Description

We’ve seen that more and more over recent years that engine performance / output is heavily controlled by emissions requirements meaning that there is so much more performance available from these engines.  Extracting that performance isn’t that easy but here at LPR we can now offer a performance camshaft that is a direct replacement for the standard cam, giving more lift and duration. This camshaft works with the stock piston and valve train, no modifications required.

The lift of the camshaft was dictated by the maximum lift possible with the standard valve train and the duration was increased slightly to improve performance without significantly impacting the lower end performance characteristics.  It’s a very similar spec to our most popular mid-level camshaft we offer for the single balancer LC4 motor.

The dyno graph shows the before and after torque and power curves on a 2019 Husqvarna 701 Enduro.  The bike was completely stock apart from the exhaust silencer (which was on the bike before and after) and a full custom remap using a Power Commander PCV after the cam install.  Because the cam offers maximum lift with the stock valve train and focusses on optimum duration and overlap limits, we can ensure similar characteristics to the stock cam but with an overall lift in performance.  Cylinder head work and increased throttle body size does yield more top end performance and is what we do with our road racing engines.  Clearly there are so many different variables and ways to improve performance.  Our most powerful normally aspirated road racing LC4 motor is producing just over 90 rear wheel hp and we have a turbo drag racing LC4 with 140 rear wheel hp.  My personal 732cc LC4 adventure bike focusses on usability and reliability in all scenarios and runs around 78 rear wheel hp with a nice usable power curve.  Maximum output numbers are one thing, usability and feel is another and therefore it is important to select the right build for your needs and not just chase numbers.

*Please Note*: KTM/Husqvarna had some recalls and changes in the early years of production of this engine meaning that the auto-decompressor attachment changed.  This camshaft is currently suitable for the latest and most up to date design with the M5x0.5 thread on the balance weight retainers.  All threads in the cam wheel are M5.  If your camshaft has the earlier circlip or M4 threads, please make sure you have the auto-decompression mechanism from the later design or be sure to order the camshaft option with it included.  There are two options, order with or order without the decompression assembly.