When I get my F3 straight vertical or rip it up really fast it boggs bad because it is getting too much gas. I just put new plugs in it and after today they fouled out. Is there any fix that you guys that ride carburated bikes do to fix that...or is that a prob that just the F3's have (I doubt it). Getting frusterated when I trying to roll slow stuff and the engine falls flat on its face because it is too rich.

 

if its fouling out the plug your gettin to much gas to your carberauter (sp?) have you adjusted your air fuel mixture screw?

 

I've 12'ed a bone stock F3 before and had no probs like that. I'm guessing it might be a float issue on your bike...I'm no mechanic though.

 

Dude your not flooding it your starving it.
When you hit the 12 posistion, the Gas in your bowls flow out the carb overflowtubes in the bowl, also the floats fall into the seated position (gravity) , thus you have no fuel in the carbs.

Just a guess cuzz more info is needed, every done any work on the carbs/airbox/exhaust?

Remember carbourators arent meant to run verticle, but there are mods to make it work.

 

That is what I thought...it would be starving it....but it is fouling plugs. I know it is getting too rich (flooding). Would lowering the floats help? What carb mods can I do?

 

NO lowering the floats are just going to make them seat faster. If anything you want to raise them to increase the gas in the bowls. But you will/might notice some gas leaking out of the carb vent tubes at the bottom of the bowls

Wait a muinut just thought of something, does the f3 carb have what looks like a jet (probably has the #5.5 or somewhere close to ) on the front belmouth of the carb where the airbox attaches. These are little air assyst jets and will get flooded with gas as the carb turns on its back. If you find this take out the jet and plug it off, you will have to adjust the carb though.

Jet kits from Dynojet often will plug these off when you get a jet kit.

Still need to know if youve had the carbs worked on or jeted????

 

Yes...I do have a jet kit. It is a factory 1.0. I am running the following jets: 140 out 142 in; stock was 135 out 138 in. I used their needles and my pilot is #40 with the pilot scrow turned 2 turns out. I have a full hindle exhaust and a K&N. It runs perfect during everything.....part throttle, full throttle, regular wheelies..etc. It just floods when I ride a 12, drag bar for an extended time or if I park it on the bar. I know its flooding b/c when I get it down after it dies and try to restart it, it takes a while of cranking at full throttle and blows dark smoke from the exhaust.

 

it's not flooding, trust me.

if you want to see proof, get a glass in-line filter from autozone and stick it between your carbs and tank.

park it and run it till it dies, then check the filter and it will be empty

tell chris and clay i said hi

 

????? ?????

that just proves tanks eventually run out of gas. My guess would be if he did the filter idea then (sat it at 12'o clock) and ran it till it died the filter would be full cuzz the floats sealed the flow from the tank to the bowl, thus starving the motor.

Those jet settings seem about right for the bike at sea level, what I would do is take the Carb Rail off and give it gas flow while holding it in your hands. Tillt it back slowly looking down into the ports and see if gas flows through any of the inner holes. Basically the easiest way to figure it out is creat the environment while you can see whats going on.

The reason it takes a long time to start again though is cuz the bowls have to fill up again. If it was flooded then starting it at full throttle would not work at all.
But this is going to be a hard one to figure out without seeing whats going on.

 

Is your air cleaner fuel soaked if yes take all the breathers out of the airbox and plug the holes to the airbox. let the breathers hang.

 

F3's have an electronic fuel pump.
how long has it been piped and jetted

 

If I was starving it and wasn't fouling plugs, then how would I go about fixing the lean condition? Would I raise the floats so the bowls would hold more gas? if that is the case how would I compensate for it running rich at 0 to about 1/8th throttle? (maybe turn in th pilot screw?) Thanks for all the help.

 

It has had a full exhaust forever...it has been jetted for about 4 or so months. I am just now starting to get the extremely slow stuff down so this problem has not occured before because I never had to snap the front end up so fast. I'm puzzled

 

is your tank dented?

if it's dented bad, it might not breath good, clean your filters and keep a full tank and a couple gallons handy when you go ride to top off.

i forgot you got a fuel pump

but, as far as the filter goes, if the carbs are cuting the fuel, then the filter will not be full after running at 12 because vaccum will not be created to pull fuel into it.

 

Vacume??????

its either gravity fed or elec fuel pump.

The only vacume on a CV carb. is in the ventury port itself which pulls the fuel from the bowl through the jet. Carbs don't "pull" gas at all.


You might be running a hair rich on your settings, thus took 4 months to cake-up. As far a seating the floats later just open the bowls take out the flaot and bend the tab that actuated the float seat. Carefull though you will want to measure it and make sure there sumwhat even.

 

I had the same problem on my 900. So i went and got a 929 it dosen't do that **** any more!!!!! THATS MY WAY OF FIXING IT. :YEAH

 

then theres always the easy way

 

I've already thought about that...I could sell everything that I have for the F3 (bike, and extra full set of fairings) and pick up a salvage 929....that is what I think that I want to do...might be a couple months though.