Sales & Tech


We offer professional dyno-tuning and diagnostics, as well as performance upgrades and factory recommended services on Harley-Davidson and American V-Twin Motorcycles.

Dyno Tuning
Custom Engine Building and Performance Upgrades
Factory Recommended Services
Warranty Repairs
Insurance Work


Dyno Tuning

Does your Fuel Injected or Carbureted bike have any of these symptoms?
  • Surge at steady speed
  • Hesitation
  • Poor fuel economy
  • Lack of power
  • Spark knock or "ping"
  • Backfiring

We can fix it!

We use a state of the art DynoJet 250i dyno and 30 years of Automotive and Motorcycle engine management systems experience to expertly diagnose and tune your motorcycle to make it run the best it can.

We have years of experience with the TTS MasterTune, PowerCommander, Race Tuner and Super Tuner EFI tuning systems.

Custom Engine Building and Performance Upgrades

We offer full service engine building and performance upgrades using only tested parts and components from reputable manufactures. We have tried and true combinations, but everybody's budget is different so we custom tailor every package to your personal budget and needs. No matter the level of modification, engines components MUST be matched in order to provide a fast reliable motor. Few shops do this and we are one of the best at it. We will be happy to offer advice even if you're doing the work yourself.

Factory Recommended Services

We do all of the services recommended by the factory to keep your bike running at tip top shape. Click here for a list of recommend services and prices

Warranty Repairs

Got an extended warranty on your bike? You are not obligated (by law) to have the dealer perform the repairs. We deal with the factory's warranty insurance company as well as many others to get your bike repaired and back on the road as soon as possible.

If your bike is broken you want it back as quickly as possible. We offer a quick turnaround time so you miss as little of your riding time as possible.

Insurance Repairs

In the unfortunate event that you are in an accident, we will make sure that your bike's recovery is as painless as possible.

DonSPEED/Horsepower Sales Div.
3319 Fitzgerald Road Suite #12, Rancho Cordova, CA 95742
Tel: (916) 853-9738