The Original - designed and listed since 2013

New Vxper Opti MOD 36mm Piston 

Featuring - NEW Optimised Booster Port and Further Lightened Piston Wall by Internal Milling ( requested by my customers as they had to spend the whole nite with a dremel to thin down the piston walls )

Drop this piston into your Stock 28.5 or 29.5 or 30.5 cc Zenoah G290PUM or even Zenoah Clones and see it turns into a SPEED MONSTER.

Feedback from buyers - they swapped the pistons with their boat in its original settings - it leap out of water due to the surge in power at full throttle. After adjusting the strut angle, the new power surge is converted to pure speed.

Look at my Feedback from buyers - ONLY HAPPY COOKIES. 

Can be used on MOD engines provided the exhaust ports and intake ports are not enlarge too wide. 

Precision machining - using CNC turning & milling 

Weight - 22 +/- 0.5 gm 

Top end diameter turned down to avoid piston seizure as your engine will be running beyond manufacturers' initial rpm and operating temperature.

Consist of

1X Vxper Opti MOD Piston 36mm Diameter

Consider my MOD Lightened Piston Pin, High Speed Needle Bearings, G Clips for convenience, Anti Drag Ring for Rear Oil Seal near Flywheel, 3rd Bearing to replace the Front Oil Seal, Anti Blow Out Seal, Full Circle Crank for Reduced Crankcase Volume ( available in 28mm and +2mm Long Stroke )