Question about 2005 Honda XR 650 R

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Noise from gearbox near front sprocket.

Hi I have a 2000 model XR 650R and there is a wirring noise coming from the gearbox behind the front sprocket at about 80kms under a bit of load it goes when I back of it seems to be vibrating a bit as well.

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Your bike may need the harmonic balancer chain adjusted. Th will notice is noise is very prominent at engine idle and low RPM's. When this chain get lose you will feel the vibration even in the handlebars if it is loose enough.

Posted on Dec 07, 2008

  • Rob Selvy
    Rob Selvy Dec 08, 2008

    Gosh after rereading this post I realized you may be losing the output shaft bearing. This is the bearing next to the counter shaft sprocket. I'd still check the balancer adjustment but you could be losing the output shaft bearing.

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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.

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