175cc GY6 Scooter Racing Engine (Long Case) with Performance Transmission

In stock
Regular price $1,099.99


175cc Racing Comes with Performance Transmission for Better Power Transfer to the Wheels:

Our BDX High Performance Racing engine is the only new 175cc GY6 Scooter engine sold or manufactured in the USA.  We bore out the case and install a 62mm big bore cylinder and piston and rings in your new engine.

With our 175cc BDX racing engine you'll have the power that you need to have your scooter on the highway with fast driving cars.  It also comes with our BDX high performance transmission which includes the following:

You will not find this engine anywhere else.

Don't be fooled by others selling the 61mm 169cc or 172cc engines with stock transmissions, no boring, and no testing.  The 61mm cylinder has a thinner wall unlike the 62mm cylinder.  We bore the case, in our facility in the USA, to make room for our thicker walled 62mm cylinder.  The case is bored out, on our 5000 pound metal lathe to accept the larger thicker wall 62mm cylinder.  Others selling the 61mm are being lazy and not doing the hard work to get you the power and reliability that you deserve.  And below are the results that you get with the thin wall 61mm big bore kit.


Read our article on how displacement relates to more power.

How big bore kits & strokers work




Frequently asked questions are answered here.

[*] 60 Day Parts Warranty
Please read the Warranty details in the right-side column.

No returns on engines.

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.

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 and charging parts are all sold separately.

Remember to adjust valves after break-in period.