I know the short answer is I need to get a tachometer to really know, but current performance has me wondering whether I am a candidate for a 20 tooth clutch.
Now on stock 21/68 gearing. GPS has me doing about 50 mph in 2nd gear, 60 mph in 3rd gear, and 70 mph in 4th gear. Online gearing calculators have me doing about 8,800 rpm in 3rd and 7,700 rpm in 4th, but I am suspicious of those numbers because the calculators also have me doing over 10,000 rpm in 2nd, which seems doubtful for a cast iron Malossi 177. On the other hand, Cd for these scooters must be dreadful, so who knows what I'm really turning at speeds where Cd is not such a factor?
Leaving the calculators aside, 50 mph in 2nd seems like a waste. The usual 22 tooth clutch mod would only make that worse. I wouldn't mind trading some top speed in 2nd if it meant more rpms and more top speed in 3rd and 4th.
Thoughts?