YZ250 pro circuit exhaust jetting

mxallum77
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mxallum77

Hi guys 
Just bought a full pro circuit exhaust system for my yz250 2020, just wanted to getting people thought on jetting with new exhaust I have heard you should go to a 180 main ? 
Cheers 

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YZed250
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YZed250 8/19/2024 3:58pm
8/19/2024 3:58pm
mxallum77 wrote:
Hi guys Just bought a full pro circuit exhaust system for my yz250 2020, just wanted to getting people thought on jetting with new exhaust I have...

Hi guys 
Just bought a full pro circuit exhaust system for my yz250 2020, just wanted to getting people thought on jetting with new exhaust I have heard you should go to a 180 main ? 
Cheers 

Keep in mind that most of the procircuit specs will be for a expert mx rider with good traction on a fast track. Might be too rich for an average joe, but a good and safe starting point, most will go leaner from there. 

1
mxallum77
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mxallum77 8/19/2024 10:44pm
8/19/2024 10:44pm
mxallum77 wrote:
Hi guys Just bought a full pro circuit exhaust system for my yz250 2020, just wanted to getting people thought on jetting with new exhaust I have...

Hi guys 
Just bought a full pro circuit exhaust system for my yz250 2020, just wanted to getting people thought on jetting with new exhaust I have heard you should go to a 180 main ? 
Cheers 

YZed250 wrote:
Keep in mind that most of the procircuit specs will be for a expert mx rider with good traction on a fast track. Might be too...

Keep in mind that most of the procircuit specs will be for a expert mx rider with good traction on a fast track. Might be too rich for an average joe, but a good and safe starting point, most will go leaner from there. 

Yea agreed im not expert 😂 … Looks like pro circuit jetting specs go other way with a smaller main 🤨

1
SoCalMX70
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SoCalMX70 8/20/2024 9:41am
8/20/2024 9:41am

Sea level - 3k feet

175 main, 48 pilot, 40 power jet, N3EW-3, AS 1 turn and adjust from there.

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Alex814
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Alex814 8/20/2024 4:43pm
8/20/2024 4:43pm
mxallum77 wrote:
Hi guys Just bought a full pro circuit exhaust system for my yz250 2020, just wanted to getting people thought on jetting with new exhaust I have...

Hi guys 
Just bought a full pro circuit exhaust system for my yz250 2020, just wanted to getting people thought on jetting with new exhaust I have heard you should go to a 180 main ? 
Cheers 

YZed250 wrote:
Keep in mind that most of the procircuit specs will be for a expert mx rider with good traction on a fast track. Might be too...

Keep in mind that most of the procircuit specs will be for a expert mx rider with good traction on a fast track. Might be too rich for an average joe, but a good and safe starting point, most will go leaner from there. 

mxallum77 wrote:

Yea agreed im not expert 😂 … Looks like pro circuit jetting specs go other way with a smaller main 🤨

They use C12 fuel which takes leaner jetting than pump gas

2

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