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Help with building your Speeduino, installing it, getting it to run etc.
By LAV1000
Install might need a ground wire between cilinder head and ignition coil.
How are battery, speeduino, frame, and engine grounded ?
When an engine is mounted into a frame it is not guaranteed it does have good ground connections :(

Looking at the sync losses compared to the cranksensor signal, could it be related to an ignition or injection event ?
ULN2803 output random cutout

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