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"would it go faster if i put a bigger cog on the back wheel"
no, you need a smaller "cog" or sprocket on the back wheel to up the speed, but your still only looking at a 3% gain in top end speed. try a larger sprocket on the front eg. if you have a 15 tooth sprocket change it for a 16 or 17 tooth. this should give you up to about 10 to 15% gain at most.
if you want a bit more then you'll need to look in to rejetting the carb, free flow airfilter, change the cdi for a race or unrestricted cdi, and a free flowing exhaust to help it all on it's way. but remember that even after all these mods your still only looking at a small top end gain, after all it's still a 125cc. if your looking to bring the speed up even more than you need to find a good big bore kit, but that's a lot of work and not one i'd recomened a novice to install.
What else can I help you with?
How do you make a 125cc roadbike faster?
To make a 125cc road bike faster, consider upgrading the exhaust system for better airflow and performance, as well as tuning the carburetor to optimize fuel delivery. Additionally, reducing weight by replacing heavy components with lighter alternatives can improve acceleration. Finally, ensuring proper tire pressure and maintaining the bike regularly can enhance overall performance and speed.
What do you need to ride 125cc bike on the road?
a 125cc motorbike
What manufacturers make a 125cc sport bike such as the Aprilia RS 125?
besides aprillia, i know that Yamaha and i believe Honda both make 125cc bikes
How fast does a 125cc pit bike go?
a 125cc pit / stomp bike can reach limits of 70mph :)
Who is the best on a 125cc dirt bike?
Kawasaki is the best 125cc dirt bike. Hopefully this link will helps you.
Does a 125cc dirt bike with an 80cc frame go faster than a 125cc dirt bike?
yes the 125 with the 80 frame is goin to go a little bit faster because it is light it probaly feels like it has more torque too because it will pop up wheelies faster but probaly the 125 with the cr 80 frame.
Is a 125cc 2 stroke dirt bike the same as a 250cc 4 stroke dirt bike?
im not sure about that but i can say that a 2 stroke 125cc is faster than a 125cc 4 stroke and probably 200cc too. a 125cc 2 stroke would throw you off the back if you cant handle it properly, where as the 4 stroke wouldn't scare the living daylights out of you
What is the top speed of a 125cc pit bike?
will a 110 carb make a 125 pitt bike go slower
How can you make a 125cc gas scooter go faster?
Really nothing get a 150cc
Can you turn a 50cc pitbike into a 125cc pit bike with a malossi kit?
no i cant turn a 50cc pitbike into a 125cc pit bike the bike will blow up .
Whats the difference of a 50 cc dirt bike and a 125cc dirt bike?
The size or displacement of the engine, 50cc versus 125cc.
How can you make a 2-stroke 125cc dirt bike go faster?
put an expansion chamber on it You can install a big bore kit, shave the heads, pro cut the piston, and have it ported and polished.
