QMB139 engine, this big bore cylinder kit should be a good fit.
Instructions included? And can you keep the stock carb and exhaust or are the HP carb and exhaust required?
Instructions for this kit are not included. You can keep the stock carburetor and the exhaust, as long as they are still working fine. Although, you can certainly replace or upgrade your stock carburetor and exhaust if you would like.