The small scooters with 10 inch wheels can only go so fast before coming unstable . When I put on a 50mm BBK my TaoTao would zoom but it was like stunt riding as it was more skeery than when I went 160 MPH on a Honda Hurricane ( later renamed CBR ) 100 . The ones with 10s often have a hub for a 13 inch wheel and thus display a faster rate on the speedo . Even Honda motorcycles are not 100 % accurate as CycleGear sells kits to get them more better to being accurate .
Many performance variators have steeper ramps and a larger diameter which can yield 2 to 5 MPH gain in some cases . The clutch springs of 1k , 1.5k and 2k have the clutch engaging at their rated speed above the RPM of stock springs like a stall convertor in a car with an automatic tranny . The torque or contra spring can help with going uphill as lighter variator weights do as well . When you change the springs out you may also need heavier weights to use with stiffer springs . CVT tuning will require some trial and error of testing diff weights and springs until you get it as desired . The HP clutch springs can make the belt wear out a lil faster .
I was looking at a DR Pulley clutch as it comes with spring sets and weights so you can fine tune it more so than others . The cost is several times more , DR Pulley is a well known good name in variator weights so I figured their clutches would be better than OEM ones but I read where a few members had failure . Hoca and NCY are both considered decent brands that are better than stock parts and not as expensive as the Itailian goodies . I am looking at a Stage6 CVT kt as I plan on installing a Stage 6 BBK with matching crank this summer when my outside jobs pick up .
I have read several horro stories where the stock generic belt with some locking up the rear wheel causing a slide and in some cases a wreck . When a belt breaks it takes a while to clean out the dust and broken strands . Remove the CVT cover and see if you have a Gates Powerlink belt like some come with as many have a crapppy generic one that will not hold up or last as long as a Gates or Bando . I got 12,000 miles on my belt in my Echarm and could have went more but I changed it anyways to be safe as I like to do so rather than wait for a failure . I love to wrench like doing service work but it can suck at times when its repairs . Bando is made in Japan instead of China and that is what Hondas use and after doing some research and polling Bando seems to be the best brand . My 2T has a lil over 4,000 miles and still looks like new on the stock Gates belt but will be replaced with a Bando when its time .
You can tune the CVT to improve your speed without touching the engine . You can have lighter weights to help on takeoff and uphill bu ttoo light will loose top end and MPG not to mention over rev the engine . Heavier can have more top end providing the engine is strong enough but really hurt take off and uphill .
I used to think a CVT was wimpy compared to a manual wet clutch tranny until I rode a Polaris Ranger , a 500cc and a 600cc v twin all with a CVT instead of manual shift ( I love a manual clutch but hate a semi auto clutch ) and it really performed well and helped in desending down steep hills as I had over 30,000 acres to ride in a national park . Having a CVT is an advantage of a chain driven moped that has only one gear where the expansion of the belt acts like having gear ratios as it does not have a physical set of gears to shift like a manual tranny does .
Even tuned a 49cc can only do so much and if you put it under too much stress plan on having it wear out faster and damage parts . With a BBK its instantly more power so the engine can hit top speed and not work as hard after upjetting the carb . Installing a BBK may require retuning the CVT as when I had a 49cc engine 5 grams was ok but with a BBK it would redline on level road and I could not push it hard when going downhill as I tried to not let it redline . Stock engine would hit 8,000 and fizzle above that but with a BBK , pipe , upjet and racing CDI it can now hit 10,500 sometimes 11,000 according to the tach . Not my lil scoot is a 2T and it can rev much higher than a 4t but the CVT tuning is similar on both other than a 4T has tranny drag and a 2T coasts .
If you really want a 49cc or larger with a BBK then get a 2T as a tuned 70cc can smoke any small 4T and some 150s . I love to say " Its only a 50 but has an exhaust leak "as my pipe is very loud like a motorcross sound and decibel level and make 4T riders get 2T envy
..BAD TO THE BONE..
