rm125 anitfreeze in crank during rebuild

bquiker · Jun 19, 2004

i just put a new top end on my rm125 , new piston , rings, head and re-nikisil plated cylinder. when i took it apart i was in such a hurry i didn't drain the anti-freeze. i put it back togrther today and i get no spark from the plug at all because when i took it apart alot of coolant went into the crank and now all i get is a soaked plug on the first kick. it's soaked with antifreeze. how can i get rid of this problem. any ideas would be great. i know all you guys out there have done this before so how did you get this problem fixed. thanks a million ,brent

JasonWho · Jun 19, 2004

Kick it a million times? Find an old cardboard box, flip bike upside down on that and run kickstarter through its motion a lot? You may want to search for posts from people who have dumped their bike in a creek or such.

"i know all you guys out there have done this before so how did you get this problem fixed. thanks a million ,brent"

Not me. I have never heard of anyone else doing it.

MikeT · Jun 19, 2004

Just pull the plug with NO FUEL in the tank. Flip it upside down like jason said and use that kick starter. Once the majority of coolant is out, you may be able to get it started but expect it to run bad until the bike gets hot and the rest of the coolant has evaporated out. That is the easy way.

The hard way is to remove the cylinder and blow out the bottom end with compressed air, then re-assemble it.

I'd try the easy way first. ;)

JasonWho · Jun 19, 2004

Good point on the fuel tank! I bet that is a mess doing that on the trail.

bquiker · Jun 19, 2004

thanks for the ideas i'm going to try and turn it upside down. i think i've kicked it a million times already. yesterday was about 94 outside and think i sweat off about 20 pounds. i was also thinking of taking the pipe off and trying a shop vac to suck the antifreeeze out the exhaust ports while kicking it over. sounds like it might work we'll see. thanks alot

elf · Jun 19, 2004

I just went through the same thing. mine was a leaking base gasket. I didn't ride for a week so the coolant slowly trickled into the bottom end. At first my bike wouldn't start, but a new plug and it started. The bike was running ratty so I reved it up real good and water came shooting out of my exaust. I then realized I had a problem, so I shut off the bike. I took it apart and found out I fried the piston. From lack of lubrication I assume. I then tiped the bike over on its side and about a cup of water drained out of the bottom end. Hope I didn't ruin my crank bearings. Anyway make sure you get all the water out before you try to start it. Another method is to lay the bike on its side put it in gear and spin the back tire.This will pump out the water faster than using the kick starter.

reelrazor · Jun 22, 2004

Maybe I am late to this but here's my 2 cents.

Upside down, or on its' side. I have a blowgun I fitted a piece of automotive brake line tubing to. It is about 18" long and it works well to get water etc. out of bottom ends. If you get the bike/engine sideways and at bdc it is really effective. You can put a right angle bend in the tubing and reach in thru the exhaust port and get it pointing into the high side transfer ports. Hit it with the air and you get everything in the crank to come to the top. Use short bursts and be ready for spray out the exhaust. Roll the engine a couple revolutions and do it again.

This will work with the engine upright but not as well.

Don't keep the bike upside down for too long if you go that route, tends to cause more issues than it is worth.

JasonWho · Jun 22, 2004

Will transmission oil run out the vent tube if you turn it upside down??

ScottS · Jun 22, 2004

be careful not to let the cylinder hydraulic lock- you can bend the connecting rod- i would also be concerned that the coolant has rusted things down there- sounds like blowing out is the best solution

reelrazor · Jun 23, 2004

Jason, yes, on some bikes the trans will drain while upside down. Some will get air in the fork and shock oil too, but that isn't a concern if the bike is inverted for a short time only.

I forgot to say that getting some raw two stroke oil in the bottom end right away is a good thing too(same thing, you can feed it directly there by going up the exhaust port or plug hole at bdc and dripping oil down one of the transfer ports-crazy straws work well down the plug hole).

Then plug out and a bunch of kicks or push it in gear just to make sure the bearings are all coated well and any coolant mix left is very dilute.

If bq does this and still sees coolant then something else is wrong, he has a coolant leak somewhere(base gasket is rare-not many have coolant passages, more likely a head gasket issue).

Ohh yeah, when it does fire, do all you can to make sure it stays running until hot. It will prolly miss a bit and smoke some, and you may need to remove the plug and dry it if it dies, but do that until it is hot hot. Then a new plug and go ride.

RM 2 fif T · Jul 22, 2004

I just did a top end on my bike also and i thought i drained all the anti freeze out but apparently i didn't and some got into my bottom end I'm guess the same thing is happening to me also because my spark is a lot weaker and i can get my bike to fire up for about 2 seconds then it shuts off. If you get the anti freeze out, let me know which way you did it and if it worked. :bang:

rm125 anitfreeze in crank during rebuild

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