The TZ350 has maybe being kind , Yam 6 in stock form , but when using a bored/stroked TZ250G with reeds/boost ports , and reworked angles its for sure Yam 14.
And that allows fat pipes to make serious power - no reason yours could not have the same , if the A port front wall is re angled.
The RD/TZ series has 102 bore centers , way worse than yours with near the same bore .
We would kill to have 120 , and yes a monoblock can help dramatically - as we have using CPI cylinders on the YPVS / Banshee with only 102 centers.
But fitting anything bigger than just over 120 diameter is brain damage on a YPVS or post classic racebike.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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