Scooterworks USA, LLC

Engine Cases (Pair, Long, Big Bore, Custom); GY6

SKU 1100-1418
$172.00 Sold out
Shipping calculated at checkout.
Scooterworks Exclusive Custom Big Bore Engine Cases for GY6 150 Long Engine. We machine these in matched pairs ourselves! They are bored to fit up to a 63mm Performance Cylinder Kit. Go big.

Cases are matched Right side and Left side, and stamped with a serial number to make sure you have a perfectly matched set.

Check out the following Cylinder Kits that will work with these cases on a GY6 150 Engine:

57.4mm Cast Iron
59mm Cast Iron
61mm Cast Iron
63mm Cast Iron
58.5mm Ceramic
61mm Ceramic
62mm Ceramic

Pick up a new crankcase gasket to go with your new, big bore cases.

Special Bore (Sold in Matched Pair)

Not legal for use in California on pollution controlled vehicles. Check local laws before installing.

This product is not intended for use on public roads or land.

  • Same day shipping for orders placed before 2PM (CST) M-F
  • 30-day return period
  • Flat-rate shipping for orders shipped to the 48 Contiguous United States.
Since 1989

Supplying parts and accessories for vintage and modern scooters since 1989 – Over Half a Million Served and Counting!

Comprehensive Resource

From wear-and-tear items like tires and oil filters to aftermarket parts from industry-leading brands.

Dealer Focused

With a committed team of dealer-focused sales reps and streamlined pricing and shipping processes, we are dedicated to supporting your business.


Our team constantly strives to develop and source the best new products for your scooter.