Re: Size of shoulder screw for air cleaner screw on 1981 Honda Express NC50?

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Looks like maybe a 5mm thread as the washer that fits it is 5mm . I'd place the air cleaner as it should be on the bike and then measure what length of screw is needed .

Then find a tube of some sort to use as a spacer to take the place of the original shoulder section .

You could always zip tie or wire the air box closed until you find a suitable screw .

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