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Discussion Starter · #1 ·
My Gregory's manual says when setting the timing on my petrol only carby TB42 @ 10degrees, the vacuum hose should be left in place on the advance unit. I was always under the impression that the vacuum hose should be removed when timing this type of engine. If I set it with the hose off, and then replace the hose the timing advances (naturally) about 5-6 degrees. I have done a search here but not found a conclusive answer. So which is it 10degrees at vacson or vacsoff?

Onyas.
 
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