One of my current projects.

[gusfixesit]

I am rebuilding a wrecked PowerSports 50(head-on collision). The fork and front shocks were destroyed, as well as the front fairings. The rest of the scooter Is in very good condition. I got interested because not only is it a long frame scooter it also has dual rear shocks, 13-inch shocks (not 11 inch) and 12-inch fancy wheels. Apparently PowerSport scooters were built with a 150-cc frame (I could put a 150cc motor on it without welding or changing any major components. This one was built with a long block 50cc motor which I have been building on.
Big bore kit with large valve head, 19mm carb, blue Cid and orange coil, new starter, 4-gram rollers and new Kevlar belt, new stator and some preliminary tuning.
The motor is revving up to 9750 rpm's using an A9 camshaft, and a home modified exhaust give this scooter a great sound. I am installing a fork and shocks from a Quantum 150 scooter with 13-inch front wheel.

My question is, what is the stock gearing on this motor, I am convinced I'll be able to get a top speed of 70 mph, but I'd like to do the math and know for certain what the top speed will be.
Does anybody know what the gearing is on this motor, I may change it if i see there will be a significant performance gain. But as it stands now it seems this baby is going to kick some serious behind.
 I am going to take some pictures and video of the finished product, which will probably be together by the end of the week, except for a paint job, which, after so much work, i think is mandatory. 
Anyway, i will keep the thread updated with all of my progress. Keep on scooting!💪🛵🏁

[190mech]

49ccscoot.proboards.com/thread/3472/primary-secondary-final-drive-ratio
www.49ccscoot.com/calculators.html

[jackrides]

Best guess is with all the variator variables (5 times fast please) the best way is to prep the scoot, warm it up well and do a top speed run checking the tach.

[gusfixesit]

Almost done replacing the shocks, couldn't figure out how much oil to put in them, so I ventured guess and added 200ml to each. They overflowed, so I am expecting a stiff suspension. That's okay, they are only temporary, until i get an exact replacement.
Had to take a break from it, had to install a tankless water heater, throw out a 25 feet fridge, and replace it with my 15 feet freezer. Worth doing, I gained a lot of extra space for my little lab of doom and invention.
One thing, I did tune the engine a little, and I am reaching 10,000 rpm on it, consistently. I am quite afraid of a floating valve and my piston meeting with it. Those first meetings are always so awkward; and destructive.😮