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Discussion Starter #1
Yesterday I decided to change the oil on my bike since the clutch had kind of a chatter to it. The oil in the bike looked fairly new, but who knows what the previous owner had in there. I used an OEM Yamaha oil filter (the one in there was the same, so that's good.)



But when I tried the pull the drain plug it was stuck, as if someone had installed it with an impact wrench! I put a six point 19mm socket on it and kept it square, but the plug went from looking like new to this:









I probably applied over 100 ft/lb of torque to get it to come loose. I sprayed CRC freeze off on it, smacked the socket with a hammer first, etc... Because I didn't want to round the ends off. But it just would not come loose. Finally it did come loose though and I got it out.



I didn't install it very tightly because I want it to come off again.



Is this common? Does the o-ring freeze to the case or what? I have dealt with similarly shaped Honda valve tappet covers getting dry welded to the heads of those bikes.



Is there any good way to prevent this from happening or did the previous owner just happen to be an angry gorilla?
 

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Discussion Starter #4
I don't think my plug was seized at the threads. I think the 'hat' part was stuck to the engine case by the rubber o-ring. I put grease on the rubber ring.. I was just curious if it's common for them to tighten up between oil changes.
 

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I don't think my plug was seized at the threads. I think the 'hat' part was stuck to the engine case by the rubber o-ring. I put grease on the rubber ring.. I was just curious if it's common for them to tighten up between oil changes.


Only if your oil changes are 5 years apart!




I lowered the torque value to 28 from 31 ft/lbs and haven't had any difficulty since. Probably ought to slap a new O-ring in there every five years.



And clean the flange and O-ring, even a tiny bit of very fine grit will cause problems at the next change.
 

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Discussion Starter #6
What's weird is that before I tried to remove it, it wasn't distorted as if someone had over-tightened it.



Good to know that it's not a common issue! Hopefully it'll come out easier the next time I need to get in there.
 
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