Gearing Problems on Lifan 125cc Pitter

divekid · 01-27-2022, 02:12 PM

Hey guys,
Background: I picked up a 125cc lifan pit bike off of offer up (first mistake lol), it had a faulty 22mm carb that leaked everywhere (replaced with a different 22 and problem solved. Also have a uni pod filter that probably needs some oil ). I just recently finished tuning the carb and upon the first few test rides I was a little disappointed. My first two gears are super short and top speed, at least in my limited stretch of road, is about 35mph. I was under the assumption that these lifans hit about 40 stock. I plan on taking on a bigger stretch just to double check. If it helps, my gears are 15 front and 41 back. Is this normal? I’m just getting into this money pit of a hobby and don’t know too much haha. Anyways, thank you in advance for the help and let me know if you need more info.

Falkon45 · 01-27-2022, 06:57 PM

What's the model? It probably can take the generic dirt bike sprockets.

culcune · 01-27-2022, 10:52 PM

Quote:

Originally Posted by Falkon45

What's the model? It probably can take the generic dirt bike sprockets.

For sure the countersprocket (engine) should be able to be changed with any number of generic pitbike sprockets they sell on Ebay or Amazon.

divekid · 01-27-2022, 11:44 PM

Quote:

Originally Posted by Falkon45

What's the model? It probably can take the generic dirt bike sprockets.

The guy I bought it off of just said it was a Lifan model. After further investigation, I found a bike that looks the exact same also under the lifan name. For your sprocket idea, I’m going to probably try a 16/36 ratio or something and see if that helps. Thank you!

Bruces · 01-28-2022, 12:32 AM

You need sprockets for Honda crf type bikes ,couldn’t be any easier to find what you need for very little cash .

Mudflap · 01-28-2022, 06:52 AM

Wheel size is an important factor in deciding on the optimal gear ratio.

Bruces · 01-28-2022, 08:19 AM

I meant crf 50 type bikes which is what most pitbikes derived from .

Falkon45 · 01-28-2022, 01:41 PM

https://www.gearingcommander.com/

This can be a big help in figuring out if you're within the correct speed

divekid · 01-31-2022, 02:46 PM

Quote:

Originally Posted by Mudflap

Wheel size is an important factor in deciding on the optimal gear ratio.

I have a 10” in the back and a 12” in the front

01-27-2022, 02:12 PM	#1
divekid Join Date: Jan 2022 Posts: 4	Gearing Problems on Lifan 125cc Pitter Hey guys, Background: I picked up a 125cc lifan pit bike off of offer up (first mistake lol), it had a faulty 22mm carb that leaked everywhere (replaced with a different 22 and problem solved. Also have a uni pod filter that probably needs some oil ). I just recently finished tuning the carb and upon the first few test rides I was a little disappointed. My first two gears are super short and top speed, at least in my limited stretch of road, is about 35mph. I was under the assumption that these lifans hit about 40 stock. I plan on taking on a bigger stretch just to double check. If it helps, my gears are 15 front and 41 back. Is this normal? I’m just getting into this money pit of a hobby and don’t know too much haha. Anyways, thank you in advance for the help and let me know if you need more info.
	0

01-27-2022, 06:57 PM	#2
Falkon45 Join Date: Aug 2020 Location: Savannah, Ga Posts: 759	What's the model? It probably can take the generic dirt bike sprockets.
	1

01-28-2022, 12:32 AM	#5
Bruces Join Date: May 2018 Posts: 1,584	You need sprockets for Honda crf type bikes ,couldn’t be any easier to find what you need for very little cash .
	1

01-28-2022, 06:52 AM	#6
Mudflap Join Date: Sep 2014 Posts: 1,877	Wheel size is an important factor in deciding on the optimal gear ratio.
	0

01-28-2022, 08:19 AM	#7
Bruces Join Date: May 2018 Posts: 1,584	I meant crf 50 type bikes which is what most pitbikes derived from .
	0

01-28-2022, 01:41 PM	#8
Falkon45 Join Date: Aug 2020 Location: Savannah, Ga Posts: 759	https://www.gearingcommander.com/ This can be a big help in figuring out if you're within the correct speed
	3