Chucking oil out the back?

[FROSTY:Me]

Just aquired a 97 KDX200--all hotted up-hot pipe etc.
Last owner was running 35-40/ one oil
It sounds fine but its chucking good gobs of black oil out the back
Methinks theres a bit of unburned oil sitting in the chamber.
Ida thought unlikely to be oil ring

My thought is to bung some 45/1 in the tak and take her for a bloody good thrash
Could I have misssed summat here?

[Katman]

Ida thought unlikely to be oil ring

Ida think the same.

It's possible it could be sucking transmission oil past the crankshaft seal.

[Danger]

My thought is to bung some 45/1 in the tak and take her for a bloody good thrash

What are you hoping to achieve by doing that? It will still chuck oil until you replace the packing in the exhaust and sort the jetting out. In fact it will run even richer at 45/1 with the same jetting.

[FROSTY:Me]

Ida think the same.

It's possible it could be sucking transmission oil past the crankshaft seal.

Yep I did wonder about that

What are you hoping to achieve by doing that? It will still chuck oil until you replace the packing in the exhaust and sort the jetting out. In fact it will run even richer at 45/1 with the same jetting.

if not as katman said I thought one possibility is that the bikes been run at low RPM with too much oil for awhile and has oiled up the pipe--a good run with the right mixture and if its stopped pumping oil I know whats happened.--The last owner was er intimidated by the bike

[Danger]

Is it blowing heaps of white smoke? Thats a sign the crank seal has gone I believe (I've never personally blown one).

What I'm trying to say is if its been blowing oil out the back all the exhaust packing will be oil soaked and it will continue to spit oil until its changed, you will not burn it off as the exhaust gasses are too cool by the time they reach the muffler. You will make it worse richening the mixure by decreasing the oil content. More unburnt fuel will make its way through the expansion chamber and out the muffler and carry the oil thats within it. Unless you change the jetting and replace the muffler packing it will continue to spit oil.

[riffer]

Why not eliminate the whole issue by removing the pipe, filling it with petrol, leaving it sitting for a while, then pouring most of it out, then setting the rest on fire?

Used to work for me when I was a teenager. Have things changed that much?

[Pedrostt500]

I used to have to clean out two stroke exaust pipes for farm bikes, that had gummed up from mostly alot of low rpm running, by using Oxy Acetalene tourch, you have to be carefull not to blow holes in the exaust pipe, it will require repainting after this though, and it is not as easy as it sounds it does require a little skill to do.

[Kickaha]

I used to have to clean out two stroke exaust pipes for farm bikes, that had gummed up from mostly alot of low rpm running, by using Oxy Acetalene tourch, you have to be carefull not to blow holes in the exaust pipe, it will require repainting after this though, and it is not as easy as it sounds it does require a little skill to do.

If you do it correctly it is quite possible to create enough smoke that the neighbours from a couple of houses down might wander up your driveway to make sure your house isn't on fire

We used to use the oxy torch to get all the crap burning, then use a air duster to blow through at the same time, very good results

[Ktmboy]

What are you hoping to achieve by doing that? It will still chuck oil until you replace the packing in the exhaust and sort the jetting out. In fact it will run even richer at 45/1 with the same jetting.

Too true. This only richens the mixture.

Jetting or maybe a change to a good spark plug would be the go, couple with a muffler repack. Easy things first.

Its still running OK tho isn't it?

[Ixion]

Start easy hot, and idle reliably when hot ? If so, unlikely to be a blown seal
Fiddling around with the oil ratio won't achieve anything (except maybe seize it)


You might want to check that oil ring though, I have heard rumours that there were some of that model , there was a massive cockup in manufacturing and they completely forgot to fit one. Could account for your problems, eh.Just drop the pipe, and have a squizz up the exhaust port. while slowly turning the engine. If you don't see an oil ring, bingo. Hot foot it down to the Kawasaki agents and tell them you want a replacement piston WITH OIL RING, pronto. Don't let them put you off with cock and bull stories, it's just Kawasaki trying to keep their stuffup secret.

Otherwise, how much do you hate your neighbours. Oxy torch, set the zorst on fire then feed in oxygen and watch the pretty red band move down the pipe. Or, the pipe melt in half as the case may be. Alternatively you can poison half the neighbouring watertable with caustic soda. Just make sure that kids are kept way way away from either method. And watch the caustic it can be really nasty stuff.

But have you tried the simplest solution of all. Rape it. Repeatedly. All two strokes are sluts.

[Ixion]

If you do it correctly it is quite possible to create enough smoke that the neighbours from a couple of houses down might wander up your driveway to make sure your house isn't on fire

..

My neighbours called the fire brigade just because I had Petal running in the driveway, burning out the oil that had settled in the crankcases. Sheesh.

[FROSTY:Me]

I live in the middle of an industrial area (sorta) so at night I have no neighbours.
Thanks Danger I forgot the packing wouldnt get hot
Um ixion--er if it hasn't had the head n barrel off at least once by now id be bloody amazed

[Reckless]

Jeepers never read so much crap in all my life (except dangers comments which are correct).
Now lets get this straight a modern 2 smoker MX engine doesn't have oil rings as such because they need 2 stroke oil in the crank to lube the bottom end. They have compression rings either one or two.

Never heard of a leaking crankcase seal which leaks oil into the combustion area as the crank and cylinder are generally completely separate chambers because of the casing design. The gearbox is driven from outside the combustion chamber via the crank which has the clutch basket hanging off it! The input shaft is on this side and the output shaft(with the drive sprocket on it) is on the other side with the gearbox in between. If the crank seals where leaking enough to let the little bath of oil in the clutch side into the cylinder you'd be loosing so much compression it prob wouldn't go.

When you stuff the rings in a 2 smoker you loose compression only, it generally doesn't blow any more smoke than normal!

Getting back to you Frosty.
Danger is correct you have a jetting problem probably in the idle, needle low end area if its dripping 2 stroke oil out of the can and still running ok. I would take the carb to bits, check the float level, Idle jet and needle against factory settings. Make a decision from there! Also check the plug is not a few ranges to cold. Go back to factory here as well so you know the fuel mix is being burnt ok.
Secondly Danger is also correct. The can is oil soaked and needs repacking. MR motocycles have SilentSport packing at $15 bucks a bag. Its good shit just take it off, take the stinger out make sure all the holes in it are clear and clean then repack it. Burning it out while its on the bike with a gas torch will only fuck it. I would suggest repack it after you have solved the jetting so the new stuff doesn't get in the same state.
Probably an hours work each and a jet or two!! You may even solve it by the correct plug and moving the needle down a clip or so.
My sons KX85 was deliberatly tuned a bit rich with a drip or two out of the can each ride to take the sting out of it. Just don't run it so rich you get bore wash and glaze it up!
Good luck!

[The Stranger:Me]

Used to work for me when I was a teenager. Have things changed that much?

Shit yeah, I'm fatter, lazier and balding. When I hit the piss hard I no longer feel like drinking all the next day and I can only get it up 3 times a night now - without doing a neo.

Still tougher than most of the teenagers these days anyway, so it's not all bad.

[Katman]

Blah, blah, blah........

Fuck, you're a scream. Couldn't see a wind up if it poked you in the fucking eye.

(And yes, crankshaft seals can leak. You don't lose compression through them - air or oil is sucked into the crankcase under vacuum).