Free manual:
Apparently under the footboard:
https://www.manualslib.com/manual/597202/Yamaha-Bws-Yw100e.html?page=46
https://www.manualslib.com/manual/597202/Yamaha-Bws-Yw100e.html
YAMAHA BWS YW100E Owner Manual
SOURCE: I have a 100cc 2 stroke quad I think its a Adly
check for external air intake leak between the inlet boot and head. it sounds like you are experiencing a "lean" condition in the fuel system.
SOURCE: When changing my 50 cc scooter to a 100cc scooter will my stock crank shaft workor must I change it
how are you doing the change
just boring the cylinder out and fitting oversized piston
fitting a bigger cylinder and piston
Ypu have to give more details as to what you are doing
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