07 YZ450 tiny hole on right side of engine, coolant leak

jpf566
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jpf566
Edited Date/Time 5/15/2013 2:01pm
Hey Guys, Whats this hole on the side of the engine, looks like a weep hole of some sort? http://imgur.com/3thLRRk As you can see its a new head and something had previously leaked out of it... I just bought the bike and am paranoid somethings wrong... Thanks
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jsmx97
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jsmx97 5/9/2013 6:22am
5/9/2013 6:22am
Thats a weep hold for the spark plug cavity. It looks like mud got past the spark plug cap and came through the weep hole.
xnationalwrench 5/9/2013 11:28am
5/9/2013 11:28am
The parts list shows a 6mm X 10mm bolt on that side of the cylinder go to your dealer and see if yours is missing.
Paw Paw 271
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Paw Paw 271 5/9/2013 2:34pm
5/9/2013 2:34pm
It's the spark plug weep hole as stated above.
xnationalwrench 5/9/2013 2:45pm
5/9/2013 2:45pm
Paw Paw 271 wrote:
It's the spark plug weep hole as stated above.
Not trying to be wise guy but the picture shows the hole below the nuts that the cylinder mount on and the spark plug is in head..

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motofab36
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motofab36 5/10/2013 5:19am
5/10/2013 5:19am
xnationalwrench wrote:
Not trying to be wise guy but the picture shows the hole below the nuts that the cylinder mount on and the spark plug is in...
Not trying to be wise guy but the picture shows the hole below the nuts that the cylinder mount on and the spark plug is in head..
click on the link to the pic he posted, its definately the spark plug weep hole he's talking about
jsmx97
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jsmx97 5/10/2013 2:15pm
5/10/2013 2:15pm
Paw Paw 271 wrote:
It's the spark plug weep hole as stated above.
xnationalwrench wrote:
Not trying to be wise guy but the picture shows the hole below the nuts that the cylinder mount on and the spark plug is in...
Not trying to be wise guy but the picture shows the hole below the nuts that the cylinder mount on and the spark plug is in head..
That bolt does exist, but it's not for the hole he is showing in the picture.
toolie
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toolie 5/14/2013 5:14pm
5/14/2013 5:14pm
its the case breather hole for the NoS button on the handle bars that leads to the flux capacitor...duh xnationalwrench

seriously though clearly he needs to change the muffler bearing seals.

and maybe after washing his bike he can grab the air compressor and blow out the spark plug hole....so the water wont rust the plug and leak out of the weep hole like a 16 year old popping zits in the mirror
motoxer66 5/14/2013 5:26pm
5/14/2013 5:26pm
seriously i thought the park plug was in the bottom end by the tranny not the head i mean that where the NoS plugs in right..........

this one time at band camp...i saw a picture of a leaky cyl head.......you know what they did with that leaky head.....they used compressed air to blow out the water from washing the bike.....and you know what happened....no more leaky head....amazing....


thanks for the bolt tip though xnationalwrench seriously i did that on my 2006 rmz/kxf 450dfjhf and it totally solved the problem at the weep hole....but now my spark plug cap keeps blowing off like a teenage boy who found his first hustler

is there a bolt to hold the plug cap down too....maybe a 6mm x 20mm that was cut with a hacksaw to be a 6mm x 10mm

ps love you xnationalwrench Woohoo Blush Dizzy Evil
mx5471
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mx5471 5/15/2013 2:01pm
5/15/2013 2:01pm
xnationalwrench. I think you're looking in the wrong place. The picture clearly shows that it's the spark plug weep hole. I'm thinking you're looking at the bolt for the oil passage to the head. When you change the oil, and start the bike, you're supposed to loosen that bolt and make sure oil drips out of it so you know it's flowing to the head.

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