Motorcycle Repair: 85 nighthawk s carb bowls, throttle cables, vacuum line


Question
You helped me out before on a petcock issue. Now I have a new problem-
I'm only getting fuel into the #2 and 3 carbs. After I put in the new petcock
it started right up and ran really good for about 5 minutes, I didn't ride it as I
was going to change the oil after it got warmed up. After that I put an inline
filter on and started her up again but this time it acted like it was not getting
enough fuel. The filter was filled up fine but I discovered that only the #2+3 bowls
had fuel in them! What would you say is the problem now?
Also when you remove carbs which way do you proceed with removal,
left side or right since I think some dirt got thru before I installed the filter!
Petcock screen was clean though.
Thanks for your help!
Thanks for an answer!

Answer
Hi again Steve,

That inline filter seems to be the reason why only the #2 & 3 bowls are getting fuel. This is a common issue with in-line filters. Also, if it ran fine without the filter then this would point to the filter as the culprit.
Are you using the vacuum line or did you set it for the gas to always flow when the fuel selector is switch to 'on'?
What kind of in-line filter is it? Is it made for a motorcycle?
The reason I ask is because I once tried to use a 'universal' type on a motorcycle and it didn't allow fuel to the #4 carb. The in-line filter I now use was purchased from the Honda dealer and is actually a Harley filter! But it works fine.

I remove the carbs to the left side (when sitting on the bike). I am able to remove it with the throttle cables still attached, but I take the cables out of their holders (on the carbs).
Some other tips for removing the carbs:
- Be sure to remove the two bolts at the top of the air box that bolt it to the frame (near the air filter cover). Also take off the two bolts on each side of the air box that old it to the frame. The one on the left is behind the clutch line and the one on the right is the bottom bolt on the battery holder. This will allow you to slide the air box back a bit and give you a bit more room to move the carbs around.
- I use a hockey stick (wrapped with a rag) to pry the carbs out of the boots on the engine side. I pry against the engine and the carb bodies to 'pop' the carbs out. Do the reverse to pop them back in when re-installing them. Saves struggling with them by hand
- Since the carbs will not come out all the way with the throttle cable's attached, place a rag over top of the alternator so when you remove the float bowls, you don't get gas all over the alternator.