Description
This is an improved Yamaha Moto-4 4WD 1YW-21 ECU Replacement.
What’s better compared to the original unit:
– increased protection against over-voltage (such as a defective voltage regulator/rectifier, bad battery).
– higher resistance against a defective ignition coil and reverse battery connection .
– acceleration correction: when the RPM increases the ignition delay changes (in proportion) resulting in a smoother acceleration.
– digital technique: therefor the unit is more accurate and less sensitive to temperature changes.
– optimized ignition curve/map to improve engine performance resulting in more power.
– spark power control: the unit will change the output to the ignition coil when the battery voltage changes in order to keep the spark power the same.
– start mode: during engine start there’s a start delay and the unit will give more current to the ignition coil for a faster start.
This ECU replacement kit is used in the models below.
Please note that this (small) list is for reference use only.
We do our best to keep this up-to-date:
Yamaha YFM350 Big Bear 4WD CDI
Yamaha Moto-4 4WD CDI
Yamaha YFM350ERT CDI
Yamaha YFM350FWT CDI
Yamaha YFM350ERU CDI
Yamaha YFM350FWU CDI
1987 1988
Numbers:
1YW-21
1YW-85540-21-00
Model: CARI-YA-YFM350-BIG-BEAR-MOTO4-1YW-21 Carmo CDI-set YFM350
000.245.000 S120 45
