Call Us: 775.309.4956
 
 

 

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Welcome to Thumper Racing

 
 

AT THIS TIME THUMPER RACING IS BOOKED SOLID WITH ENGINE BUILDS.  WE WILL NOT BE ACCEPTING NEW ENGINES UNTIL JUNE.

ALL PARTS ORDERS, PIECE WORK, BIG BORE KITS AND THE WEBSITE ARE NOT AFFECTED.


THANK YOU FOR YOUR BUSINESS!


DON'T GET US WRONG - WE LOVE THE INTERNET, BUT WE WOULD RATHER WORK ON BIKES. 

THIS WEBSITE IS JUST A GUIDELINE FOR WHAT WE OFFER. 

PLEASE EMAIL OR CALL IF YOU DON'T SEE THE PRODUCT OR SERVICE YOU'RE LOOKING FOR ON THE SITE. 

Email:  info@thumperracing.net   Phone:  (775) 309-4956  Fax:  (775) 996-4333

We always help if we can, but technicians are not always available during the day, the best way to reach a tech is through email, tech@thumperracing.net.

MONDAY- FRIDAY 9am-5pm PST Evening or weekend hours by appointment.   

We've been in the the Big Bore Four Stroke industry for awhile now and have seen them come and go. Our kits and components have all undergone extensive torture tests in the real world with real customers, real racing, real endurance riding, and we have fed that back into our kits

You can experiment yourself on your expensive thumper four stroke, but when you want Big Bore Power that "Just Works" and won't leave you stranded, make your ride impossible to start, or give you power that's unpredictable and "peaky", give us a call.

We are under heavy development for packing more power into smaller motors, like our KTM 250+ big bore kit, which pumps up your motor to a 320cc screamer, but with more power comes the need for more cooling, so we re-designed the cylinder kit to get 15-40% more cooling for a more stable core cylinder temperature.

 

 

Latest Article

» KTM 600 XC

No rider who has ever thrown a leg over KTM’s 525XC can call it slow— and if they have, they might need to take some time off for a mental rebuild. Stock, it will outrun just about any other sport quad on the market today, save for KTM’s own 505SX. The singleoverhead- cam, four-valve RFS Racing Four-Stroke) engine spent a good amount of time in KTM’s off-road motorcycles, achieving a level of refinement and performance we came to value when testing the biggest Katoom. In stock form, the 525XC is an open-class fighter—tons of power, comfortable Ohlins suspension, a lightweight chromoly frame and a whole...

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