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Welcome to KTM Performance: Commonwealth Motorcycles

Engine Performance

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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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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Year Make Model 2017 - 2019 KTM 390 Duke

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

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