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What is an advance unit? What is it for and why is the thing so expensive? Can i not do without? can i modify curves? what curves are there?

Advance units contain characteristics for ignition control, changing the moment of ignition in function of engine speed. For the normal working of many engines (notably 4 strokes) a must.
They can however also be added to 2 strokes, require than however to also replace ignition coil and use different initial settings (other material will stay same)
 
  • Advance units are some kind of dedicated computer. The instructions of the system containing such a unit indicate the needed switch settings. 
  • Customers are NOT encouraged to experiment with other settings as they might bring engine configurations dangerous to man and machine.
  • The advance lines in the unit can not be reprogrammed. We do not offer such Materials for good reason. We are not a partner for engine tuning. Advance control experimentation may well lead to engine configurations which are dangerous for man and material and which may also void legal  roadworthiness 
  • we do not publish lists of all settings as sometimes wanted by customers as this will only give rise to experimentations

  • And, those parts are unfortunately expensive (Info).

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We have different advance units, depending on whether the system has external or internal trigger, is crankshaft or camshaft triggered, uses a magnetic sensor or a hall element.

Units for external triggers need specially formed trigger protrusions on the rotor circumference. Some of our rotor (for 2strokes) have sloped protrusions, which are no good for advance control. Here also rotor would need to be replaced.