Engine Smells After Oil Change - Page 3 - Honda Rebel Forum
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post #21 of 29 Old 10-11-2018, 12:38 AM
 
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Why would there be an odor? Is your breather line open? I don't think changing the oil will change anything. That oil should be fine.

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post #22 of 29 Old 10-11-2018, 07:05 AM
 
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@Duckster yes you caught me trying to oversimplify it. API tests 6 properties, each S* level has 3 or more criteria that are higher than the lower one, and the tags of "energy conserving", "resource conserving", "SN Plus" represent categories of improvement for only 1 or 2 of the 6.


My point attempted to say that our owner's manuals were authored back in the day when SG oil was at the top of the chart (and not much effort went into the updates after that) and with modern Automotive Engines driving the new Automotive Categories you can't use the API S* spec for picking your motorcycle wet clutch oil anymore.



You have to look for the JASO MA/MA2 tag.
JASO Explained Part 1: 4-Stroke | MotoTribology





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Originally Posted by Shadow Shack View Post
The API donut is blank on the bottom, the smell is still present but not as prominent. As of this post, no drips under the bike after a ride earlier today. I'm still leaning toward changing it to MC oil to see if the odor goes away.
@Shadow if you are smelling the oil cooking off the hot exterior of the motor or exhaust its not an issue with the grade of oil. Hopefully its just spilled oil (and not a coincidental leak starting) somewhere you didn't see/notice and a good cleaning or riding time will get rid of it.

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post #23 of 29 Old 10-11-2018, 12:10 PM
 
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The JASO MA rated oils are specifically designed for motorcycles with wet clutches, so in that sense they are the logical choice for a motorcycle. The problem is that its a boutique market compared to automotive oils so the price is high. I also agree that you do need to be more aware of what you're getting because of the proliferation of friction modifiers in automotive oils. For a Rebel, oil changes need to be frequent but the oil capacity is small so the cost issue is not really that significant for most of us in the big picture. Certainly the only good argument against using them would be the cost.

From the brief research I've done, I'm still comfortable using 20W-50 GTX oil in my Rebel or British bike primary chaincase (they have 75W-90 gear oil in the separate transmissions) since this grade of oil still does not contain any unusual friction modifiers or meet any of the modern low friction specs for fuel economy in cars. IMO nothing has really changed since the advent of "energy conserving" oils at least 20 years ago. The extreme friction modifiers have never been added to the heavier viscosity grades, and the lighter grades that do have them (which I would not use in an aircooled engine anyway) are clearly marked as such.
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post #24 of 29 Old 10-11-2018, 01:32 PM Thread Starter
 
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Quote:
Originally Posted by Duckster View Post
Why would there be an odor? Is your breather line open?
Therein lies the issue. The breather line is connected at both ends. There are no leaks. There is no visible smoke. The dipstick level is the same as it was after the change. The odor started immediately after the oil change and while it has diminished it is still present.

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post #25 of 29 Old 10-11-2018, 02:04 PM
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So no leaks, no smoke, no spills - then the smell must be coming from the air filter housing. Something in the new oil distilled out during the first runnings?

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post #26 of 29 Old 10-11-2018, 02:41 PM
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Quote:
Originally Posted by Duckster View Post
The JASO MA rated oils are specifically designed for motorcycles with wet clutches, so in that sense they are the logical choice for a motorcycle. The problem is that its a boutique market compared to automotive oils so the price is high.
Shell Rotella 15W-40 is JASO rated, and not nearly as expensive as motorcycle specific oils. I've heard it's costly to go through the process of getting a JASO rating, and that may be why manufacturers of oils that would be fine in wet clutches just don't bother getting the rating. As you say, there is a limited amount of oil purchased for motorcycles and some manufacturers just don't think a JASO rating is worth it.

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post #27 of 29 Old 10-12-2018, 07:33 AM
 
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Did the inside-the-air-box breather line come off the air filter?
Did you lube your chain and accidentally get some on the exhaust pipe?
If it were burning oil in the pistons you would have a different smell from the exhaust than the smell of hot oil cooking off the block or exhaust. Keep looking, its probably in a tight spot that's hard to see directly...

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post #28 of 29 Old 10-12-2018, 06:56 PM
 
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Have you noticed any clutch slipping since you used that oil? I'd go ahead and get it out and put 20w50 motorcycle oil in, synthetic or conventional. I don't think synthetic is really worth it if you change your oil every 1000 miles. I'm only putting about 20 miles a week on my Rebel, so I change it every 6 months, just over 500 miles. I warm the engine up before every ride, and have never found any sign of condensation in the oil. I keep it in the living room.

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post #29 of 29 Old 10-12-2018, 09:54 PM Thread Starter
 
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I'll have to check the air box this weekend. No clutch slipping issues. The odor was very minimal for today's ride.

"Ride Safe, Chop Safer" Motorcycles are not unsafe. However; they are extremely unforgiving of inattention, incompetence, ignorance, and stupidity.
Dismantling, sawzalling, and rattle canning does not make a bobber.
Those are STEPS toward customizing, not customizing unto itself.

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