Maintenance & Technical > KX500 Original

Vibration Reduction

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Motoroost1:
What kind of foam ?

Polar-Bus:
Here's my secret recipe for minimal KX500 "body buzz" .  Stuff 5/16" automotive fuel line inside the bars, grip the bike more with your thighs, and ease up on your handlebar "death grip". Take 4 advils before you ride.  Gel palm street riding gloves.

2-Stroke Tom:
My crank is trued and balanced, but my 500 still vibrated more than any 250 I've owned. When I bought my ex Team Green 500, I asked the mechanic about this and he just said that crank balancing will reduce vibration, but the KX500 will always have some vibration.

My solution: I tried vibranators (If interested, I have  a picture before I installed them). They made a noticeable difference, especially when I would ride for prolonged periods. My friend rode my bike back to back, before and after the vibranators and he could tell the difference just puttin around on the street.

alward25:
Well, let's price out a few things.  Bottom end overhaul, assuming your top end is all in good shape and just need gaskets, approx prices :

Rod kit- $90
Labor to install it- $50-$75
Cometic Engine gasket set with main seals- $50
Main Bearings- $30

So, about $220 if you don't replace all the other seals, $235 if you do.

Assuming your plating is in good shape....
Wossner Windowed Piston kit STD bore- $180 
OEM wrist pin bearing- $10

There may be other odds and ends you would want to replace, but they are usually pretty cheap but could run as much as $50-$100
So, complete engine overhaul less than $500 if you can do all of the work but the crank.

My cost on Fasst Flex bars is $270 plus shipping.  another $50 if you want the anti-vibe inserts. 
Conclusion, Buy bars to mask a bigger problem, or tear it down and freshen it up.  Both would not hurt :evil:
Oh, don't forget an MZB to power your fire your steed for $550 :-D

Alex

Motoroost1:
Well , every shop in my area charges $80/hr + tax and and to split the cases and install a crank , you are looking at about $400 just in labour . It is $275 just to split the cases here . Every other part , crank kit , bearings and seals are extra . Machine work to true the crank is extra on top of all that . So , this is a pretty expensive proposition if you can't do the work yourself .

Not even remotely feasible if the engine is fresh and vibration is the only issue . This is essentially where I'm at . The motor seems fresh with good compression and lots of power . It has a brand new cylinder and Wiseco piston . So , for simple trail riding , I will try a few basic things to help the numb hands issue . If I can reduce it to a resonable level , I will be happy . If not , it will be what it will be . It's not the end of the world by any means . I will adapt and move on .

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