Boxerworks.com

I recently installed the Silent hektik kit on my 79 R80 engine. The engine came from a weird mix of bikes, so i was not sure of the flywheel, with the S marking being at 6 or 9 degrees BTDC (https://bmwmotorcycletech.info/flywheel ... lletin.jpg)

- So i put the bike at TDC, I put on the timing disk directly on the crank with the rotorbolt. Made a fixpoint at 0 degrees.
- Turned the engine counterclockwise, till i had the engine at 6 degrees at my fixpoint. I made a white dot mark on the flywheel - somewhere between the OT and S marks, so i suppose its a pre-'77 flywheel i have.
- Bolted on the new rotor with the trailing edge the rotor-"lip"at the sensor edge.
- Started the engine (started somewhat easily, compared to sitting still for ?? years)
- Checked the timinghole with a timingstrobe light, with idle right at the S mark and the 6 degree dot in the top of the timing hole.

So is this correct?

Look on the edge of the timing hole in the crankcase. There will probably be a groove. This is the accurate timing mark set when the engine was produced in the factory. This is the mark that should align with whichever timing mark you are using.

I have to ask about your 'Fixpoint'. The OT mark on the flywheel denotes TDC and, if your 'fixpoint' does not agree with that then either your determination of TDC (0 degrees) is out or there is something out radically out of place in the engine...

Rob

The SH kit manual describes the rotor to be installed 6 degree BTDC as a standard.