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The leak jet in the float bowl is a tuning device much like the other jets in the carburetor, which when used correctly will provide the engine with the correct amount of fuel. The first picture (yellow) shows the location of the leak jet The second (red) shows the location of the accelerator pump Before you start with the troubleshooting and repair steps below, use carb cleaner and an air gun to clean and blow out every jet, orifice, and passageway in the carb
In order to work correctly, the carb must be gunk free, and not worn out (eg The leak jet is part of the accelerator pump circuit As the pump squirts fuel into the passage leading to the venturi, a portion of the fuel is allowed to leak back into the float bowl The leak jet effectively reduces the fuel pumped to the motor to a fraction of it's potential, which helps prevent flooding and allows more consistent jetting.
And also what is the jet as you look into the intake side of the carb, it says it is a #100 and on the alba microfiche it says it is a main jet. The keihin fcr carburetor utilizes various fuel jets to control the amount of fuel delivered to the engine These include the main jet, pilot jet, and leak jet. I'm in the process of rebuilding my first set of slant body fcr 41mm carbs
I'm putting everything back together and (here's where i tell on myself) i don't remember how many turns out the adjustable jet (not sure what its proper id is) was set to It's the jet on the left in the photo 7 common 4 stroke dirt bike jetting issues [fcr carb on 4 stroke mx bikes] kelley fager | mxhideout 28.5k subscribers subscribed I found this in the september 2009 issue of motocross action magazine
Stock / middle groove fuel screw 2 ½ turns out airmobile101 year Uni filter w/ modified lid other mods 13.5:1 piston, hc stage 2, 40mm fcr elevation
This is a view of the bottom of the carb, looking up towards the top This large hole is accessed via a 17mm hex drain plug The small hex shaped jet is the main jet, the small single slotted jet under the main jet, is the pilot jet The small jet on the bottom of the picture, is the air fuel screw
New jets installed, rechecked, hot start plunger lubed and free.throwing me for a loop Adjusted float level and resat the mixture screw and the leak seems to have all but stopped Still dealing with the pilot circuit though Will idle with choke on, dies without choke.
This is a pretty basic outline for jetting on the yfz450 Smaller jet = more restriction = bigger pump shot in the venturi You can find the leak jet by removing the bowl of your fcr carb Look in the bottom of the bowl, and you'll see a small brass orifice that you can remove with a screw driver
Currently trying to get the pilot circuit situated Carb has an r&d powerbowl 2 on it with the adjustable leak jet. Also, not all fcr's have a leak jet The sudco style 41mm mx carb for one does not
Although the casting boss is there, and it can be drilled and tapped to accept a leak jet. Yamaha yfz 450 yfz450 ncvq needle carburetor fcr | ebay here is one apart that i moded, leak jet is located at bottom of the bowl, some guys block it off, i prefer to install the 35 leak. The only other approach is to limit the stroke by as mush as 50% The pump was originally designed to squirt fuel for a bank of 4 carbs on a 1000cc motor
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