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Petrol tank

Tiger t

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Tunbridge Wells. Kent. England
Hi everyone, this is my first post. I have just picked up a 1996 CB750 for a winter project. The bike is ok, just a few problems to solve. The main problem is the petrol tank. The underside of the tank has two breather tubes. One is 0.400 thou diameter that runs to the petrol cap. This breather is ok, not blocked.

The other breather is 0.187 ( 3/16 ) diameter. Petrol pours out of this tube. If I blow down this breather, it feels as though it is blocked and yet when the tank has petrol inside it flows out

Would it be ok to block this breather or will that cause problems.

Thanks in advance for any information. I will probably be posting regularly in the future.
 
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