Show me how. My bike is loud enough I returned it to dealer @ mile 260 for Honda to address a vibration rattle in front 4x4 final gear. The guy behind the counter (and not a mechanic) rode with me and said to change the front gear oil.
They will call me back in 3 weeks to see if the noise persists and to bring it in.
Best I can describe is a backlashing sound when the fronts and rears are turning at the same speed (or perhaps, not turning at exactly the same speeds).
So I'd be VERY interested to know more about front oil differentials and changing.
Thanks!
You will need to buy one quart of good synthetic gear oil. Refer to your owners manual for the specs. It calls for 80w-90 GL-5 I believe, but verify that for yourself. You will also need a small plastic hose (around 1/2" OD) and a foot or two long. It needs to be somewhat flexible and attached to a funnel.
Drive your machine around for 15 mins or so to warm the oil.
Then remove the fill plug - it is located on the drivers side of the differential. Remove that first because if for some reason you can't get it out, you'll have no way to refill the diff. get a drain pan for under the diff. Remove the drain plug. It is located on the bottom of the front diff and you can access it without removing any (factory) skid plates or the bumper. I can't remember for sure, but I want to say it was a 15mm hex. Let that oil drain out for at least a half hour before re-installing the drain plug. If you can, just let it drain overnight.
Clean the drain plug and re-install it. Make sure you do not over torque it. Now you need to stick that plastic hose into the fill hole. if you look in the hole, you will see the ring gear. You need to push the hose in a little bit past the ring gear or the oil will come out of the fill hole instead of down into the diff. Pour the oil in SLOWLY. It should take a little more than half a quart, plus whatever you spill. Fill it until the oil starts running out of the fill hole. Re-install the fill plug, being careful not to over torque it. Clean up the mess and ride it.
It really is a very easy process as long as you make sure you have a plastic hose so you can get the oil in the diff.