hey guys, please .....
mayhem madness, check your internal 3 speed clutch, it might be worn or something.
read your manual. multi speed tranny have it adjustment point according to your need.
for speed number 3, you must lean your engine enough to get power of last shifting.

OR, your one way bearing in the tranny broken (like mine ... last time).

That's why i never want to deal to 2 or 3 speed anymore. they kinda complicated to set and maintain also.

hope this could help