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ATC250R Forum => ATC250R => Topic started by: lrd_250r on September 14, 2016, 08:55:09 AM

Title: Jetting for ct pipe
Post by: lrd_250r on September 14, 2016, 08:55:09 AM

Boys, I need help with jetting...

1985 atc250r
Stock carb
Airbox with lid
900 ft elevation
CT Racing pipe


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Title: Jetting for ct pipe
Post by: lrd_250r on September 14, 2016, 10:27:12 PM

Sorry also no porting, stock motor

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Title: Jetting for ct pipe
Post by: StrokedAZ on September 15, 2016, 10:42:42 AM

I live about 2000ft and I use stock jetting.  48 pilot and ~150 main, air screw is 1 1/2 out I think.  This jetting worked for the FMF that it came with and the CT national I put on.  My lid is off though and I have a RAD valve which calls for 1 size smaller main.  Hope that helps.  To tell you the truth I would verify what needle you have because that can make a huge difference.

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Title: Jetting for ct pipe
Post by: lrd_250r on September 15, 2016, 10:18:41 PM

Thanks, now I have a starting point

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