Athena 170cc questions
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Pinned valve doesn't perform well.
I'd put the standard carb back on and see how it runs with rejetting. I converted my 125r to 200cc. I run a tm34ss carb . And my dt200wr has the standard tm30ss (almost identical to the tmx30) both are good carbs for the bikes.
I did run a tm32 which never ran that well -
@jackreece show a picture with your tm32 installed. The float bowl needs to be pretty level. Because of how the DT engine and intake is, some carbs will sit at a angle