• $699.00
    Unit price per 

GUARANTEE FIT FOR TWISTER HAMMERHEAD WITH INTERNAL REVERSE ENGINE.  Call our technicians if you have any questions 434-447-4870

We can also convert this same engine for racing by giving it more horsepower. We can convert this 150cc engine into a 175cc racing engine for your vehicle:


Read our article on how displacement relates to more power.
How big bore kits & strokers work

To see more on converting this new engine to a 175cc or 184cc racing engine please see:

175CC racing Engine


Engine is shipped DRY with no oil. Be sure to add 750ml of 10w40 to the crankcase and 120ml of 80w90 to the gearcase before starting.


No returns on engines.  Please call and speak with our technicians to ensure that you 100% get the correct engine.  Please do not return your engine. In the very rare event that there is a warranty issue please see warranty section. 

What's included:
Everything under the engine's covers and plastics is included and installed, this is a complete unit. Starter, stator, and intake manifold arrive bolted to engine. CVT transmission is fully assembled and cover installed. All transmission components are assembled and cover installed. All drain bolts and internal oil screen are installed. Valve cover installed.

Sold separately:
Carburetor, exhaust, ignition components are all sold separately.

Remember to adjust valves after break-in period..

b]About Oil Coolers:[/b]
Our engines do NOT come with provisions for oil coolers. We've always advised strongly against the use of oil coolers on the GY6, and we do not offer them on our engines.  We've seen too many instances where a cooler line bolt vibrated loose, dumping all of the engine oil and causing a massive failure. The perceived benefit isn't worth the risk. Oil coolers on the GY6 solve a problem that doesn't exist. Follow regular maintenance intervals, invest in a UNI Air filter (and keep it oiled), and your new engine will last many years. Coolers provide a false sense of longevity benefits, and the only proven result is the added risk of unexpected massive failure.