Saturday, August 23, 2014

1994-2003 Honda Magna VF750C Fuel Leak Fix

Problem: I did not use the Magna for about six weeks.  When I started it up fuel was running out of the bottom of the carburetor near the fuel value.  If I kept running the bike but turned off the fuel value, the fuel would stop leaking.  Turn the valve on again, and it would resume leaking.

What is happening?!?  The carburetors are gummed up.  When fuel cannot flow out of the carburetor as fast as the fuel pump supplies it, the fuel overflows the carburetor.

Solution: Clean the carburetors.

Required tools:
Phillips screw driver
12 mm socket and ratchet
Allan wrench for fuel tank bolt - unsure of size
Needle nose pliers
Carburetor cleaner

1. Run the bike with the fuel valve open.
2. Turn off bike.
3. Shut off fuel value.  We want some fuel in the carbs for this procedure.
4.  Remove the seat.  This is easily done with a 12 mm socket and ratchet.
5.  Remove the side covers.
6. Remove the fuel line from the fuel valve.  Use needle nose pliers to remove the retaining ring and slide the fuel line off.  It can be tough to get out of there!
7. There is a small hose on the bottom of the tank that leads to underneath the seat.  Disconnect this hose that normally resides under the seat.
8. Remove the bolt with an allen wrench the secures the tank.
9. Pivot the tank upwards a few inches and slide it back.  The tank's front simply rests on two big rubber-coated prongs.  Be careful to not hit your handlebar riser with the tank and chip the paint!
10. Now you are at the air cleaner housing.  There is a strange rubber goose neck air intake.  It is secured by two screws.  Remove the screws and remove the air intake.
11. Remove all the screws on the top of the air box.  There are about 13.  You will also need to remove the plastic covers that attach to the frame behind the tank.  Easy work, but a lot of screws.  Organize your screws because they are all different sizes!
12  Remove the air cleaner housing cover.  It will take some work to get it out of the way.  You will see this:

Top of air cleaner box removed
13. With your carb cleaner handy, start up the bike.  It should run even without a fuel tank.
14. Spray carb cleaner down each of the four horns.  Open the throttle while spraying the cleaner to prevent a stall.  If it does, just fire it back up.  You should be able to run with no fuel for several minutes!
15. Reassemble and ride!

Next time I have to park the bike, I will add a fuel stabilizer!