24 Roy St, #422, Seattle, WA  98109

Ph: 360.474.7472


Dyno Tuning

Engine Management and Data

Engine Building

Repair & Maintenance

Our CycleDyn Superflow dyno and test cell has been hard at work tuning the motorcycles of the fastest racers in the Northwest for almost ten years including current two time WMRRA #1 plate holder, Ryan 'Chromie' Sutton.


SBKUNDG's lead tech, Mike Castro, has formerly completed the Ducati MasterTech program including the dyno specific curriculum administered at DynoJet's facility in Las Vegas.


Our advanced data collection tools and proprietary computational methods ensure a very high quality tune with the least wear and tear on the motorcycle by attacking the fuel management tables as a whole rather than cell by cell.


We can accommodate all makes and models of sport bike and most electronics combinations. Please call or email for details.

2015 Yamaha R1M break-in. 180HP!

In addition to the off the shelf piggy back ECU products from DynoJet, Bazzaz, RapidBike, etc. We have the ability to program most stand alone kit or racing ECUs as well as reflashing stock ECUs for offroad competition.


If you need an integrated data package, we can help there as well.  We have designed and installed many data systems and sensor arrays on a variety of motorcycles. Our test methodology will provide the rider with the ability to maximize the benefit per lap with even a basic system.



Whether you are interested in an overbored street sleeper or a track record capable lap scorcher, we can tailor your engine build to your specific needs. Contact us at your convenience for a quote.


Our small team and exceptional parts vendors, ensure that turn around time is fast and the final product is consistent and reliable.


For competition engines, we will consult with the racer regarding the limits and specification of the governing rulebook to make the best use of your racing budget as well as projecting and scheduling service intervals.


We are currently active in the following race series:


WMRRA    OMRRA    AFM   WERAWest  MotoAmerica


In addition to our racing enterprise we also do basic repair and maintenance at our conveniently located Auburn, WA garage.


- Oil and filter

- Chain and sprockets

- Valve check and adjust

- Tire fitting

- Fluid change and brake/clutch bleed

- 25 point inspection (no charge)


Our shop labor rate is a competitive $95/hr for walk-ins and $89/hr for scheduled appointments. Bring in your race license, military ID or riding club affiliation card for additional savings on scheduled labor.


(Club not on our roster? Contact us to find out how your club can join SUPERBIKE UNDERGROUND.)