Maintenance & Technical > KX500 Original
Un-Burnt fuel leaking out
FuriouSly:
What up Kiwi..
The oil at the powervalve elbow is probably the oil seal for the pv arm which is on the clutch cover and usually just popped out of its seat, just push it back in or replace it. It can be replaced without removing the side case, it just presses in from the outside. It could also be the seal on the pv rack linkage that comes out of the cylinder but not likely.
The gunk at the pipe/cylinder connection is typical for the KX5. Running crappy premix, too thick a mix (32:1, 28:1...etc), too rich on the jetting, or old fuel mix (basically acts like a thicker mix because fuel losses its potency over time). There are two o-rings on the pipe which help seal the connection at the cylinder and these wear out very fast (10 hrs of use). Also on the stock pipe there is a brass compression ring that fits in the connection as well which helps with the seal and vibrations.
The white smoke is water in the combustion chamber. You probably already identified the source (water in fuel). Otherwise you would have to have a crack in the cylinder water jackets and this not that common.
Peace.... Sly
BrokenSpoke:
--- Quote from: BrokenSpoke on January 07, 2007, 05:11:50 PM ---Crank seal leaking oil into the motor
--- End quote ---
Apologies, my mistake. White smoke is water in the fuel, not oil blowing past the crank seal. Oil leaking in through the crank seal would be blue smoke. :x
c-152:
I had a 92 RMX250 that taught me (the hard way of course) not to premix @ 32:1. Every few months it would be harder and hard to start. then it started running really bad especially in the tight stuff. It became hard to start and would not stay running. I changed the jetting and moved the needle but it was useless. It was not until I tor it down and noticed that my pwoervalve was full (I mean full) of gunk. The pipe also had a lot of gunk. I cleaned it all out, put it back together, went back to the stock jetting and started running 42:1. The bike ran great after that. I am just glad to have learned that lesson on the 250 as opposed to kicking the 500 as many time as I did that 250. Unlike most people on this forum, I have not had jetting issues (I am knocking on wood right now). I believe if you clean up the powervalve and run a good synthetic oil @ 42:1 you should be okay
kiwikx500:
Cheers team for all your thoughts :-D
I did use cheaper premix oil than normal so fits with what Sly was saying the reason it is coming out of the exhaust port.
The brass ring and O rings are around 12 hrs of running old.
(10 hrs only for the O rings - no wonder the dirty 5 had none when i got it.)
Oil still comes out of elbow with synthetic oil so will look at all suggestions.
The guy I bought it off said he replaced the needle with a number 7 (pretty sure that was the size - will look around on computer history to confirm soon)
Have mixture screw set at 1 1/4 turns out
Big mystery now is where is all the gearbox oil been going that i have been feeding the gearbox - use to think when I was greener than I am now that the oil coming from the elbow was gearbox oil as it always seemed to drop.
Have read before the gearbox oil eye level glass is tricky on the KX - but even after having bike upright for 5 mins still looks like it needs more oil - must have put in a few litres over 20 hrs of use.
Can anyone tell me please how much oil the gearbox takes from bone dry to bring the oil level up to half way on the eye level glass ? Is the gearbox meant to consume oil ?
Polar-Bus:
--- Quote from: kiwikx500 on January 08, 2007, 08:59:23 AM ---Big mystery now is where is all the gearbox oil been going that i have been feeding the gearbox - use to think when I was greener than I am now that the oil coming from the elbow was gearbox oil as it always seemed to drop.
Have read before the gearbox oil eye level glass is tricky on the KX - but even after having bike upright for 5 mins still looks like it needs more oil - must have put in a few litres over 20 hrs of use.
Can anyone tell me please how much oil the gearbox takes from bone dry to bring the oil level up to half way on the eye level glass ? Is the gearbox meant to consume oil ?
--- End quote ---
OK, now I about guarantee you have a blown primary gear crank seal, which will allow transmission oil to be sucked into the crankcase and mixed/burned with your fuel. This explains the extra raw oil everywhere, and your diminishing trans fluid levels. Problem is I believe the cases have to be split to replace that seal...
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