Diagnoise my snail reading needed Options

[bandjoey]

73 2.0 Delortos

Last major tune was about 9,000 miles ago and running like a champ until today and it felt like a slight misfire. Just to see if one cylinder was reading different I used the snail on the stacks and found these readings.

#1 reading 7 and vibrating the needle up and down 1 number
#4 #5 solid
#2 #5 solid
#3 reading 7 and vibrating the needle up and down 1 number

Due to equal vibrating readings on 1 & 3 could there be one thing causing this reading or am I hoping too much?

[VaccaRabite]

I'm guessing that your control arms for the carbs are on 1 and 3, not 2 and 4?

I bet you need to tighten up your linkage. I bet it has vibrated a bit loose, and is transferring load to the throttle plates on 1 and 3 giving them a little flutter. Or you have vibrated into a slight air leak. Either way, things needs to be tightened up.

Once that is tightened, you can balance the barrels with the balance adjuster nuts, if needed.

Zach