2004 kawasaki kx125 PROBLEMS PLEASE HELP!!!

how do i do the tests??  

start with the simplest first. Do a compression test. Never trust a seller, unless you have known him a long time and then be careful.  
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"Every time I start thinking the world is all bad, then I start seeing some people out there having fun on motorcycles. It makes me take another look." -Steve McQueen

you buy a leak down tester & put it in your spark plug hole then plug your exhaust off at the head & plug your air/fuel intake manifold off & pump it up to 6psi max & it dosent hold 6psi for atleast 10 min or so you need to check all you plugs inculding the tester connection & that the part in the pug hole isnt leaking because its not tight enough with a soap water solution & if you find a leak plug it off all the way & then do it agin if it drops fast agin pull your side cover & clean up the inside & put the soap water solution around the crankcase gaskets & if they foam your seals are bad also put it around your head & cylinder where the meet the cylinder & cases to see if they are leaking. with the head & cylinder just because it dosent foam dosent mean there not leaking. drain your oil if its leaking down & see if its got water in it. this will appear as a milky gray crap in your oil. if you have done that & your equipment isnt leaking one of your seals are bad & you need to pull the motor apart. also if either of the crank case seals foam youll have to tear your motor apart & replace every gasket in the motor. if its leaking around the head or you find water in your oil you just have to pull the head & cylinder as you should imop replace both head & cylincer gaskets at the same time & make sure to put new rings on the piston. this should solve you problem. if it passes all of these test & passes a compresion test it has to be your jetting. but i seriously think its your crank  seals
DavidS  
i take a lot of pride in what i am

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ride: 02yz426
local: north east Oregon

terrain type woods with lots of roots & rocks

the Leakdown tester costs 271$ try to rent one.
I would just pull the clutch cover off, remove clutch basket and have a look-see at the main bearing seals.
As for the topend, use a compression tester, but you have to fix the radiator & Kickstarter first.
  Almost all used bikes have issues, you just gotta fix em, One at a time.  
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what!!!? there that much jeezz glad i have one!
DavidS  
i take a lot of pride in what i am

___________________
ride: 02yz426
local: north east Oregon

terrain type woods with lots of roots & rocks

You can make a leakdown tester.

GET THE RAD FIXED. Trust me. I had the same issue. I got mine welded I thought it was fixed until 3 rides later its gushing coolant out everywhere. It's going to keep getting worse until you get it fixed. You can get it fixed at a radiator shop for 25 dollars.

The oil coming out the exhaust could be a bad crank seal, worn top end, or bad jetting. You really do need to do a compression test and a leakdown test. To find the problem. The kickstart thing is odd. It could just be because the top end is worn but it might be a worn kick gear.  

i went out there and it started then stopped running and still leaked oil under the bike??i say it ran for about 3seconds  

you need to do all of the above mentioned things & then come back & tell us what the out come is
DavidS  
i take a lot of pride in what i am

___________________
ride: 02yz426
local: north east Oregon

terrain type woods with lots of roots & rocks

i did a compression test its 145lbs  

ok so your top end is good you need to check your crank seals still though. im starting to think that the spooge is because your bike is horible horible lean that is my new theory so check your cranck seals. it may be worth it to just have a shop that you trust & have them do a leak down test.if it passes that a retard must have jetted your bike. ill have you know that the info i am giving you is from threads on here & books & magazines i have read
DavidS
DavidS  
i take a lot of pride in what i am

___________________
ride: 02yz426
local: north east Oregon

terrain type woods with lots of roots & rocks

Sanders your off base...by a lot.

Your top end needs rebuilt first off. 145 is at the service limit.

Lean doesn't cause spooge. Rich and bad crank seals cause spooge. The leakdown test needs done so you can find out if your crank seals are good. If it passes the leakdown test then your problem is your jetting.  

ummmm elk last time i checked if you put the jets out of a kx500 in his 125 it would have to have been jetted by a retard.  & duhhhhhhh who didnt know rich jetting caused spooge if they didnt they either 1 havent been riding 2stks long or 2 umm i dont even think theres a second reason.
my manual says down to 135 so who knows what a kawi manual says
DavidS  
i take a lot of pride in what i am

___________________
ride: 02yz426
local: north east Oregon

terrain type woods with lots of roots & rocks

Stop being so *** contradictory. You just said this. " im starting to think that the spooge is because your bike is horible horible lean that is my new theory so check your cranck seals." and now your saying that rich causes spooge. What are you even talking about with kx500 jets in a 125.

He has 145 psi, that is borderline so why would you tell him its fine.  

ohh *** i typoed that i ment rich srry. its 10psi if the service limit is 135 that is 10psi above service limit. & besides with the amount of ether it sounds like he has dumped through his bike when he pumps the leakdown test it will probably blow the crank seals. which need to replaced just because he put ether in it in my opion
DavidS  
i take a lot of pride in what i am

___________________
ride: 02yz426
local: north east Oregon

terrain type woods with lots of roots & rocks

Sanders your bike is almost 20 years old. These bikes run higher compression engines.  And 10 psi isn't that much. He could go out riding one time and see it dip to 135. I got about 50 hours on my bike this summer and I have 125 psi on it right now. My entire top end was brand new going into the summer.

It needs rebuilt. When you wait is when other things start to get worn too. It should be rebuilt now because it's going to need rebuilt very soon. The point of a service limit is so you can rebuild it before it reaches the service limit. You can't rejet a bike too if the top end is worn.