https://www.vhm.nl/AA33204
In this video we test a Sherco 250SE-R with VHM cylinder head and insert compared to standard. Near the end of the video you can see a dyno graph of the test.
VHM parts used in this video:
Cylinder head https://www.vhm.nl/AA33204
Insert https://www.vhm.nl/AE32329-E
00:17 Warming up the engine
00:28 Making several dyno runs