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Welcome to KTM Performance: Commonwealth Motorcycles

Engine Performance

Year Make Model 2017 - 2019 KTM 390 Duke

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KTM PowerWear

The latest generation of the Rekluse automatic clutch featuring EXP and TorqDrive ® technology.  This automatic clutch is installed into the...

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KTM PowerParts

    This Power Commander V comes with plug and play harnesses for the KTM 390's and pre-loaded maps upon request. Unleash Your KTM 390's...


Every Thing you need to do the job right! The First time! Thin head and base gasket set. Sets squish to .95mm, raises compression a full point. Must be used...

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ATTENTION: PLEASE TAKE NOTE OF FITMENT CHART 2015: FITS ALL MODELS 2016 : FITS ALL MODELS BUT USA. USA REQUIRES 90232011010(CLUTCH PACK) FROM...


This is a KTM factory High performance spark plug that fit many bikes but is a great upgrade for the KTM 390 over the stock plug.

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Ceramic engine Bearign Kit fo rthe KTM 390s. This kit Contains 2 Balance shaft Bearings and 4 Transmisson Bearings. Ceramic bearings have many berfits...

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KTM PowerParts

NO LONGER INCLUDES O2 OPTIMIZER. WORKS BEST WITH NEW AKRA MAP ENDING IN 20133 PRE-INTALLED IN ECU!   This Power Commander V comes with plug...


Thin head and base gasket set. Sets squish to .95mm, raises compression a full point. Must be used together.   These Gaskets are made exclusivly...


Mechanical timing chain tensioner supplied with gasket. Replaces your weak stock unit for extra protection on the track or street.

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As Great as the the KTM 390's are, everything can be inproved. The stock shift spring is way to soft, making it easy to miss your gear. This kit made by...

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K&N Air Filters

K&N's high-flow air filters are available as a replacement for your stock motorcycle air filter element. They are custom engineered to fit your specific...

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