TA21 and TA22 carbs are different. TA21 can be made to work, but it's not just as simple as swapping jets, as the internal galleries are different.

The differences are very small, but under the right conditions can make a significant difference.

My advice would be to souce some TA22s. Play with the TA21s as and when you feel you know the fuelling and air correction characteristics better.
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Andy.
NSR-WORLD.COM

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