Difference between 25 mph and 30 mph minarrelli v1

Tim H /
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I just picked up an AMF Roadmaster with a v1 on it, and I'm pretty sure it's the 25 mph version. I haven't gotten it up higher than that, even on flats. It runs well and everything, so my best guess is that it's the 25 and not the 30.

I've been looking through the manual online in an effort to find out exactly what the difference is. The carbs are the same (14/12). So far I've been able to identify the following differences:

(Part: 25/30)

Sprocket: 10 teeth/11 teeth

The rings may be different as well: 38.7mm/38.8

These were the only things I could find in the manual that vary between the two models. Is there anyone out there who is knowledgeable about this? Could I upgrade to the 30 mph engine by swapping out some parts, or would it require me to physically alter the parts that I have now? It seems like the sprocket should be pretty doable, but I know that I might take a hit on my acceleration. Any suggestions are welcome. Thanks a lot!

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