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Here is another www.chinesescooterreference.com/pdf/50_150cc_gy6_shop_manual.pdf

If the stator is bad it will not put out enough juice to charge the battery . Here is an example of spiked tires www.savatech.eu/tyres/scooter/winter.html Since it is cold up there I would get a trickle battery charger . Cold temps drain batteries and the only have a few amps , so any loss is noticeable . Battery Tender is one of the best brands . I use a 5 dollar one from Harbor Freight . It works but I do not like how it lacks having a meter .

Check the battery first . A bad cell can make a click sound when u try to start it . I would charge up the battery or take it to any auto part store as they test em for free and most charge for free . Check all the wires for a loose connection . Is this a new issue ?

Geo49 have you made any mods at all to your scoot ? When I bought my 2T first thing I replaced the 68MJ with a 75MJ and replaced the standard NGK with the iridium one . It would always hit 45 MPH ( on the speedo ) and sometimes 50 . It would max out at 8k RPMS while riding . On the CS I revved it up just for a fraction of second to see if it would go beyond 8K . If I went down hill and if it went above 8K RPMs it would stall and fizzle .

I decided to get a racing CDI that did not have a rev limit . No diff at all on top end with the same 8K limitation . My dealer said maybe I should try lighter rollers . I removed and weighed them to be a starting point . They were 6G . I tried some 4Gs but it over revved on takeoff and lost top end . I mixed them up to equal 5G and it was a hair better on take off with as much top end loss as with 4G . Hitting 45 is quite good as many modded 4ts can not go that fast . Here is two links on derestricting and tuning www.scootnfast.com/scooter/Tuning_mods/De-Restricting.htm and www.provoscooter.com/tuning

I pulled off the 49cc engine and noticed the exhaust port was D shaped instead of being fully ported out like the BBK is with a O shaped exhaust port . I had read a great 2T exhaust thread by Brent " The 2T God " and noted that he said many stock pipes are limited to 8,500 RPMs , sport pipes around 10,500 and the expensive pipes 14k and up . I had bought a PM Tuning racing pipe that I first tried to fit on the 49cc engine but I could not get it lined up . With the BBK it lined up the first try . The exhaust places a more important factor on a 2T than a 4T . I had a Honda CR 125 that wasa beast and one day a buddy accidentally spun a rock into my pipe and busted it . Man it killed the power big time . I had a buddy weld it up but it blew out the weld as the metal was no good . A new pipe and it was a wheelie machine again . The PMT pipe I lost bottom end since it was unrestricted which did allow for backpressue to build up . Midrange and top end it was a screamer . I replaced the PMT with the stock pipe and it had more bottom and midrange and was much quieter . The stock pipe has a reed valve just before the expansion chamber than released exhaust at 8k RPMs back into the airbox . I had already removed the airbox to use a Uni . I first ran it with the reed valve uncapped . I noticed it got louder at 8K and the powerband dropped a hair . For now it is taped up but I will do a permanent cap off soon .

When it was stock is was not a fast off the line like a buddies Honda Elite but I would smoke him at midrange and top end with ease . Once I got going past 45 MPH it was screaming , even uphill with a running start I got hit 10,500 RPMs and not able to push it hard down hill . I will have to get some taller gears so I can cruise at 45 or more without having it scream and guzzle up gas . I did put in 8g sliders since I figured it would lower the RPMs compared to the 5g rollers . I put in 1.5k Hoca clutch springs to help on takeoff . With the PMT pipe is was not as peppy on takeoff but with the stock pipe I can make it jump even with heavy weights and 13 wheels instead of 10s .

You can also try a larger diameter variator as I will be doing myself . The larger diameter and steeper ramps can often help on the top end .

Mine also gotten faster after 1,000 miles since the piston moved easier than when it was tighter when new .

To truly get more power a BBK is a for sure improvement . Since it is newsih I would enjoy the 50cc engine and do the BBK later on

You do know that with a Uni you can not ride in the rain and will need to upjet ? I first had a small Uni vent cover around half as big and the proper red Uni I later bought . The engine was the stock 49cc and pipe . I had replaced the 68 MJ with a 75 MJ and replaced it with a 90MJ to match up with the Uni mod . I can hear the air being sucked it much more louder than with the air box . I did notice more pep on take off and midrange and it was the same on top end . Well I bought the proper Uni , my dealer nor did any of the many scooter and motorcycle shops in town have any jets in my size larger than a . Being impatient I put it on anyways . I forgot to oil the filter . It idled fine and barely had a bog when I gave it throttle but nothing close like it wanted to stall . I went down the street and $#^&#&#*#*&#*&# it seized on me . It was 96 degrees outside too . I came home and pulled the plug and it melted the prong to the electrode . With over 30 years of small engines and automotive wrenching I had never saw a plug melt together .

I would buy a jet kit BEFORE installing the Uni to avoid my mistake I made by being impatient . Plan on testing a few sizes out in order to dial it in . A Uni can allow more air intake but with a stock head on a 4T and stock exhaust it may bottle neck . Is this for a 2T or 4T engine ? This is under the 2T section and I only know of OKO carbs for 4Ts . Make sure to oil that filter instead of running it dry like I did !!!

Drain out the gas in the tank . My 2T when it was new ran like a champ . Well one night I bought some gas from a shady place and the next morning it would not start up . It always starts up instantly . I first checked the sparkplug wire and then for fire since I knew I had a full tank of gas as well as good compression . I called my dealer before going too far as it was under warranty . They told me about a scooter with the same no start issue after it had been running good . He said they drained the tank and carb bowl and it had water in the gas . Refilled with ethanol free gas and tada it was good again . I bought a siphon pump from Harbor Freight and did the same thing to mine . I was thrilled it started right up like the other scoot did . I try to only get gas from trusted sources but sometimes I have no choice sine the tank is so small I fill it up for 2.50 of premium . I have had it happen two more times but I only drained the carb bowl and it fired right up .

So I would try draining out the gas and refilling with good gas and see what happens .

After seeing a few on here and two in town with a 2T pipe on a 4T engine a buddy wants to test to see if my pipe will work on his scoot after he gets a jet kit