1980 cb750fa VB52 Carbs - strange vaccum guage action

ajh1

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Hi
I have a little quiz question! I have just done some work on my carbs and came to syncing them. Everything synced well and bike runs and goes perfectly but when syncing I had a different looking reading on the number 4 guage, the mercury was very stable compared to the 3 other cylinders that pulsed with the engine. See video -

UPDATE - my mistake, so rarely use the guages i completely forgot about needing restrictors in the hoses to steady the readings, I only had a restrictor in number 4 and not the other 3 (thanks to Genesound from another forum)
 
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