A.F.P.R. Explained
The addition of an A.F.P.R allows you to adjust fuel presser down to 40 psi. After
installation you shouldn't have to make an further adjustments. Depending on
what modifications you have done to your sled you will see a 7 hp gain at 40 psi.  
At 40 psi you are safe for normal trail riding, or long wide open runs.  We ran the
A.F.P.R. all last year with no problems.  With an air box mod (we sell larger 4 inch
air horns), 3 degree key way, v force reeds, and a light weight muffler. Now if you
can read plugs you may be able to run 38 psi or lower depending on your sled at
that point.  I know you can run 35 psi for short drag runs with no problems, but
there again its something you have to read your plugs. To make sure of how the
plugs are burning.  Using our A.F.P.R. is just like jetting down a carb sled or
leaning it out
.
The addition of an A.F.P.R. only effects wide open kinda like a main jet.  Low and
mid range are not effected because the injectors are not calling for 40 psi.  In the
event you get into some really cold weather you can easily just dial it back to 44
psi.  Simply by opening the valve all the way.
THE ONLY thing with our A.F.P.R. is that you have to run the sled on a stand.  Or
some how run the sled elevated allowing easy readability of the gauge.  The
gauge should read 40 psi at wide open throttle when you put the sled on the
stand and wack the throttle.  Watch the gauge.  If you set it to low it will show
40psi at idle then go to 20 psi or 30psi at wide open throttle.  You might have to
do this a few times until you get 40 psi when you wack the throttle or at wide open
throttle.  Setting the A.F.P.R. at two turns out will put it at around 43psi to 41psi
most of the time.  It should read 43psi to 41psi at idle then drop as you open the
throttle to wide open. You must be at 40psi to start the adjustment procedure.  
Unless 40 psi is your desired setting.  We do recommend using the A.F.P.R. at 40
psi unless you are comfortable reading your plugs for a proper burn.
Counter


                Installation instructions for the A.F.P.R.

To start the installation procedure you must first decide on a location for your fuel pressure
gauge. When we install an A.F.P.R. we have chosen to mount the gauge just to the left of
the regular/ethanol switch on the 2003 firecats. Or on the newer firecats where the ethanol
switch was located.

Next you must cut your fuel line about 8 inches from where the hose leaves the fuel pump
which is located just to the right of the oil fill for the oil injection tank. Insuring that the
placement of the A.F.P.R. is an a spot that it will not receive a great deal of heat.

After you have cut the fuel line you must position the A.F.P.R. so the arrow points towards
the front of the sled toward the injectors. Place each of the cut ends of the fuel line to the
appropriate side of the A.F.P.R. according to the fuel flow from the factory. Next slide the
hose on the A.F.P.R. from both sides as far as possible and tighten with the hose clamps
that are provided in the kit.

Next you must route the line leading to the gauge in a manner that will keep the line free
from interfering with the normal operations of the steering. Also be sure to keep the line as
far from heat as possible. This might require zip ties or creative routing of the line. Then
you can mount the gauge.

You must drill a hole at your desired location in order for the gauge to slip through from the
outside in. Allowing the hole to be big enough for the gauge to fit but so the ring around
the glass on the gauge will not slip through the hole. We recommend using a 1.5" hole saw.
Once you have the hole cut you can slip the hose clamp on from the backside and tighten it
so the gauge is snugly held in place. Once you are mounted you are ready to tune.

First go to the dial and turn it clockwise till it bottoms out or is closed all the way. Then turn
the dial back counter clockwise out 2 full turns. This should be a good starting point. Start
the sled and allow for it to warm up. The sled must be elevated in order to rev the
snowmobile up. Leave your belt on to account for drag from the track.

When the sled sits at idle the gauge should read around 41psi to 43 psi as a starting point.
Then when the sled is warmed up you can start the adjustments. Open the throttle all of the
way in short bursts making a note of where the pressure drops to at wide open throttle. If
the pressure is above 40psi simply turn the dial clockwise restricting flow. Adjustments
should be small in order to accurately adjust the pressure. If the pressure is below 40psi
simply turn the dial counter clock wise. Remember small adjustments are better.

When you have reached 40psi at wide open throttle simply rev the sled a few more times to
insure for accuracy. Always try to pay attention to the gauge over time to insure fuel
pressure is maintaining around 40 psi at wide open throttle.

In the event you want to adjust the fuel pressure down even further be careful. An
understanding of plug reading is important. Too lean or too low of pressure could burn
down the sled. In testing we have been safe running the A.F.P.R. as low as 37psi. At 37psi
the throttle should be held wide open no longer than around 800ft or less to be safe. At
37psi you will see a gain in horsepower of around another 3-4 hp depending on any other
modifications to the sled. But be careful to lean is dangerous so we do recommend the
A.F.P.R. being set at 40psi for safe operation.

At 40 psi you should see a gain of around 7 hp depending on modifications done to sled.

EVERY SLED IS JUST A BIT DIFFERENT THAN THE NEXT YOU NEED TO CHECK PLUGS FOR
PROPER COLOR

MAKE SURE THERE ARE NO LEAKS AROUND GAGE, OR A.F.P.R  REGULATOR WE ALL KNOW
WHAT LEAKING GAS CAN DO!!!!!!!!!!!!
Thank you