I've discovered lots of things on mine. I am in the beginning stages of restoring a 1954 SH Stage II.
I do have an 'H' for comparison but thats as close as I can get.
Mainly the 45 'H' has a c152 engine but the 54 'SH' has a c164 and about 8 to 10 (roughly)more horse power with using the over bore kit.
The carb is larger than the 45 'H' and oddly enough my governor is a little unique as well. The spring and linkage is a little different.
Transmission gearing in the 'SH' is slightly higher in 3-4-5. The 45'H' always whined horribly in road gear but the 54 'SH' always felt more solid and ran silent in any gear.
Live Hydraulics was already mentioned and of course the 'SH' has disk breaks.
The 'SH' was always much more torque'y than a standard 'H' all the way around. Although you can almost match the horse power of an 'M' but the 'M' always felt beefy'r and will out pull a SH
The most noticeable tell tale sign is the battery was moved under the seat and the hydraulic reservoir/valve is under the fuel tank.
A different fuel tank and new wrinkle in the front hood that about does it. Everything else is nicely interchangeable.
Below is a link to a couple photo's. This has been quite the adventure too. I hope to have at least a running engine before summer is out. From there I will finish off all the other odd things and then finally color it the next year.
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