Question about 2004 Harley Davidson FLHRS - FLHRSI Road King Custom

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The compensating sprocket cover is loose and rattling

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Your looking at 150 ft lbs on the Nut. Use red Lock tight.

Posted on Jun 27, 2009

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Tighten it.

Posted on Jun 06, 2009

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1 Answer

Does compensator sprocket stay lose after large nut is tight ? on 1340 evo motor


With primary chain loose, there will be a LITTLE back and forth play on the compensating sprocket.

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Engine developed a bad vibration, can this be the compensator sprocket


I would check all the motor mounts. A loose compensator sprocket would give a knocking noise more than a vibration.

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Bad Rattle from Primary on a 97 HarleyFXSTC, replaced comp sprocket still bad rattle


It might be worth checking the chain alignment before you strip any further. If the chain is not aligned correctly it will rattle or if the tension is not correct. I hope this helps.

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Noise primary chain flap contacting inside cover when powering up all gears 2011 dyna wg


Remove the primary cover to see what the problem is. Chain adjuster could be broken, or the compensating sprocket may be loose.

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2008 Road King Classic, rattle from primary


Chances are either the nut on the compensating sprocket is loose or the primary chain is loose.

Jun 20, 2012 | Harley Davidson FLHRC Road King Classic...

1 Answer

I have a knocking noise under the primary cover that comes and goes ~ any suggestions as to what it is????


It's probably the compensator sprocket. Drain the primary and take the cover off. Check to make sure the engine sprocket nut is not loose. It should torque to 150-165 foot pounds. Check the adjustment of the primary chain. In the middle of the top run, it should have 5/8 to 7/8 inch up and down travel when the engine is cold.

The compensator has a "spring cup" on the outside where the nut is. If you can turn this cup by hand when the nut is tight, the springs inside of it have lost their tension. The cup must be replaced.

Good Luck
Steve

Aug 08, 2010 | 2001 Harley Davidson FXDL Dyna Low Rider

1 Answer

On the left hand side of my bike behind the covers of i think gear box starting to make a nasty noiseits a year 2000 night train model


Well, you didn't tell me under what circumstances it makes the noise so I'm going to assume it makes the noise constantly or pretty near so.

There are several things that can cause this. The primary chain needing adjusting is the most common. If it gets too loose, it will run the inside of the case at the top front. To check the tension, remove the oval inspection cover. The top run of the chain should have 5/8" to 7/8" up and down play in the middle of the run. To adjust, loosen the nut on the shoe and move it up or down.

Also the sprocket shaft nut that holds the compensator sprocket on could have come loose. This nut requires quite a lot of torque and if someone has worked on it and didn't get it tight enough, I've seen them come loose and the nut rubs on the inside of the outer cover. Drain the oil in the primay and pull the outer cover off. If the nut is loose, remove it and put two lines of Loctite #271 (red) in the nut and retighten the nut to 150-165 foot pounds of torque. You must have a way to lock the primary up and keep the engine from turning to get this much torque on the nut. We use what is known as a locking bar that fits in the sprocket teeth of both the compensator sprocket and the clutch hub.

The other thing is not enough oil in the primay. It should have between 36-42 ounces of oil in the primary.

Good Luck
Steve

Jul 25, 2010 | 2000 Harley Davidson FXST Softail Standard

1 Answer

Have noise in front of primary only with passenger on bike in second gear knocking clattering sound from


Sound like a loose Compensator nut.

The compensator nut is the part (the nut) that attaches the front sprocket to the motor crank.

When a cylinder of a v-twin fires there is a very strong power pulse. To keep from shaking the bike and rider apart these pulses have to be "smoothed" out. Harley does this by NOT solidly attaching the front sprocket to the engine - they use a "compensating sprocket".

A crank shaft extension, double sprocket, sliding cam, and a stiff spring together form a "compensating sprocket". When a cylinder fires, the power stroke is smoothed out by the action of the compensator cam and springs.

The compensator nut is what holds the compensating sprocket assembly on the crank.

There are a LOT of forces acting on this nut and sometimes the nut loosens up. A loose compensator nut results in a compensating sprocket that can move laterally on the crank. A loose compensator nut therefore is one potential source of engine vibration.

Harley-Davidson issued service bulletin a while back that changed the procedure for tightening the compensator nut, after a spate of bikes had problems with this nut working loose.

Check with your local Dealer to get the correct torque spec and procedure for your year bike.

Mar 23, 2009 | 2003 Harley Davidson FXDWG Dyna Wide Glide

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