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Sprockets for Lifan swap

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モンキ

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Discussion starter · #1 · (Edited)
Im trying to figure out what would be the best tooth choices for my bike with 10" tires
Putting a 125 Lifan in and will be running 10" wheels, 100/90 tires and be a street ridden bike.
Anyone have experience with this set up and can recommend sprocket sizes?


Thanks for your help. :p
 
#5 ·
My 91 ct70 has a yx140. Stock 3.50x10 tires. I've currently got 18/35. The lil bugger still pulls to the max (about 115km/hr) quite easily. I have a 32 tooth rear on the way (smallest I could find). If its still geared short, ill go bigger on tires. I just want to get the rpms down for cruising at speed. I figure ill just go as tall as I can pull. No idea on rpm, but I do have a small tach on order to give myself an idea.
 
#7 ·
What gears did u go with and how does it feel or go?
 
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Discussion starter · #8 ·
I dont remember what I went with but I can check. It doesnt run yet so I cant say how it goes. :)

Still need and exhaust and a battery and ill then Ill be good to go. With the holidays and a new baby here Ive had to wait a bit to get the final parts.
 
#9 ·
What is the engine going in exactly?
I just swapped a 125 lifan in my crf70. It has stock 12" tire n stock rear sprocket.
Front sprocket is a 15 I think rear is 36.
It pulls good in every gear to me, but I didn't get any mph runs.
I put it in this bike first before I swap it in a z50 setup with 8" rims to get it running.
ill need a bigger front to get more mph in it.
 
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Discussion starter · #10 ·
DSR BLACK DEATH said:
What is the engine going in exactly?
I just swapped a 125 lifan in my crf70. It has stock 12" tire n stock rear sprocket.
Front sprocket is a 15 I think rear is 36.
It pulls good in every gear to me, but I didn't get any mph runs.
I put it in this bike first before I swap it in a z50 setup with 8" rims to get it running.
ill need a bigger front to get more mph in it.
Click to expand...
Sorry...I just realized this is an older thread when I was planning the 125 swap.
I ended up swapping in a Piranha 140cc instead of the Lifan 125.
 
#11 ·
Ok did ya sell the lifan?
What is it going in?
What mounting or setup issues are u having?
I want to get a 140 also
 
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#13 ·
What about the carb pet cock clearance or tank clearance?
 
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#17 ·
What kind of real world mph do you see with that gear ratio?
 
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#19 ·
What engine, exhaust, carb did u have?
70Mph seems a lil scarry...
 
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#20 ·
An older type yx140 (completely black with, cilinder with the fins lengthwise),
carb vm26-665 + K&N,
exhaust OVER twin carbon long or alternatively a takegawa bomber with(-4pmh) or without(loud) dbkiller.

Nothing scary with decent roads, it had heavier wt oil in the forks and a better shock in the back and a grippier brake disk.
 
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