Upgrade Kit Increase Power on your Gx340 and Gx390 to 16hp 90mm Bore
This kit includes:
1 x New 90mm Engine Block 1 x New 90mm Piston 1 x New 90mm Ring set 1 x New Piston Pin & Clips 1 x New Connecting Rod 1 x Full Gasket Set 2xOil Seals 1 x Straight Crank Shaft 1" Diameter 1/4" Keyway
Please See Pictures This kit includes everything you will need to do the Power Upgrade and your Engine.
Gx 340 11hp has a bore of 82mm Gx 390 13hp has a bore of 88mm
