Question about 1993 Harley Davidson FLSTF Fat boy

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What do you set voes on a 1993 flhcu harley davidson

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Most people do not set the VOES unit. They simply purchase a new one that is already set by the factory. However, since the FLHCU is a heavy bike, I'd set the VOES at about 5-5.5 inches of vacuum. If the bike spark knocks when you roll on the fuel in high gear, try taking to a bit higher setting like 6-6.5. This will cause the VOES to change state and roll back the timing sooner than the lower setting. Of course, for maximum performance (fuel mileage), you should adjust it lower until you start getting spark knock and then come back up just high enough to prevent it.

Good luck

Posted on Nov 06, 2010

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1999 Harley Davidson FLSTC, starts and idels fine, any movement in the throttle and it dies. What gives. MAP sensor.

Hi Gabriel, that might be a first guess, except a 1999 FLST does not have one. It could be a faulty accelerator pump, dirt/rust in the carburetor bowl clogging the idle circuit, restricted or clogged carburetor vent line, faulty VOES, cracked, broken or missing vacuum line to VOES or petcock. If none of these usual suspects are the prime offender, you can reach me at for more suspects. Good luck and have nice day.

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I recently rebuilt the top end on my 1993 sportster (pistons, rings, gaskets). I have the engine back together and it will start but dies immediatly. It will continue to do this until the battery goes...

Unless you went into the timing cavity and moved the timing plate, the timing is set like it was before the top end overhaul and it should be fine. The VOES would not cause this problem either. You are probably correct in your assumption that the noise in the pushrod area is because the tappets have some air in them. I'd still guess that you have a fuel problem. Specifically, it sounds like you have a vacuum leak somewhere. On your Sportster, you have a Keihin CV type carb that "plugs into" a seal on the intake manifold. If the intake manifold is not properly aligned, you'll get a vacuum leak at the intake seal. If you had to push down or lift up on the air filter backing plate to get the bolts in the backing plate to align with either the bolts in the front of the carb or the two large bolts in the heads, your intake is not properly aligned and you may have a vacuum leak around the carburetor to intake seal. To begin with, you needed to put a new seal on the intake. When you install the intake, leave the four bolts that bolt the flanges to the heads loose. Then plug the carb into the intake and bolt the air filter backing plate to the carb and the heads. Once you have this done, then tighten the bolts on the intake flanges. This ensures that the intake is properly aligned. Also check the vacuum port on the backside of the carb where the vacuum hose for the VOES attaches. You must have the VOES connected or the port blocked. I'd run the VOES. It makes the engine get much better fuel mileage.

Good Luck

Sep 04, 2011 | 1993 Harley Davidson XLH Sportster 883

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I just bought a 2001 Hd sportster and noticed a disconnected vaccum line coming from behind the air filter and routed to the front of the bike. I am assuming it goes to the VOES switch but I can not locate...

Usually the VOES switch is located between the cylinders right on the top engine mount. It's a black thing with two wires and a vacuum line coming off of it. On the later models, the VOES may be mounted a bit higher. The vacuum line for the VOES and the vacuum operated petcock (if it's the original petcock) comes off the backside of the carburetor, not the air filter. If the hose goes to the backside of the air filter, it's likely something to do with the emissions system. It probably routes evaporative vapors from the fuel tank to the air filter to be run through the engine. To see what the VOES switch looks like, go to and put the information on your bike in and look under electrical section.

Good Luck

Jul 02, 2011 | Harley Davidson XLH Sportster 883 Hugger...

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I have a 1993 sportster that has died on me once and seems to hesitate from time to time.

This could be a carb issue. If it is a CV type carb, make sure the vacuum hose to the VOES is in good shape, no cracks or holes etc., make sure the intake boots are not leaking by spraying WD-40 onto the boots while engine is idling, if idle speeds up, you have a vacuum leak. If all this stuff checks out ok, you will probably have to remove and clean the inside of your carb.

Oct 26, 2010 | 1993 Harley Davidson XLH Sportster 883

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