[Electrical] CDI Ignition Timing

Discussion in '4-Stroke Engines' started by rananthan3, Jul 13, 2015.

  1. rananthan3

    rananthan3 New Member

    I have a Huasheng 142F 49cc engine with CDI. The question I have is what kind of CDI is it. Does it advance the spark timing with engine rpm i.e have a curve? What is the procedure for adjusting the timing?

    I have read online that the easiest way to tune the ignition timing is by making marks on the flywheel to indicate TDC and an appropriate mark on something stationary. Then use a timing light to determine whether you have the appropriate number of degrees before top dead center (BTDC).

    The only solution I have come across is using an offset key for fine tuning. It seems like the position of the flywheel is fixed based on where the keyway is relative to TDC. The article below has a good explanation. On our forum there is a good solution too. If the key is too thin, obviously that will be disastrous.



    Here is an excellent explanation of CDIs on this forum:


    Here is the CDI for the Huasheng engine:


  2. rananthan3

    rananthan3 New Member

  3. rananthan3

    rananthan3 New Member