YZ450F Gearing!

TonyBMWM3
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TonyBMWM3
Edited Date/Time 4/29/2019 7:28pm
I Just Bought My New YZ450f 2010. It's My First 450 I had a Honda 250 and have ridden plenty of dirtbikes before. But I'm Feeling Weird About the gearing and I don't know maybe if my Clutch is slipping.???. The guy I bought it from has it set up for full blown race. It has a 50 tooth Sproket on it. Just weird because I hit the gas shift hit the gas shift when I'm in 5th it feels just as short as 3rd and winds out just as quick. Some one help me out and let me know!

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Paw Paw 271
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Paw Paw 271 4/16/2016 9:35am
4/16/2016 9:35am
What size is the countershaft sprocket?
If it's a 12 than you have a 4.16 ratio. ( this is very low gearing)
If it's a 13 then you have a 3.84 ratio. ( this is below normal gearing)
If it's a 14 then you have a 3.57 ratio. ( this is higher gearing than stock)

I would suggest about a 13/48 tooth set up for your bike as a starting point, but I would also make sure the clutch is adjusted correctly and not slipping. If slipping, it can be caused by using the wrong oil, weak springs or worn plates.

Paw Paw
TonyBMWM3
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TonyBMWM3 4/16/2016 9:45am
4/16/2016 9:45am
Paw Paw 271 wrote:
What size is the countershaft sprocket? If it's a 12 than you have a 4.16 ratio. ( this is very low gearing) If it's a 13...
What size is the countershaft sprocket?
If it's a 12 than you have a 4.16 ratio. ( this is very low gearing)
If it's a 13 then you have a 3.84 ratio. ( this is below normal gearing)
If it's a 14 then you have a 3.57 ratio. ( this is higher gearing than stock)

I would suggest about a 13/48 tooth set up for your bike as a starting point, but I would also make sure the clutch is adjusted correctly and not slipping. If slipping, it can be caused by using the wrong oil, weak springs or worn plates.

Paw Paw
I have to double check what kind of Oil Should I Use?
TonyBMWM3
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TonyBMWM3 4/16/2016 9:52am
4/16/2016 9:52am
Paw Paw 271 wrote:
What size is the countershaft sprocket? If it's a 12 than you have a 4.16 ratio. ( this is very low gearing) If it's a 13...
What size is the countershaft sprocket?
If it's a 12 than you have a 4.16 ratio. ( this is very low gearing)
If it's a 13 then you have a 3.84 ratio. ( this is below normal gearing)
If it's a 14 then you have a 3.57 ratio. ( this is higher gearing than stock)

I would suggest about a 13/48 tooth set up for your bike as a starting point, but I would also make sure the clutch is adjusted correctly and not slipping. If slipping, it can be caused by using the wrong oil, weak springs or worn plates.

Paw Paw
You have a number I can text you at if I have any more questions. I need to learn about these bikes more.
mxb2
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mxb2 4/16/2016 10:28am
4/16/2016 10:28am
Read the service manual.

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TonyBMWM3
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TonyBMWM3 4/16/2016 10:33am
4/16/2016 10:33am
So It's normal with The 50 tooth to wind out gears really quick.
Paw Paw 271
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Paw Paw 271 4/16/2016 11:29am
4/16/2016 11:29am
TonyBMWM3 wrote:
So It's normal with The 50 tooth to wind out gears really quick.
THat would be based on the combination of the countershaft sprocket and rear sprocket numbers, but yes in general a 50 tooth rear sprocket will wind out quicker than a 48 tooth sprocket. Keep in mind that a single tooth size change on the countershaft sprocket is about the same as a three tooth change on the rear sprocket.

Paw PAw
adam8781
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adam8781 4/16/2016 11:42am
4/16/2016 11:42am
its not a drag racer
TonyBMWM3
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TonyBMWM3 4/16/2016 1:21pm
4/16/2016 1:21pm
TonyBMWM3 wrote:
So It's normal with The 50 tooth to wind out gears really quick.
Paw Paw 271 wrote:
THat would be based on the combination of the countershaft sprocket and rear sprocket numbers, but yes in general a 50 tooth rear sprocket will wind...
THat would be based on the combination of the countershaft sprocket and rear sprocket numbers, but yes in general a 50 tooth rear sprocket will wind out quicker than a 48 tooth sprocket. Keep in mind that a single tooth size change on the countershaft sprocket is about the same as a three tooth change on the rear sprocket.

Paw PAw
I saw it now I have A 13, and Rear Sproket Is 50.
Paw Paw 271
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Paw Paw 271 4/16/2016 4:13pm
4/16/2016 4:13pm
Change out your counter shaft sprocket to a 14 tooth or go down to a 47 on the rear sprocket. You will be back in the ball park then.
RE: Oil... Make sure the oil you use is wet clutch rated. Many good oils on the market. Make sure the lower have of the oil rating seal is blank or empty.

Paw Paw
F14tomcatfreak 4/29/2019 4:44pm
4/29/2019 4:44pm Edited Date/Time 4/29/2019 4:47pm
Hi what is a good gear ratio to reduce the intitial hit on low end for 2018 yz450F? I am currently running stock gear ratio 13 on the countershaft and 48 on the rear.
Paw Paw 271
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Paw Paw 271 4/29/2019 7:28pm
4/29/2019 7:28pm Edited Date/Time 4/29/2019 7:29pm
You will not be able to gear that right off idle hit out of that bike. The only way to do that is to remap it to help it any.

Paw Paw

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