Maintenance & Technical > KX500 Original

started smoking and no idle adjustment.

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KX500freak:
i checked a buddy who is racing cr5
he told it,s definately crank seals
dry one causes high idle
wet one lets oil flow back n forth ,causing smoke,
and causing fs seal to leak due to clogged drain .
they were not new seals i think  :roll:

no sub for cubes:
cheers for the replys guys

ive looked behind the fly wheel cover to check for oil residue as i read on here  this was a sign that the dry seals had gone and its completely dry in there...when i say its idling bad i means its surging on idle not really high just not healthy....and adjusting the idle screw did nowt it still ticks over when its wound out,something i did fail to mention which prob does have some relavence is the gear box seemed to go really tight hard to select a gear and then freed up again,after that it started smoking badly and ive noticed oil leaking from the sprocket...i really need to pull the sprocket off tomorrow and confirm.as for the plug i pulled it out still looks pretty clean but again not really run it alot since build.
So is there signs to look for the crank seal gone? i need to do a bit more investigating myself to give you guys a bit more info but really appreciate the prompt replys


                                          cheers
                                               simon

Jopiz:
A crankcase pressure test should be performed after a rebuild. It will show if something is leaking. Block the exhaust ( can be quite tricky because of the powervalve) and pump pressure trough intake. 5 psi is good. Normal pressure loss is one psi per minute, so the pressure should last about five minutes.

Edit: The flywheel side seal causes engine suck in air when seal is damaged or failed. You can test it by putting some babypowder over the seal and kicking the bike running. If it gets wet or dissappears you've got a bad seal.

-J

no sub for cubes:
cheers jopiz

its looking like the crank seals gone on the wet side the symptons are as kx freak described smoking like a  ***** and oil leaking from fs......wounded!! but i will defo look at doing a leak test before i pull it apart!
 Well you live and learn not to rely on other peoples integrity,i should of had a proper look over the motor before dropping it in.


                              much appreciated guys

                     great site and great people willing to share knowledge

KX500freak:
simon ,i learn all the way too here.
that,and the chance too try help one fellowkxrider out,
is the essence of kxriders imo :)

so pleasure,s al mine here and good luck on the repair !!
keep us posted  :wink:

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