37 hp vs 64 hp

[Humber]

Hi, this is to show you the difference between manifolds in "open" and "reduced" EU versions. On the left - a new "open" joint, on the right "a closed" one.

Jetting for 37 hp EU ver is

Main jet 2x 115

PIlot air jet 2 x 135

I can't tell the difference in the cams since I am waiting for them, but sure there is some.

After rejetting and putting new joints, she seems to rev faster but as it is raining cats and dogs, I couldn't figure out the real difference..

[Lucky]

ours (US) look more like the ones on the left