2-Stroke Services

Porting is a metal machining operation designed to enhance the powerband characteristics of an engine, especially with aftermarket bolt-on accessories like exhaust and intake products, stroker crankshafts, big bore kits, and ignitions.

Eric Gorr Racing offers all-inclusive porting packages for all types of 2-stroke and 4-stroke engines used in dirt bikes, ATVs, snowmobiles, and shifter karts. Eric Gorr does all the porting himself and has worked with porting tools since the early 1970s and ported over 50,000 cylinders. More than all the other popular hop-up shops combined.

Eric is well trained in the use of the latest software programs that the motorcycle manufacturers and racing teams use, like the ones available from Professor Gordon Blair. these programs are the standard in state-of-the-art design of championship winning motorcycle engines and recognized by the Society of Automotive Engines and used by the world’s top universities. Eric Gorr Racing is a Gold sponsor of the University of Wisconsin (Madison) Formula SAE Team.

Eric uses modern computer design software to do the number crunching needed to reconfigure cylinder ports to enhance the powerband to the way you want it to be. Eric is the only tuner in motorcycle racing with two US Patents US4261306, US4457267, a published SAE technical paper, and six motorcycle books to his credit.

Eric made his reputation on porting and does all the work himself, no illegal aliens, space aliens, or third world slave labor. It’s just middle-aged fart-knocker labor from one of the oldest and most experienced tuners in the world, whom still actually rides motocross, dirt track, trials, and supermoto.

Cylinder porting can improve the reliability and ride-ability of your bike, and all the top end parts need to be modified as a set like in these package deals.