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Although what we can't tell from the pictures is where the hidden filter is located since his carbs are on the bike. Can anyone offer some guidance as to where to look for the tube that has the hidden filter while the carbs are on the bike?

We really have no clue what we are doing when it comes to this kind of stuff.



Glad you got it sorted out.
With the tank off, follow the fuel line to the connection on the tee on the carbs. There is a little spring clamp holding the fuel line on. Loosen the clamp, slide it up the fuel line a ways, and pull the line off the tee. The little filter is down in there. It is difficult to get to with the carbs on the bike. I used several different straight and bent needle nosed pliers. The hardest part was trying to re-connect the line.
You can save a ton of money and inconvenience doing your own maintenance and troubleshooting, just be careful and check everything twice. A little fuel leak and resulting fire could ruin your whole day.