The engine started yesterday

The engine started yesterday but only ran for a few seconds. I had to squirt some gas into the carbs and it fired right up. Took the top off the cards and there is a lot of varnish in the carbs. So I cleaned the top part of the carbs and put them back together and it ran till the bowl emptied I think. I think the fuel filter I put on the tank may be slowing the fuel flow down to much so I may remove that today and give it another try. I may need to remove the carbs and completely clean them, I hope not. I will post the results of today attempts in a litte while.