Runtong KCRB carburetor

David4200

New Member
Jun 6, 2020
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Hi! I was wondering if anyone knows where to get instructions for the Runtong KCRB carb, or if anyone has experience with these.

I'm not sure what to do with three vacuum lines nor do I know for sure what I need to do to tune it. Any suggestions would be appreciated.
 

David4200

New Member
Jun 6, 2020
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your first pic is similar but has two lines at the bowl vent area and mine has only one. Your second pic, mounted on your bike, looks about right. I saw a pic online of a similar carb that did this with the other two lines
 

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Greg58

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May 1, 2011
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That hose on the bottom should hang down, it's the overflow in case the needle gets stuck open, you can see the hose on my picture. You can just let the hoses point down if you want. The way you have it if the float sticks the fuel can't drain and will go into the engine.
 

David4200

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Jun 6, 2020
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any advice on tuning? I have gathered so far that I need to adjust the needle into the "upper" position, but I haven't yet found out how to do that.