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Discussion Starter #1
What is the most common reason for top end oil failure? Eng was full of oil, oil filter looks good, eng went probly 20 miles after oil change before coming to screeching halt! Jake
 

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+1 on the bogus filters out there.



Any squealing or other noises/symptoms before the bike died?







Was the oil bleed screw loosened on the top end with the motor running after the oil change to make sure the oil was getting up there?

If no oil comes out with the motor running & that screw almost removed disaster is imminent




 

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Discussion Starter #6
+1 on the bogus filters out there.



Any squealing or other noises/symptoms before the bike died?





My grand son was riding it and he said it made a bad sweeking sound





Was the oil bleed screw loosened on the top end with the motor running after the oil change to make sure the oil was getting up there?

If no oil comes out with the motor running & that screw almost removed disaster is imminent




I seem to remeber loosening it a little till oil appeared, does it have to really gush out?







 

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The oil won't "gush" out, its more of a steady weep. Basically you are just removing any air from the system so it can't air lock the top end flow. I place a rag around the screw, back it out a few turns and start the engine. Once you have a steady flow, just re-tighten the screw and turn off the engine. Little shot of engine cleaner to clean up any mess and re check the oil level. Your TW is good to go.
 

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Does anyone have any idea what size the bleed screw is? Yesterday I was commuting home and half a country block from my driveway I see smoke blowing out my rear, no pun intended...I looked done and seen that oil was spewing out the top of the cylinder head. I got her home and realized that the oil galley screw/bleed screw backed out and oil leaked everywhere. Lessoned learned torque to specs.....
 

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Does anyone have any idea what size the bleed screw is? Yesterday I was commuting home and half a country block from my driveway I see smoke blowing out my rear, no pun intended...I looked done and seen that oil was spewing out the top of the cylinder head. I got her home and realized that the oil galley screw/bleed screw backed out and oil leaked everywhere. Lessoned learned torque to specs.....


It should be an M6. M6's usually require a 10mm wrench. Don't forget the seal for underneath the bolt head.



***edited for correct sized threads
 

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whats the length and is a tappered bolt?


It's not tapered. It sits flush on the head. For sealing, it requires that seal underneath the head of the bolt.



I don't know the length for sure. I'd say about 15mm. They won't be much more than a 20 cent bolt so you could grab a different lengths. Or use a paper clip with a bent tap at the end of it that will fit in the hole and allow you to gauge the distance to the end of the threads, then go a couple mm shorter than that.
 

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It's not tapered. It sits flush on the head. For sealing, it requires that seal underneath the head of the bolt.



I don't know the length for sure. I'd say about 15mm. They won't be much more than a 20 cent bolt so you could grab a different lengths. Or use a paper clip with a bent tap at the end of it that will fit in the hole and allow you to gauge the distance to the end of the threads, then go a couple mm shorter than that.




Sorry jake for highjacking the thread...left a good opportunity to bring my concerns to the table. And a big thanks to pmtg for the info.
 

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Nice catch. M6's take a 10mm wrench!




Yeah thanks thou, went to the auto parts store and matched up a 1/4" bolt I used to plug the end of the hole to spay off and it was an M6 bolt at 16mm long. Does take a 10mm wrench. got four hex flange M6 bolts of $3. The big orange HD store did not carry any flange in MM. Thanks sorethumb for the clarifier.
 

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Back to Jake, the most common reason is the oil filter. Beyond that it's the bleed screw, debris that got in the oil filter housing, debris in the funnel or around the oil fill point, wrong oil or bad luck. If it wasn't maintained prior then it's always a gamble for what the previous owner did or didn't do.
 

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Back to Jake, the most common reason is the oil filter. Beyond that it's the bleed screw, debris that got in the oil filter housing, debris in the funnel or around the oil fill point, wrong oil or bad luck. If it wasn't maintained prior then it's always a gamble for what the previous owner did or didn't do.


Also make sure the oil filter is in right...4 holes facing inward.
 

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Discussion Starter #18
Thanks guys, this was a used motor so no telling what happened before. Like I said before, oil was full, right filter, pretty sure I bled it, it went prob. 20 miles be fore death, so no telling. Happen to have spare head set up, just wanted to see if there was someing wierd that happens. Jake
 

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Thanks guys, this was a used motor so no telling what happened before. Like I said before, oil was full, right filter, pretty sure I bled it, it went prob. 20 miles be fore death, so no telling. Happen to have spare head set up, just wanted to see if there was someing wierd that happens. Jake
What oil did you and the previous owner use? Modern automotive oils are not suitable for TWs.
 
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