by 250_Sprint » Thu Jul 07, 2022 11:58 pm
Apparently the reproduction air filter is too restrictive.
If the engine starts, idles, responds to twist grip input and will respond under load (riding down the street) with no air filter and does none of that WITH the reproduction air filter, there is something wrong with the reproduction air filter.
Try connecting an air filter from a modern day 125cc engine. A lawn mower engine for example could be fitted. It may look ugly, but most experiments do look ugly and unpolished.
Keep us posted.