(05-02-2018, 04:30 AM)Inhouse Bob_imp Wrote: [ -> ]But it would do no harm. I have found it much easier to get the new oil in if I remove the cap. YRMV.
HAHA... yeah that helps when putting the oil back IN for sure. But remember that the new oil will flow through the motor faster if you leave the drain plug out as well.
It's funny that this should come up, but Saturday I was up at the shop and asked the head mechanic (30 something years factory trained Honda and Yamaha & the guy that does all my work), his opinion of doing oil changes hot or cold (since I had just changed the oil in my ST Friday and warmed it up with a 40 mile test ride first). He says at the shop, he drains them hot, because it drains quicker, and he is on the clock. At home and on his own bikes (a 2010 Goldwing and a Yamaha XT 500 enduro) he drains them cold, because every bit of the oil and contaminants are in the pan at the bottom of the crankcase. He says it takes longer to drain, but at home he pulls the plug and goes and has lunch and when he gets back, it's drained. He felt he got out more contaminants that way.
Pity that the oil flows out of the engine a lot faster than it goes in. Why did Honda make such a tiny hole for the filler plug?
General rule/theory;
As the oil pan is mostly flat at its bottom, oil, dirt, metal filing drain out better and faster due to thin oil.
If cold/thick oil, some of above particles may stay trapped with oil on flat (no flow) oil pan surface.
The best: drain it hot, leave it for some time or overnight, then install back drain plug/washer.
You will drain a bit more oil when hot, not cold.
pb
Remember, we're talking about a bike that leaves at least a quart in there, no matter how many tiny drops you let fall out of the pan, hot or cold, long or short.
IT DOESN'T MATTER.
Now, having said that.....I'm the guy who, during my last oil change, was bored enough to actually unbolt the oil cooler and associated lines, and drain them too.
I'm still not sure what possessed me to do that, but like I said, it was a rainy day and I was seriously bored.
Conclusion? It was a big mess, I'm an idiot, and the extra few ounces of oil I got out was just absolutely not necessary.
Plus, the risk of stripping one of the bolts going into the block wasn't just unnecessary, but downright foolish.
(05-02-2018, 11:21 AM)Jim21680_imp Wrote: [ -> ]Remember, we're talking about a bike that leaves at least a quart in there, no matter how many tiny drops you let fall out of the pan, hot or cold, long or short.
IT DOESN'T MATTER.
Now, having said that.....I'm the guy who, during my last oil change, was bored enough to actually unbolt the oil cooler and associated lines, and drain them too.
I'm still not sure what possessed me to do that, but like I said, it was a rainy day and I was seriously bored.
Conclusion? It was a big mess, I'm an idiot, and the extra few ounces of oil I got out was just absolutely not necessary.
Plus, the risk of stripping one of the bolts going into the block wasn't just unnecessary, but downright foolish.
U did it = you learnt a hard lesson = is the best way to remember own "mistakes"...from now on u can only be better
Good luck next time
pb
Jim, Just how much oil was left in the oil cooler? Rough guess is good.
Maybe 10-15 ounces? The oil cooler itself is easy to remove and drain, even if it does make a bit of a mess. It's the lines that I shouldn't have touched.
Thanks Jim. I’ve been wondering for some time.
I used to get together couple times a year with KLR650 owners for "tech days". Regarding oil changes, a guy suggested, that once "all" the oil had drained, leaning the bike over to one side for 15-20 seconds, then the other way for another 15 seconds...sure enough, another stream of oil would begin to flow somtimes lasting more than 10 seconds. I can do this on my KLR about 5 or 6 times, each time more oil comes out. I tried the same on the CB1100 this evening and sure enough, after leaning the bike this and that way, a bunch more oil drained (had to put plug back in and move oil pan to the side so it wasn't in the way as I took bike off center stand to lean left/right). Tried it again, and not nearly as much as the first time, but some. That was good enough as the CB is heavier than the KLR650 by about 130lbs.