Rocket Sprocket BMW Camshaft Sprocket Installation Guide
Rocket sprockets are precision CNC machined cam sprockets designed to advance the cam timing 9 degrees on BMW Boxer R259 and K25 series single cam engines from the R850 through up to the R1200. The timing advance moves the engines peak torque between 800 to 1000 rpm lower dependant on the model whilst maintaining the existing profile. This places peak engine torque within a rev range more usable in day to day riding and markedly improves engine responsiveness at low to medium revs.
Prior to installing the sprockets:
1. Print a copy of this guide.
2. Read the summary and the complete step-by-step guide until you are sure you understand it. The summary is an overview of the steps at the high level and the steps provide specifics.
The guide will repeat itself so that you do not have to go back to re-read important sections while you are doing the job.
The installation process is the same for each cylinder with the exception of the removal of the throttle body on the left hand side because the cam chain tensioner is more difficult to access with its positioning behind the throttle body.
Download the full instructions: