Uh oh, its another makemybatfast post.
Just put a new mlm pipe and a dellorto SHA 15.5 on my batavus starflight hs (top tank) (30mph m48)
Tried upjetting, doing timing etc, double checked for air leaks, and the thing still tops out at 25 and has a horrible low end - if anything the powerband is worse than it was. The only thing I wasn't able to get to change was the reeds (mlm reed block didn't fit somehow) so I'm running the stock reeds.
The belt is still super old and squeaks a bunch when it takes off - could a new belt affect performance?
Any ideas? Many thanks - I really appreciate it!