what is this hole for?????

crazymater91 · May 21st, 2011, 10:18 PM

Its on the left side as your sitting on the bike I seam to have a bit of oil coming out of it

Snake · May 22nd, 2011, 08:02 AM

I could not find it in the Service Manual but it looks like it could be a freeze plug which seems odd that oil would be coming out. Check the radiator to see if oil is getting into the cooling fluid.

greg737 · May 22nd, 2011, 08:13 AM

Just at a glance I think it's one of two drain holes (one on either side of the head) for the spark plugs. Remember that the spark plug holes are very deep in the engine's head.

FrugalNinja250 · May 23rd, 2011, 07:25 AM

It's the spark plug recess drain. There's only one, on that (the down-hill side when parked on the side stand) side of the motor, there's a hole connecting the two plug recesses together. If you've got oil leaking from there it means one of your valve cover gaskets is out of place or damaged.

Snake · May 23rd, 2011, 02:47 PM

Thanks Frugal, I did not know that. I guessed wrong.

crazymater91 · May 25th, 2011, 10:35 PM

Thanks guys makes sense it got a little worse after I did a valve job

Archerzz · May 30th, 2011, 12:22 PM

Sorry to hijak this thread a bit, but since it has been resolved it seems like a good time to ask a related question. When I was washing my bike today I noticed that there was basically dirt crammed in that hole I cleaned it out and it looks clear, so should everything be fine or is this an issue?

headshrink · May 30th, 2011, 12:33 PM

I have a new-gen, which doesn't have this hole, but I assume you are better now that it is clear, than you were when it was clogged with dirt. You basically unclogged the drain.... that's a good thing.

Archerzz · May 30th, 2011, 12:58 PM

Quote:

Originally Posted by headshrink

I have a new-gen, which doesn't have this hole, but I assume you are better now that it is clear, than you were when it was clogged with dirt. You basically unclogged the drain.... that's a good thing.

Yea thats what I figured just bought the bike used a few weeks ago and noticed today that I have accumulated a whole lot of bugs on the front facing parts of my bike =P during the waxing I noticed that the hole was just brown like mud had gotten in so I sprayed and scraped it out, came out relatively easy.

greg737 · May 30th, 2011, 06:28 PM

Every so often you'll see a post here on this forum (and the other ninja 250 site) where somebody has a bike that dies every time he rides in the rain. Sometimes the cause is water pooling in the spark plug recess, messing up the ignition system. That drain hole definitely serves a purpose.

johnjohn · May 31st, 2011, 03:44 PM

Probably plugged by a mud wasp.

May 30th, 2011, 12:33 PM	#8
headshrink ninjette.org certified postwhore Name: Bob Location: CA Join Date: Dec 2008 Motorcycle(s): '08 Ninja 250r, '14 CBR500r Posts: A lot.	I have a new-gen, which doesn't have this hole, but I assume you are better now that it is clear, than you were when it was clogged with dirt. You basically unclogged the drain.... that's a good thing. __________________________________________________ Honda Interceptor VFR800 DLX (2014, 8th gen) Honda CBR500r (2014) - FOR SALE Kawi Ninja 250r (2008) - Restored and passed-down within family, only to be abandoned

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May 22nd, 2011, 08:02 AM	#2
Snake ninjette.org certified postwhore Name: Rick Location: Alexandria, Louisiana Join Date: Jan 2009 Motorcycle(s): 05 Blue Ninja 250 Posts: Too much. MOTY - 2017, MOTM - Jan '19, Oct '16, May '14	I could not find it in the Service Manual but it looks like it could be a freeze plug which seems odd that oil would be coming out. Check the radiator to see if oil is getting into the cooling fluid.

May 22nd, 2011, 08:13 AM	#3
greg737 - Name: - Location: - Join Date: May 2009 Motorcycle(s): - Posts: A lot.	Just at a glance I think it's one of two drain holes (one on either side of the head) for the spark plugs. Remember that the spark plug holes are very deep in the engine's head.

May 23rd, 2011, 07:25 AM	#4
FrugalNinja250 ninjette.org certified postwhore Name: Frugal Location: Dallas/Fort Worth (DFW) Join Date: Mar 2010 Motorcycle(s): Several Posts: A lot.	It's the spark plug recess drain. There's only one, on that (the down-hill side when parked on the side stand) side of the motor, there's a hole connecting the two plug recesses together. If you've got oil leaking from there it means one of your valve cover gaskets is out of place or damaged.

May 23rd, 2011, 02:47 PM	#5
Snake ninjette.org certified postwhore Name: Rick Location: Alexandria, Louisiana Join Date: Jan 2009 Motorcycle(s): 05 Blue Ninja 250 Posts: Too much. MOTY - 2017, MOTM - Jan '19, Oct '16, May '14	Thanks Frugal, I did not know that. I guessed wrong.

May 25th, 2011, 10:35 PM	#6
crazymater91 ninjette.org member Name: Marcus Location: brooksville Join Date: Apr 2011 Motorcycle(s): 1994 kawasaki ninja 250 Posts: 54	Thanks guys makes sense it got a little worse after I did a valve job

May 30th, 2011, 12:22 PM	#7
Archerzz ninjette.org member Name: Jordan Location: Greencastle, Pa Join Date: May 2011 Motorcycle(s): 2007 Ninja 250r Posts: 79	Sorry to hijak this thread a bit, but since it has been resolved it seems like a good time to ask a related question. When I was washing my bike today I noticed that there was basically dirt crammed in that hole I cleaned it out and it looks clear, so should everything be fine or is this an issue?

May 30th, 2011, 06:28 PM	#10
greg737 - Name: - Location: - Join Date: May 2009 Motorcycle(s): - Posts: A lot.	Every so often you'll see a post here on this forum (and the other ninja 250 site) where somebody has a bike that dies every time he rides in the rain. Sometimes the cause is water pooling in the spark plug recess, messing up the ignition system. That drain hole definitely serves a purpose.

May 31st, 2011, 03:44 PM	#11
johnjohn ninjette.org member Name: John Location: Caledonia, Ontario, Canada Join Date: Jul 2010 Motorcycle(s): Honda, Buell, Kawasaki, Suzuki, Yamaha Posts: 170	Probably plugged by a mud wasp.