Does not require changes on crankcase. The system is technically capable of running without battery.

• all parts are new
• solid state ignition and advance
• more light output (with light bulb 40/45W)
• very stable ignition with solid spark
• better starting, better fuel burning
• no wear anymore on collector, govenor and points

Important advice: The R27 is originally provided with a battery ignition, now it is a magnet ignition system. There is a an advantage, but there is also a drawback and important difference. To start you need about 300 revs on the crankshaft which means you will have to kickstart rather speedily. A slow kick will not start this system. 
Unfortunately the R27 has a pitiful kickstarter mechanism.

• assembly instructions
• wiring diagram of the new system
• parts in the pack

• engine block with the system
• the new stator
• stator during assembly
• ignition timing
• wire exit

• fastening of the new ignition coil by using of a (self-made) bracket
• fastening of the advance unit and regulator by using of a (self-made) bracket
• the simplest solution: regulator and advance unit in an empty battery housing
• all fits under the cover