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Welcome to KTM Performance: Commonwealth Motorcycles

Engine Performance

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


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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Year Make Model 2017 - 2019 KTM 390 Duke

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