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adamchatum
Guest
Can anyone tell me what this hole is for? I've got oil leaking out of it, and I need to fix it. Its located under the starter, in front of the drive sprocket.
Thanks
Thanks
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B
bietau85
Guest
What bilke is it? I could look it up. put ur bike in your signature under user CP. Its the top far left tab.
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adamchatum
Guest
Its a 1979 GS750L
Ah, the Mystery Hole:
Comes out here -- the blue hose is just stuck in there to show they're connected:
From the top:
There's a space in the casting in that area. The upper mystery hole serves as a drain for the starter cavity. The starter cavity is not sealed, so you need to make sure both mystery holes are open so that water can drain out if you ride in the rain.
If oil is coming out, it normally means that the o-ring on the nose of the starter is old and decrepit.
Of course, other oil leaks in this area can make their way into the starter cavity and out the mystery hole. For example, the cam chain tensioner or valve cover. Or if you have a fuel leak, it can end up washing through oil and dirt.
Comes out here -- the blue hose is just stuck in there to show they're connected:
From the top:
There's a space in the casting in that area. The upper mystery hole serves as a drain for the starter cavity. The starter cavity is not sealed, so you need to make sure both mystery holes are open so that water can drain out if you ride in the rain.
If oil is coming out, it normally means that the o-ring on the nose of the starter is old and decrepit.
Of course, other oil leaks in this area can make their way into the starter cavity and out the mystery hole. For example, the cam chain tensioner or valve cover. Or if you have a fuel leak, it can end up washing through oil and dirt.
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adamchatum
Guest
Very nice reply I must say... Pictures and all. I hope you didn't disassemble your whole engine just to take those pictures for me.
I'll take my starter out tomorrow and see if its seeping out of that o-ring your talking about.
Thanks again.
I'll take my starter out tomorrow and see if its seeping out of that o-ring your talking about.
Thanks again.
F
Flaming Chainsaws
Guest
Now that would be AWESOME!
Brian has posted those photos at least half a dozen times before. Nobody searches so smart men like him keep the photos handy.
J
JEEPRUSTY
Guest
Ok the mystery hole is solve but I have an odd depression in my belly.
Where does that go?:dancing:
I love these smileys. I had no idea they were so cool.
Where does that go?:dancing:
I love these smileys. I had no idea they were so cool.
Yep, I've got several like this related to oft-repeated topics. That's a defunct GS850 engine in the photos, but the Mystery Hole is common to most, if not all, GS models.
What I think is awesome about this thread is that the OP actually called it a "Mystery Hole".
I thought I coined the term, but maybe it's obvious...We usually get two or three Mystery Hole threads a year, and a few times people have actually gone to the trouble of plugging their Mystery Hole with epoxy before asking about it, which leaves the starter swimming in water/oil the first time you ride in the rain.
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adamchatum
Guest
Thanks for all the help guys! I would have done a search, but I didn't know what the heck to search for! 
Makes sense now to have a place or the water to drain.
Makes sense now to have a place or the water to drain.
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adamchatum
Guest
Well, I ended up taking out the starter, and there seems to be no oil coming from the starter shaft. I guess the only possible leak could be from the upper and lower crank case split line??? Great!
Crankcase leaks are very rare. Best to take a real close look, most likely it's something more obvious.
So you have an "inny" and not an "outy"
S
Souske
Guest
Outties are wierd , like gingers. I suspect they also make the parents love the child less.
I think a lot of us have given us searching because it often fails and in many instances we can't think of what to search for. In this instance what are the 2 search words (3 words always returns an error) that would return this thread. Do you see what I mean?
Greetings
Greetings
Agemax
Forum Guru
"mystery" and "hole" :-\\\
H
Havoc1231
Guest
Being someone who just recently split, cleaned and reassembled his crank cases, If I did apply too little liquid gasket (I used yamabond) and the crank case leaks, is there a quick fix like applying liquid gasket to the outside of the crankcase? I haven't completed the rebuild yet, but am preparing for the worst.