Question about 1993 Harley Davidson FXR Super Glide

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I need to know how to find the timing marks on a 1993 H-D FXR. The first cylinder is mis-firing. It will only idle with the choke fully pulled. I have pulled the carb apart to see if there were any issues but none were found and replaced the intake gaskets. I am running out of ideas other than the timing being off.

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Your problem is not with the ignition timing. If it were, both cylinders would be misfiring since both cylinders would be out of time. I'd suggest running a compression test on the engine. Compare the reading of the misfiring cylinder with the other cylinder. There should no more than 10% difference. But, the clue to the problem is in your description of what your bike is doing. You say "It will only idle with the choke fully pulled". This is telling me that something is wrong with the carb. I would say that your slow speed jet or the some of the fuel passageways to the idle port of the carb is stopped up. If you're still running the stock carb, with the float bowl off, look at the main jet that is screwed into the main jet holder. Off to one side there is a hole with the slow jet screwed into it. The jet is deep in the hole. Using a narrow bladed screwdriver take this jet out. Hold it up to the light and check to make sure it's open. Also, find the idle fuel port on the bottom side of the carb throat on the engine side of the throttle plate. Get you a can of that pressurized carb cleaner and put the plastic straw into the nozzle. Put the straw into the hole where the jet came from and squirt the carb cleaner into the hole while watching the idle fuel port. You should see the carb cleaner come out the port. If not, the passageway may be stopped up. If this is the case, you'll have to drill the anti-tamper plug out of the carb and remove the idle mixture screw to clean the port out with a direct shot of the carb cleaner. If you are not familiar with the carb and what I'm talking about, you'd be better off to take the carb to someone that is thoroughly familiar with the carb. If you want to attempt this yourself, with the float bowl off, look just to the rear of the float bowl for what looks like a round plug directly below the idle fuel port. Using a small drill bit, drill through the plug. Just drill deep enough to go through the plug. The brass idle mixture screw is under the plug and if you drill too hard, you'll damage the screw when the drill goes through the plug. Once you get a hole drilled in the plug, thread a small screw into the hole and pull the plug out. Then you can access the idle mixture screw. You can take the screw out but be careful not to lose the very small washer and the o-ring in the bottom of the hole. Spray the carb cleaner directly into the hole and make sure that it is clear. When you reinstall the mixture screw, put the washer and the o-ring on the end of the idle mixture screw and start the screw into the hole. Turn the screw until it gently bottoms out and back it back out about three turns. This is a good starting point. When the engine warms up, adjust the idle mixture screw for the highest, smoothest idle.

Good Luck
Steve

Posted on May 25, 2011

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