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What is this? Carb mod?

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Hi,

I just picked up an very well used 150 expert for my wife. Will be a winter project to go through it.

However, what is this blue thing on the carb?

How should it be adjusted?

Is it just a fancy air screw?

 

IMG_8868.thumb.jpg.369b66d33317d670b09173474bff0fff.jpgIMG_8869.thumb.jpg.0a653001cce3ab2cee67f199f8fb8a01.jpg

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It looks like a power bowl. Changing out the jets is the best thing for this carb. I always had trouble starting mine until I did changed them.

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On 8/26/2017 at 2:17 AM, Vaporize said:

Hi,

I just picked up an very well used 150 expert for my wife. Will be a winter project to go through it.

However, what is this blue thing on the carb?

How should it be adjusted?

Is it just a fancy air screw?

 

IMG_8868.thumb.jpg.369b66d33317d670b09173474bff0fff.jpgIMG_8869.thumb.jpg.0a653001cce3ab2cee67f199f8fb8a01.jpg

It is a adjustable leak jet. Here is some more info. Most people adjust them from 3/4 turn closed to 1 1/2 turn. 

https://dirtbikemagazine.com/how-to-adjust-your-keihin-fcr-leak-set-rd-racing-gives-tutelage-for-key-power-gains/

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On 9/1/2017 at 3:15 PM, mcpeak762 said:

It looks like a power bowl. Changing out the jets is the best thing for this carb. I always had trouble starting mine until I did changed them.

I'm curious, what jet sizes (and needle) did you end up with?

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