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CDI Ignition

For Spartamet and Saxonette mopeds

CDI Ignition
This article describes a home-made CDI unit for Spartamet and Saxonette motor-assisted bicycles (mopeds). Although the moped ran fine, at full throttle and at top speed (15 mph) the ignition began to misfire. The fuel consumption at full throttle also increased dramatically. Apparently the ignition starts to skip sparks when the 30 cc two-stroke engine is at full throttle and at top speed. The manufacturer has used this method on purpose to build in an electronic speed limiter to ensure the moped is road legal. However…
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CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

COMPONENT LIST
Resistors
R1= 560Ohm
VR1 = S10K140 varistor
Capacitors
C1 = 1µF 400V MKP
C2 = 68nF 400V MKS
Semiconductors
D1,D2 = 1N4007
D3 = BY329
DI1 = diac D30 (alternative: ER900 or DB3)
T1 = TIC126N
Miecellaneous
3 pcs 6.3-mm (0.25'') Fast-on (spade) terminal plugs, PCB mount
PCB 120601-1, see [1]
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