Maintenance & Technical > KX500 Original
01' 5 hunny vibratin'son of a gun
c-152:
I had heard about the vib problem when I first got my 500. Everyone told me I was going to hate it but I honestly to not notice it. My bike has Renthal bars on stock mounts and my pegs are stock as well. Mine is a 92 as well (maybe a good year at the factory) and I have seen no need to plunk down a bunch of money for it. I know this might sound stupid but if I were you I would just try to go out a couple more times to see if you get used to it. That is unless you have a bearing or crank issue and the vibs are so bad they are causing damage. In that case I would tear into it and replace the bearing and true the crank (might as well since it will have to be torn down)
billygoat500:
you wanna talk vibration/ My yz-490 was the last bike that i usaed to ride. I still have it but but have upgraded to a 5 hunny. The vibtation of the is like comparing a Jaguar to a 3 ton truck. It took Quite a lot of work to get the vibration down to an acceptable level.
Mounting the bars solid to the tripple clamp and filling them with clear silicone helps a lot. Make sure thet the steering head bearings are adjusted and not worn. Just changing to a better handle bar makes a diff. Stock bars are garbage. All motor mounts and bolts tight. Loose fuel tank is often over looked make sure that it is tight. With above mentioned mods and all things in propper working order my bike is a dream machine,luxury big bore.All I have to do is hang on tight.
Mick:
Yeah it does seem to be a leap of faith as to how close the crank is trued and balanced. Seems the factory allows for so many grams one way or the other. Sometimes you luck out and the crank, rod and piston happen to be just the right weight...sometimes you don't *shrugs* It'd be nice if you could walk into a storage closet full of engine parts and weigh every piece before you bought it. My '89 was bad, real bad. The kind of bad that s**ts bolts every ride.
hillclimber147:
--- Quote from: Mick on April 14, 2007, 03:25:28 AM ---.......The kind of bad that s**ts bolts every ride.
--- End quote ---
:-D :-D :-D :-D Been there, done that. Bike of course. Not me!
FuriouSly:
IF you have replaced a piston, then your crank/motor will more than likely be out of balance. Even motors from the factory are usually out of balance, definately hit or miss. Weighing the piston/rod assembly (rotating mass) and matching them to the crank to minimize rotating imbalances is the major way to reduce engine vibrations. Of course that takes money and a builder to do it.
If you have enough vibration that your hands are going numb... that is probably tearing your motor (bearings, seals, mounts, etc.) and frame apart. Bolting stuff on to reduce vibs (bars, mounts, lead, silicone, etc.) is good, in my opinion if you have already balanced the crank. Putting $ into the motor will make the motor, frame, parts mounted to the frame last longer.
I have had the crank balanced/welded when it was ported/rebuilt, pro-tapers, solid bar mount triple top clamp, siliconed the pipe brackets, and rebuilt the pipe mounts. IT still vibrates!! Granted alot less than when I first started, but that was stock. After rebuilding it and you go with more compression.. more vibration.. its a relationship you can't avoid. I have a much stiffer suspension now and that increases vibes as well. So, it is probably back to a medium vibration KX5.
I think the best thing that I have found to help reduce vibration is... Ride in the SAND !! Like a giant sponge to help soak up the vibes...
Sly
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