Engine Rebuilds by JK Tuning & Race Development This is a KTM LC4 640 motor having just received the treatment and having a number of slow parts removed and replaced with only the finest of parts. This particular motor has had a head gas flow, the standard cast piston replaced with a JE forged item of a higher compression ratio, and a solid billet camshaft of greater lift and duration. As this motor is to be used mainly on the street, care and attention will be taken to create a mild mannered power delivery with a wilder side that can be called upon when the back roads will allow! The KTM is becoming one of our favorites as, although the motor is generally well made, they can be developed to produce far better power than in standard form at almost no expence of reliability. Email us for a free quote or advice. Back to Products & Services Back to Home