What is difference between a baotian 50cc and a 125cc

http://chineseatvmanuals.com/service-and-repair-manuals-50cc-70cc-90cc-110cc-125cc-chinese-atv-service-repair-manuals-p-148.html

I did not see a manual at the Coolster web site, but it reportedly has parts for some models.

https://coolster.com/


50cc 125cc Chinese Atv Repair Manual Set Om 110set Service and Repair...

Hello. personally I will recommend 35mm AIR FILTER for Chinese made 50cc, 70cc, 90cc, 100cc, 110cc, 125cc Kids Taotao ATV, GO-KART, POCKET BIKE, DIRT BIKE

Back flow pressure and heat transfer are what make the motor work most efficiently. There is a reason that the pipes are different sizes and shapes.

a 50cc is the cubic bore as is a 125 cc the size of the piston .so it should take of the cover but it must be for same number of cylinders

Peace Industry Group is the importer -- www.peaceindustrygroup.com or www.peacesports.com under manuals. ZIP file says 125cc, but it is for 50cc, 125cc, and 150cc, same model. Here is the link to the download. It's safe. just a collection of .jpg images of each double page.
http://peacesports.com/manuals/TPGS811-125.zip

Open weblink. There some Information about BT49QT-9R scooter
http://www.baotianscooters.co.uk/baotian-bt49qt-9.php