Differences between a 90 500 crank and a 02?

[dave916]

83/   have not got  time to be using google search engine

 http://www.cmsnl.com would prove that crank part no are the same from 89/04

1989 e1 rh crank half http://www.cmsnl.com/kawasaki-1989-e1-kx500_model11971/crankshaft-rh_130371359/#.VK2JJiusVB0
2000 e12 rh crank half http://www.cmsnl.com/kawasaki-2000-e12-kx500_model11993/crankshaft-rh_130371359/#.VK2JoyusVB0
same part no on both part  and no holes in 89 [SAME CRANK}

complete crank will have differant part numbers due to rod and big end bearing changes

and i have checked load of them on the bench
89 no holes


88 with holes same weight

[motopunk]

the bike on this pic is brad lackeys full factory kx500 sr 1980/81  1982 he was the 500cc worldchampion, but on suzuki ...

[dave916]

my infos come from my kawasaki dealer, here from the site, and there:  http://www.cmsnl.com/kawasaki-kx500_model11963/ and if you know how to use google or another searching mashine, you find a lot more facts about the big green beast...

 so you say my infos are incorrect?? i have to say, you have to do your home work much better !!
 i dont spoke of the circlips on the crankshafts because i thought you know what we talk about here...  

 if you change the cranks you always need the primary gear from the same years like the crank (only diference in the gears is the mounting to the shaft)
  the heavier crank came in 92 because of the most people that used it for offroad and to bring more torque to the powerband in addition with the bigger statorplate and flywheel..
 83-91 cranks have holes, that the 92-2004 dont have...  
change in the cases is for the evolution of the powervalves 83-85 no powervalve, 86-88 has 2 vertical powervalves = 2 holes in the cases for the valve-shafts, 89-2004 became the mainvalve added ,so that are now 3 valves in and 3 holes in the crankcases ....83-88 have also a shorter second gear , that would changed in 89 (i have the newer longer second gear in my 86 kx500 engine) all other gears and shiftforks are also the same parts 83-2004 only the shafts would changed for another splining in the clutch hub . 83-87 have also different mounting for the countershaft-sprocket  (big nut)  88-2004 with circlip...

why you think the cases would be changed for a heavier weighted crank?? from where comes your knowledge??

  its the same part numbers 89-2004 only real difference between 86-2004 is the change of the clutch actuation in 88 and the 3rd hole for the exhaust valve since 89...  last week i had a 2002 motor on the bench for replacing some damaged transmission parts... so it was side by side with my 88 engine...  i have also complete 88 and 86 transmissions in spare and i know each screw on my bikes.  

now you again dave...   maybe do you want also share some knowledge about the kx250´s ??

and question: what year kx500 is this on the picture ??

now i´m excited for the answer  

it looked like it got a disc brake up front on that picture / kind i threw me to a later year

did u check the info info on cranks, still saying they when heaver in 92?
And i know Nothing about 250s or pre 85 500s

[motopunk]

this bike is full full factory worksbike  as the kx420´s in1980-81 were sold to the public... you see the unitrak1 linkage with 2 vertical dogbones and the tokico disc brake that came in 82 to the kx125 and 250   ...

 i ride and race kx 250´s and 500´s since 20 years now... but my first 500 i owned in 2011...

here is a very good article of the kx500 history...
http://dirtbikemagazine.com/industry-news/the-life-times-of-the-kawasaki-kx500