Description : Image result for turn light on

I noticed that many people dont understand the key importance of the Pickup position BTDC
They try to set random value or even zero degree BTDC.!
Let me tell you this speaking analogy:

Imagine you (the cdi) have to turn the light on (ignite the spark) every day (every engine cycle).

Depending on random weather condition (rpm) you have to turn the light on early at 8am or later at noon (tdc).

If you want to be able to switch the light early or late, you MUST set your alarm clock (pickup) BEFORE the sooner moment: Before 8am. (Say at 7 or 7.30am)

This way you (the cdi) are wake up and can turn the light (spark) on,
at 8am (lot of advance)
or wait until noon (tdc) (no advance)
every days (every engine rotation) depending on the changing weather (rpm).

In simple words:
If the maximum advance is 35degree, the pickup is inevitably fixed at 35BTDC or a bit more!

 

 

/!\ If you set your alarm clock (pickup) at noon (O degree BTDC) , youll wake up at noon (tdc) and only be able to turn the light on late at noon (tdc) but not at 8am. Too late!!!

=> The old ignition systems (MAGNETO or FIXED POINTS) from the 1900s work this way without any ADVANCE.

=> The only workaround is: If you woke up late (at noon) (tdc) you have to wait 24hours (an complete engine cycle) to turn the light (spark) on the day AFTER at 8am.
Ignition systems that allow a 360degrees shift are very rare!