The MC21 T.P.S. part number is 04101-KV3-770.

While they have been known to fail, it is extremely uncommon in my experience. The T.P.S. is actually rather expensive new to replace, but I would be very surprised if you sourced some used carbs and they too had a faulty sensor.

Personally, I've come across it probably twice in 15 years.
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Andy.
NSR-WORLD.COM

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