Crankcase condensate drain ?

[MaryK]

My DH is doing a 3k mile check-up on my GV250.
He is looking for the drain hose/plug for draining the condensate from the crankcase.
He just checked the air filter box and could not find a drain there.
The service manual does not indicate a hose/plug nor any mentioning of draing the condensate.

Anyone with an answer?

Scoot safely,

[windwheeler]

I have not heard of this and do not see a need with an oil change, as all fluids should drain out.  If it is not in the workshop manual (you can find PDF online) then it is not an issue either in the eyes of Kymco.

[Vivo]

I use pressurized air after draining the oil... 

[MotoRandy123]

Here's a picture from the service manual. There's a tube from the head to a oil separator chamber
on the intake tube. There's probably an open tube draining it...

[MaryK]

Thanks Randy,

We did notice a plugged hose on the left side of the air box, near the bottom, but we had not seen your drawing.


Thanks,
scoot safely,

[windwheeler]

Can you/your mechanic explain why you even think there should be condensation water in the crank case?   Never heard of needing to do that, and the Kymco G/V Workshop manual makes absolutely no mention of that. 

So, where does this thought have its roots from?

[MaryK]

Every motorcycle that my husband has owned has had a drain on the airbox to drain out oil/gas/water that
is pulled over from the crankcase.  I can't see why a scooter engine would be any different.  In cold weather
the amount is much greater than in warmer weather due to the colder temperatures condensing water vapor from the air inside the crankcase.  Some engines have greater oil and/or gasoline vapors than others. 
Water-cooled engines have less than air-cooled ones due to the tighter tolerances of those engine.

Other scooter owners have mentioned the puke tube/plug on their scooters but no-one on the GV250 forum.

Thanks for your ideas

scoot safely,

[windwheeler]

There are two different subjects you are touching:

• The air filter box
• The crank case

As I agree with you on the air filter box that water can enter through rain.  I disagree with you on the crank case condensation.  There is NO issue with any crank case condensation on motorcycles.  The temperatures will literally boil off any condensation water if there was some and the bike is used.

The only time this could  in a "very theoretical" way happen is if the bike has been sitting for a long time, not used, and in extreme changing temperatures outside, hot and cold, and wet.  Or, if there is a damage on a hose, or the casing is cracked, and water enters the crank case, but not the way the engine was designed.

Regarding crank case condensation, you are looking for something fictive and that is not a problem on Kymco 250 engines.

[MaryK]

This is an interesting article:  http://www.motorcyclecruiser.com/tech/blowby_motorcycle_engines/
involving engine blowby.

Also articles on scooter engines:
http://www.scooterforumonline.com/index.php?topic=1851.0

http://scootdawg.proboards.com/thread/51628?page=1

Anyway, DH opened the airbox and saw no accumulation of liquids. 
The air filter did have some oil and trash on it, but looked like it was good for another 3k miles. 
The rain/high humidity arrived before he could chase down the plugged hose from the left side of the airbox.

Have a good weekend and scoot safely,

[MotoRandy123]

Well condensation in this case is large oil droplets that are separated out of the
PVC circuit. It should be checked and drained as needed...

[MaryK]

My DH found the drain on the airbox.  At the front side of the airbox on the lower hose.
There is a short (6") hose with a 1/4" drain plug that sort of dangles from the front of the airbox  along with an 1/8" hose.
Just move the wire clip up and pull the plug out.  Only water came out and it was not a lot.  Impressive for 3k miles.

Too bad we could not find it in the owners manual nor the Service manual .

Scoot safely,

[de-dee]

    ther is a drain plug on the 300i downtown also,.  I did not find it till I was at 22,000  km.,  there was about 1 teaspoon in it ,.  now I check at every oiol change,  and there is only a few drops,. 

[windwheeler]

So, is it really a "crankcase condensate drain", or, rather an "air intake water separation drain?"

[MaryK]

I don't know which you want to call it.... Just happy to find it and even happier that it hasn't been needed for 3k miles.

Since it is connected to the top of the crankcase and the rear gearbox as well as being part of the airbox, it should provide several functions associated with condensation vapors, so lets leave off the specific and
just call it the condensate drain.

Scoot safely,