Question about 2005 KTM EXC 125

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1986 rm 250 water in oil

(1986 rm 250) how do I troubleshoot water in oil? Is it the head gasket or wather pump gasket, bike still has lots of power.

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  • DaveBShaw May 11, 2010

    Is it water in the oil or antifreeze ?



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  • KTM Master
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Its the head gasket ,you will have to replace it.

Posted on Jul 21, 2009


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I have an 86 rm 250,replaced water and oil seals twice still getting water in oil. What gives?

The problem is common in 2 stroke watercooled bikes ,what happens is the head gasket leaks and the leaking burnt gases pass the gasket and sneak into the water jacket which highly compresses the cooling system and blows the water past the water pump seals and into the gearbox,mixing with the oil and making a vile mayonnaise mixture,make sure when you fitted the seals you fitted them the right way around the main sealing lips should both face their fluid they are keeping out and the impeller shaft should be free from and scoring or damage where the seals touch it.p.s im a fully qualified motorcycle mechanic with over 20 years experience so im not just guessing at an answer

Feb 15, 2015 | 2004 Suzuki RM-Z 250

1 Answer

My 2001 yz250 is leaking alot og gear oil when idoling out of a hose coming out the bottom of the bike then wen i shut it off it starts leaking coolent out of another line coming out the bottom of the bike...

The leaking coolant is a sure fire sign that you likely have a blown head gasket or your water pump is not pumping water any longer and the bike is overheating.

The leaking oil could be coming from your power valve vent - is it pitch black oil and is it coming from the front of the engine?

What color is the oil? Are you sure its gear oil? Is the gear oil milky and foamy? Is the gear oil level high or low? Is there water in the oil?

Sorry for all the questions - there are several things that could be happening here.

Oct 15, 2011 | 2003 Yamaha YZ 250

1 Answer

2004 rmz 250 was riding started to smoke heavily from exhaust bike stalled no coolant in rss but nothing leaking ?

If it was white smoke coming out you may have blown a head gasket. If it is water cooled and there are no signs of external leakage then it only has one other way to go, inside.
If you have an oil dipstick, pull it out and check to see if your oil looks more like a milk shake sludge. Even if you can't see it, try dumping your oil from the sump and take out your oil filter. (unless it is a 2 stroke)

Sep 17, 2011 | 2004 Suzuki RM-Z 250

1 Answer

I have a 2006 Suzuki RM-Z 250. I just recieved it from my brother and its not running. I went to check the spark and when i kicked it over water shot out of the spark plug hole. I drained the oil and the...

Definitely the head gasket mate water cant really get above piston any other way - the piston would be sucking water into it on the down stroke then on the up stroke water would be passing pass the piston rings into sump oil
the only test you can do with out the bike started is a compressed air leak down test I happy to elaborate on this test if you need but if you do all your own rebuilds then I sure you know all about it..
when you take head off to replace gasket I would highly recommend you get the face of the head machined as pretty much any head that age in my experience at least would have some warpage to the face which will become harder and harder to get good head gasket seal even with new gaskets also if budget allows this would be great time to consider new piston and rings kit even new cylinder as its all apart any how if you can afford it would be very worth while
when you get running again I would also change that oil completely and oil filter every ride for at least 2 or 3 times to make sure all that water is all gone - or it will bite you later with far worse problems than head gasket issues

Jun 03, 2011 | 2005 Suzuki RM-Z 250

1 Answer

I have a 1998 rmx 250 and have water in the gear box oil is it just a seal cause theres no visable cracks anywhere....i have ordered a new seal and sharft

If this is the four stroke version, the most likely cause for water in the oil would be a blown cylinder head gasket. Unfortunately the only repair in that case is a head skim and gasket replacement.

Feb 21, 2011 | 2003 Suzuki RM 250

1 Answer

Check compression seems to be ok,engine does not smoke when cranked and running,is there another known source for water to enter the engine besides head gasket,by checking compression head gaskets seem not...

I've got 169,000 miles on my 1977 Goldwing and I can tell you, for sure, that you have a bad water pump. When the water pump seal and bearings go bad, it allows liquid from the cooling system to dump right into the crankcase. Mine does this about every 30,000 miles, like clockwork.
What you are going to need is a new water pump and the associated gaskets and o-rings. This is all on the front of the engine, so you will be changing the oil and filter, at the same time.
This is a very time consuming and tedious task, so be ready. But hey, it's still a lot easier than changing the head gaskets!

Nov 07, 2009 | 1986 Honda GL 1200 Aspencade Gold Wing

2 Answers

01 rm 125 transmission oil milky

sounds like the head is warped or the gasket is letting water into the cylinders
needs fixing asasp!

Aug 11, 2009 | Suzuki RM 125 Motorcycles

1 Answer

Overheathing ,1986 vw diesel.

sounds like your head gasket could be blown as you have checked everyting else

Feb 12, 2009 | 1986 Volkswagen Golf

1 Answer

Suzuki 250 2001 model

try tightening up you head bolts to and check the head gasket if you ripped it a little bit then it will let water pass through too..

Dec 05, 2008 | 2005 Suzuki RM 250

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