Question about 1993 Harley Davidson FXR Super Glide

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1993 harley davidson when u get around 3000 rpm i hear a rattle i think in the top end it is louder when i let off on the gas

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What grade of gasoline are you running? I run only high octane fuel to prevent spark knock which is what you may be hearing.

On your Evolution engine, you have tappets, rocker arms, and pistons that could be source of your noise. However, most of these items will make a noise from idle RPM on up. At about 25 to 30 thousand miles, Evo engines have a nasty habit of losing tappet rollers. The make a very loud noise when they go bad. The roller locks up and usually destroys the camshaft as well.

Now there is one thing that could be making your noise at 3K and up. If you or someone else has put a set of "torque cones", "power cones", or "anti-reversion cones" in the exhaust pipes, these may be the source of your noise. You'll just have to try to narrow down the area that the noise is coming from.

Good Luck

Posted on Aug 04, 2010


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Disconnect the stator plug from the regulator. Have your meter in Volts AC. Start the bike and watch the meter readings. typical output is 25 volts AC per 1000 rpm. So at 1000 rpm it should read around 25 VAC. At 2000 rpm it should read around 50 VAC. and finally 3000 rpm should produce around 75 VAC. Could be a little lower which is common.

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Hi Wattebrent, I'm sorry but I just loaned my listening ears to the lead technician at your local Harley Dealer so he could take your bike for a test ride and evaluate the noise. Good luck and have a nice day.

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You must be talking about the anti-rattle spring. I do not know how to explain to you how this spring goes back on. Go to this site and it will show you the spring but you'll still have to figure out how it goes on. You may have to look at another Softail to see how it goes on. The brakes will work without the spring on there but the pads may rattle.

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Hi, i have 2001 road king classic. at about 50mph and 3200 rpm i hear a rattle down by the shifter goes away when i put it in the clutch. do you know what is causing this? left side.. its not any loose...

Steve, when is the last time you adjusted your primary chain? If the chain gets too loose, you'll hear a rattle like that when you let off on the gas. If you pull in the clutch, you must let off on the gas to keep the engine from over revving. This is about the only thing I know of that could be causing the problem.

But, just to be sure, I'd drain the primary case and remove the outer primary cover. Disconnect the battery, remove anything that might be in the way. You'll have to remove the oval shaped inspection cover as well. Remove all the bolts and take the outer primary off. Then, you can adjust the chain easily. Adjust it so you have between 5/8" and 7/8" up and down play in the middle of the top run of the chain. Look on the inside of the primary underneath the top in the front at the bolt hole. You can see if the chain has been hitting there by the marks on the underside of the inner primary.

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I'd wait for the dealership. If you go messing with it, they can claim that you did something that voided any warranty the bike may have had. Let them fix it. You'll be better off that way.

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At 1900 to 2100 RPM the engin shakes and rattles. It is in the engine and sounds like it is lifters. How can I check and fix?

How many miles on the engine? Are all the tappets rattling. If all the tappets are rattling, you don't have any oil pressure. If only one is making a loud noise, you've probably lost a roller on the end of one of the tappets. I think a '93 model was one of the engines that had the cheap INA inner cam bearing. Previous models had the Torrington bearing and after '94, they went back to that bearing. I could be anything.
But, it it sounds good below and above this RPM range, it's probably motor mounts. The FXR had the small rubber engine mounts. Check the front one first as it's fairly simple to check. The rear engine mounts are on the through bolt that holds the rear of the transmission and swingarm in. You have to pull the swingarm out to replace these.
Look for something loose first and then move to more complicated things.

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At cruising speeds above 50 mph on my 92 harley, i hear a rattling sound in the engine, like a hot air corn popper where the kerrnels are bouncing off the side walls of the popper.

Sounds like detonation ( aka engine knock ), Switch to premium gas. If the knocking continues after the first tank of premium then go to the dealer and ask for spark plugs one heat range colder than the stock plug for your bike. This should fix the problem.
I hope you can rate this solution as a 'FixYa'.

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