bing 12mm issue

Cookie /

so i have a good bing 12mm on my sachs 505. i have a 62 jet in it and a free flow air filter and a jammy puch pipe installed.

i can turn the air fuel screw all the way in and bottom it out and the bike will still run. as i adjust the screw i get no real affect of change.

air leak? intake gasket leak? i need some ideas please..

thanks Cookie

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