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SSP-G Boring Tool (QMB, QMF, GY6)

Description: A must for using most large bore cylinder kits beyond factory, especially installing a GY6 cylinder kit larger than 61mm requires the factory crankcase to be machined. That is why we offer SSP-G Engine Case Boring Tool which allows a bore-cut to fit cylinder size 61mm for 171cc, 63mm for 180cc or even whopping 63mm for 205cc with extended stroker displacement on a 54mm stud GY6 engine (crankcase). Will also work on 139QMB crankcase bore up to 52.4mm.

Note: The supplied hardware is for GY6 engines utilizing an M8x1.25-cylinder stud. Other engine applications will require different hardware not included with this kit. The cutting bit and adjustment allen bolt may need to be shortened to work with smaller displacement engines.


Includes the following power-drill attachable Bore tool, Bore bit, allen wrench, studs, nuts, and SSP-G Sticker.

•    Bore bit (blade)
•    Bore tool (bore upto 67mm MAX.)
•    Fit 50mm Stud Spacing /Diagonal 70.5mm (139QMB bore upto 52.4mm)
•    Fit 54mm Stud Spacing /Diagonal 76mm (A-Block, bore upto 63mm)
•    Fit GY6 125/150cc+

•    Fit QMB 49/50cc+

Supported Models: GY6 40QMB 50cc 2-stroke, 139QMB 49cc-50cc 4-stroke, 50QMF 90cc-100cc, 152QMI 125cc, 157QMJ 150cc, Chinese Scooter, ATV, Genuine Buddy, Kymco, Ruckus, Vento
Item Weight & Package Dimensions:
•   4.4 Pounds | 5.8" (L) x 5.2" (W) x 4.6" (H)

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SSP-G Boring Tool (QMB, QMF, GY6)
  • Availability: 18
  • Brand SSP-G
  • Reward Points: 5
  • Model: 202-37
  • Weight: 4.40lb
  • SKU: 202-37
Products Sold: 0
Product Views: 2455
Price in reward points: 142