Yamaha first introduced the YFM225s Moto4 in 1986. This was an upgrade model from the YFM200DXS. The 225 not only had more power but also a dual range transmission, dual headlights, speedometer, trip meter, and was a larger machine all the way around.
The cylinder and head used the same basic overhead cam configuration that Yamaha introduced into the 200cc four stroke motorcycles starting in 1980. Below is listed the model numbers and corresponding years.
1986 YFM225S
1987 YFM225T
1988 YFM225U
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Thanks for the excellent coverage mate!👏🏼 I just bought my first 1988 moto 4 and looking forward to a complete restore👍🏻 This will help 🙏🏼
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