Question about Suzuki RM 125 Motorcycles

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Suzuki RM 125 water is mixing with the gearbox oil how do I fix it, or what is the cause. The water is leaking from the cooling system and turning the oil milky. I have just changed the oil and filled up the water in the radiator after having a re bore and new piston done. After a couple of minutes running the bike the oil had gone milky and the water in the radiator depleted. Any ideas what the problem may be and how to fix it please. I am a little stumped.

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The water pump is in the motor case and has a leaking seal. Anti freeze is leaking past the water pump seal into the transmission. Take your water pump apart and replace the seals. The fluid should be escaping out a weep hole in the bottom of the pump, so when you have it apart be sure and dig the mud out of the weep hole to keep from filling the motor with anti freeze if this ever happens again. If there is no weep hole then it must not have been designed with one.

Posted on Jul 31, 2010

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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

3 Answers

Suzuki RM 125 water is mixing with the gearbox oil how do I fix it, or what is the cause. The water is leaking from the cooling system and turning the oil milky. I have just changed the oil and filled up...


Did you do the reassembly yourself? If not, take it back to whoever did because the reassembly was done incorrectly. Oil and water mixing can only happen at the top or bottom ends of the barrel. Either the head gasket is not seated properly or the barrel to casing seals are not properly installed

Jul 31, 2010 | 2003 Suzuki RM 125

1 Answer

Just got a suzuki rm 125 2004 wat is the premix for it i used 2 run a cr125 on 100ml of oil to every 5liters of petrol


yes that is correct. 100ml to 5 liters of petrol, will give you a 50:1 mix Same will work for your rm 2 stroke.
I would recomend a synthetic 2 stroke oil for a 50:1 mix.

Jun 17, 2010 | 2004 Suzuki RM 125

1 Answer

How do you change water pump seal 98 rm 125 !!???


It should be just that, a leaking seal, gasket. The water pump is external on that bike and doesn't go anywhere but the cooling dept.It doesn't get mixed with oil or anything. Take off the pump itself and replace the gasket. I think that should do it, unless it is the pump itself leaking.
Suzuki RM125 RM 125 Water Pump Housing,,,,
That is an ebay ad. Just in case. Hope this helps.

May 03, 2010 | 2003 Suzuki RM 125

1 Answer

I have a 1998 suzuki rm 125 how do i mix the fuel and oil: example 10l fuel how much oil must i add?


What is the recommended fuel fix ratio by the bike maker? if it is 50 to 1= 10000ml / 50 = 200 200 x 1 ml = 200ml of oil to 10 litres of fuel.
200ml to 10 litres of fuel

Apr 26, 2010 | 2005 Suzuki RM-Z 450

1 Answer

I have white oil dripping out of my 2001 rm250.. what do i do?


hi,you arent going to like this ,but it is water from the cooling system getting into your transmission,rm bikes are famous for it,you will probably find that there is a seal on the back of the water pump (which is driven off the crank)has failed letting the water in to the gearbox,drain the gearbox,flush it before running it again,but get the faulty seal fixed first...hope this helps...cheers

Mar 30, 2010 | 2003 Suzuki RM 250

1 Answer

What kind of oil does my 2003 rm 125 need


For the gas tank= 2-stroke motor oil mixed at 32:1 *stock mixing ratio* [that's 32-parts gas to 1-part oil]. **[I personally use a 40:1 mixture for trail riding,..and 50:1 mixture for racing at the local MX track].

Mar 16, 2010 | 2003 Suzuki RM 125

1 Answer

Is there a difference in what oil you put in the crankcase vs the fuel mixture?


Yes, and the two are completely unrelated. In the crankcase, which on your bike is actually just the gearbox, you can use any high quality motor oil (same as what is used in the crankcase of a four cycle engine). As for the oil that you pre-mix with the fuel, again use any high quality two cycle engine oil and mix according to the oil manufacturer's recommendation.

Jan 03, 2010 | 2003 Suzuki RM 125

3 Answers

Oil is a grey colour in the engine of my yz 125 2001


Your bike is water cooled. Some of that water is leaking into the gear box. The cylinder gasket is the likely leak. I would let the shop take a look at it instead of trying to fix it yourself.

But be sure there is not an external source for the water. Do you wash the bike often? Ride the creek bed often? Leave the bike where the lawn sprinkler gets the bike wet? Leave it out in the rain? Change the oil and keep the bike dry. If the problem comes back then go see the dealer.

Mar 19, 2009 | 2003 Yamaha YZ 125

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