Maintenance & Technical > KX500 Original

wont rev clean,smoking

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no sub for cubes:
hi all

i have just rebuilt my 88 kx500 engine after coming to the conclusion the crank seals had gone,the first time i started it before i pulled it apart it run great revved clean and after 2 3 times of running it started to smoke alot,sounded lumpy and would not rev clean.
Having completely rebuilt the motor new seal bearing etc i started her up first time today and exactly the same problem it wont rev clean sounds lumpy and smoking alot  :?,the kips valves are opening when its revved so i dont think thats the issue,the air screws 1 half turns out as it says in the book,i put fresh fuel in it at 40/1.

One thing i have noticed before when it was running good adjusting the tickover screw i could get it to tick over and now it wont tick over adjusting the screw does nothing i can wind it all the way in and it does nothing...


                                  anybody any ideas?

KX500freak:
maybe its carb issues ,
is the coneshaped floatpin still in good order?

if not, it allows the floatheight to rise so that can cause your issue.
it sounds to me tho its surging due to too many fuel which it can ,if the pin is worn ,
if the coneshape is not perfect  .it needs replacement .

i cant think of something else right now  :roll:

succes !

cbxracer30:
You would hate to think it but maybe the crank seal you got for the waterpump side was bad from the get go and gave up already?  It stinks when you find out you got brand new bad parts. Could also be a bad head gasket , does it right away when you first start it up?CBX

no sub for cubes:
cheers for replying guys

yes the motor bogs and smokes straight from start up,hard to belive after a full rebuild,i have replaced all bearings and seals that it given up the ghost again but like i said before i tore the motor apart with suspect main seals gone it run really sweet,just thought there might be another rational explaination for it.is their any other tell tale signs i can look for to confirm seal is leaking?


                     

no sub for cubes:
i will pull the carb off tomorrow and check that kxfreak,like i said before when it was running good i could control the tick over by adjusting the throttle screw but now it doesnt do anything  :?,it is almost like the choke is constantly on..is that a sign of the crank seals gone?

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