According to the manual, #3 is the base carb, IIRC! But i'm almost 100% it's 3.

Find the downloadable PDF of the manual on this forum. It's super to have.

 

Did you drain the carb bowls and then put new gas? If not, there's still plenty of old gas in the pump, fuel filter, hoses, and carb bowls that needs to be pushed and drained out! With the drain screws on the carb bowls opened, crank the bike and the pump will feed whats left in it and in the fuel filter out. Then with a clean gas tank, and new gas, you should eliminate and problems there. Pull the fuel filter out and blow through it and see how much resistance there is...

 

Yeap, I cleaned all that, took off the vacuum chamber and float and cleaned the jets, fuel filter, fuel lines, etc. Problem is I probably got some of that junk from the fuel tank go back in the carbs and sit and clog up again. I wasn't able to clean up the tank 100% as I mentioned in the previous post. What do you use as a solution to clean the junk inside tank? I've got few dirt sized junk in the tank that doesn't wanna come out, on top of it that, about 1-2 oz fuel will remain that doesn't wanna come out as well when emptied, because of the shape inside the F4 tank.

*I have the F4 manual, I just couldn't find it where it said 3 as the base carb, just says use base carb as reference.

 

It doesn't matter if you have gunk in the tank because it won't pass through the fuel filter!

"gunk" can form in the carbs from fuel that sits, but it cannot 'get into' the carbs unless you're not running a fuel filter before the pump!

 

On 2nd thought, it's actually the 4th carb on the F4, forgot that I already read that part before.

 

I had a couple gallons of stale gas (but it was clean) and I tried flushing the remaining gas out. That really didn't work, so I found this organic stuff online and the process went something like this: get as much gas as possible out, spray the hell out of it with water and QUICKLY shoot it out with compressed air so it doesn't rust, fill the tank with this solution which sits in there for a few hours and eats up the rust and crap, then flush it out.. I was skeptical but it worked. It was made out of citrus acids IIRC and if you google it I'm sure you'll find it. I'll try to remember what it's called.

Stuff was called Rusteco. Solved my issues.

 

Thanks, I'll check it out. And what about carb cleaner? I used it for the carbs obviously, and cleared most of the clog first time around. I am wondering would it be ok to use it on the gas tank? The auto parts store sell them by the gallons. And once they're dry, they're not harmful for the engine. I wonder if they're rust proof.

 

Not sure where to begin with this one. OK here goes.
First I burnt my battery by running bike with a bad rectifier regulator.
To troubleshoot problem I used another battery to help me out. I disconnected the battery and let the alternator/ rectifier take over. It didn't, spare rectifer helped me out. Ok now with new rectifer, alternator does take over when battery is removed from the system, but when engine sputters during idle- rectifier cuts out.
I know that spuddering idle cutting out my voltage rectifier/ electical system may not be a good judge of performance, but if this happens all the time while my system is operating, it affects the battery life and overall spiking in my electrical system.
Ok here is where it gets from bad to worse. I install a carb sycronizer to adjust my carbs. From what i read the master carb is the one to the extreme right, #4. This happens to be the smoothest of the bunch. #3 is smooth as well. #2 is the worst and is having the most impact on throwing my idle off. #1 is off as well too, but not as bad as #2.
ok i attemped to adjust in between #2 and #3 no luck.
From what i hear you cannot adjust a "Vacuum leak."
Now vacuum leaks from what read are caused by many things from bad carb bodies, vacuum hoses and bad intake valves.
My bike does idle, but its not a pretty idle. So now with becoming obsessed with a "perfect" idle where to i begin without getting too crazy. From what i can tell digging in a "Vaccum leak" can become crazy.

 

cbtrez did you clean the carbs? Sounds like a dirty idle jet, do a full carb clean and remove and clean all the jets esp the idle jet, theres a write up on this forum that you can search and it has pics.

 

yeah carb clean is definately ok for the tank but make sure you get everything out of it before you refill it and run it, otherwise it was a waste. I brought my tank full of old but clean gas into a dark room and used an LED flashlight to look inside and look for debris.