Bit of both harry main jet
Solex's are easy to adjust when compared to other Porsche induction systems. But they are much harder to adjust than American two barrel carburetors. It takes a certain feel. While the carburetors are out of the car, fill them with fuel by pouring it into the "pipe" in the center of the carb. This accomplishes two things: Buy a plastic nose dropper from a local drug store and discard the rubber bulb. Glue shut the small end with super glue or a hot clothes iron. Bit of both harry main jet the side of the vial near the big end and attach about 6" of small wire as a handle.
From a local swimming pool supply company or Home Depot buy a small 2" bottle of red or yellow chlorine or pH testing chemical.
When turned completely upside down 1 drop of either chemical equals 0. Mark your new vial accordingly. Place the vial in the throttle bore under the squirter to catch the gas as it comes out of the accelerator pump nozzle. Check manual for correct amount of fuel per stroke -- sometimes it's more accurate to use a number of strokes and divide by the number of strokes.
When stroking the throtle, open the throttle smartly and hold open until squirting has stopped before attempting another stroke. The injection quantity can be varied by adjusting the length of the bit of both harry main jet using the nuts on the accelerator pump adjustment threaded pull rod Many believe that the factory settings are too high for todays gas, and can cause a flat spot upon acceleration.
You may want to experiment with using a somewhat lower volume. One more thing to do before you install the carbs. Go ahead and make the initial adjustment of the mixture screws These instructions start with the engine thoroughly cleaned and manifolds installed with new gaskets. The linkage should be clean and high temperature grease added to the ball sockets. An 8mm open end wrench can be used as a ball joint separator.
New gaskets are used between the manifolds and spacers and between the spacers and the carburetors use only genuine Porsche or equal gaskets. A new gasket should go between the carburetor and the air cleaner. Next the linkage should be hooked up, except for the short ball jointed pull rods. Find the idle stop screws and turn them out until the throttle plates rest against the throttle bores. Now adjust the pull rods so that they can be snapped on without disturbing the throttle setting.
This should give the carbs side to side balance. Now snap on the pull rods. Oil the throttle shafts and accelerator pump linkage and redo everyb miles and check for smooth operation. Next, have someone get inside the car and floor the gas pedal while you are looking into the carbs.
This is to make sure that the throttle plates open all the way to vertical but be sure they don't go past vertical. You can now hook up the fuel lines. Don't forget the filters.
The German VW Bit of both harry main jet 3 fuel hose is safer than the stock hose. Be sure to check the metal lines for wear if they rub on sheet metal, etc. Adjust the fuel level by means of the float level adjustment screw 10 immediately above the accelerator pump block.
Loosen lock nut and turn in to lower fuel level, turn out to bit of both harry main jet the fuel level. You should take your time with this as the bowl is large and it takes a while for it to stabilize. When turning in the screw, do so slowly, as you may bend the elevator if you go too fast. Lock the adjusting screw when finished. After setting the fuel level, don't forget to remove the jet from the tool and install it back into its carrier.
There is a small bolt located at the top middle of the fuel bowl, on the side of the carb facing the engine. Carefully remove this bolt good idea to put a rag underneath as it's easy to drop and easy to lose. If no fuel drips out, then you turn out the float level adjustment screw 10 slowly to increase the level of fuel in the bowl. At some point a bit of fuel will drip out of the bit of both harry main jet. At that point, turn the float level adjustment back in just to the point where fuel no longer drips out.
If the engine doesn't respond when you turn one of the mixture screws in and out, it means that the cylinder is not getting ignition, or it is not getting mixture. If the ignition and compression check out, then an idle passage is plugged. Remove the mixture screw and spring and blow comopressed air into the mixture screw hole to clear the obstruction. DO NOT blow into the top vent.
If this doesn't work, then the idle passage bit of both harry main jet need to be "boiled out" or the passage checked bit of both harry main jet a duct gauge. Split-Shaft Carbs Adjust the other barrel of the carburetor to an equal vacuum using the small screw below the fuel bowl and between the throttle bores. Solid Shaft Carbs You must hold the throttle lever and by means of a 5MM open end wrench on the forward end of the shaft and twist shaft in appropriate direction to create equal vacuum.
Be sure the throttle is open a small amount when twisting shaft so as not to jam the throttle plates in the bores.
Sometimes as you turn the screw out, it speeds up the engine enough to advance the timing, which adds RPM. When you turn the idles screws bit of both harry main jet a hair to correct this, the weights in the distributor flop back, which slows the engine. This may mean that you need bit of both harry main jet distributor rebuild.
It's best to get your initial adjustment around RPM and hope the distributor doesn't intercede. Be sure to check the side to side balance each time you adjust the idle screws. Toggle navigation Porsche Registry. The injection quantity is checked with a narrow CC measuring vial. You can purchase one of these from Porsche, or you can make one yourself using an old bit of both harry main jet fuse.
Remove the top of the fuse, solder a paper clip or piece of wire to it, and you have a working device. Another Cheap Measuring Vial Buy a plastic nose dropper from a local drug store and discard the rubber bulb.
Submitted by Tony Ryan.
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