Exhaust Stink - The Final Chapter (Survey Inside) - Wrist Twisters
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post #1 of 65 Old 05-05-2015, 05:43 PM Thread Starter
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Exhaust Stink - The Final Chapter (Survey Inside)

Hi everyone,

In an effort to get to the bottom of what causes the exhaust stink/fume/smell issue on the Honda 919, I have created a survey.

Please complete the survey below with as much detail in answer fields as possible - this will help to narrow down the cause/fixes to the exhaust smell issue.

I will publish the results on here once I have received enough responses.

Survey:

https://www.surveymonkey.com/s/FS6RXMT

You can view the results of the survey here:
Survey Results

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post #2 of 65 Old 05-05-2015, 05:43 PM Thread Starter
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post #3 of 65 Old 05-05-2015, 05:55 PM
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Hasn't this been determined already? After trying everything, went with a low mount exhaust. Problem solved. If you search, you will find more than you wanted to know on this topic. Sorry if I pooped in your cereal.

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post #4 of 65 Old 05-05-2015, 06:19 PM
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The problem is already well known. The version of Honda PGM-FI on the 919 (and some other Hondas) does not have feedback loop capability - no oxygen sensor - and it fuels based on a chart without the ability to check what's really going on. It tends to run rich. Combine that with the fact that the high pipes exhaust straight into the static air pocket behind the rider and you get 'the stink'. This phenomenon also happens to some cars.

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post #5 of 65 Old 05-05-2015, 06:36 PM Thread Starter
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Quote:
Originally Posted by bartsitarski View Post
Hasn't this been determined already? After trying everything, went with a low mount exhaust. Problem solved. If you search, you will find more than you wanted to know on this topic. Sorry if I pooped in your cereal.
I'm well aware of this, I am simply trying to document all of the options to see what has and hasn't worked.

Some people have the stink, others do not.

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post #6 of 65 Old 05-05-2015, 06:51 PM
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Quote:
Originally Posted by The End View Post
I'm well aware of this, I am simply trying to document all of the options to see what has and hasn't worked.

Some people have the stink, others do not.
OK. Cool. I took the survey with the last setup I had for reference.

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post #7 of 65 Old 05-05-2015, 08:57 PM
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Some people also can't smell...Did you account for that in your survey? Lol

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post #8 of 65 Old 05-06-2015, 04:51 AM
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Put me down as one of them that can't smell.
Seriously, I know I do not have a good nose so the exhaust smell never has botherd me. Not trying to discredit your survey....its just the truth. some of us can't smell as good as others.

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post #9 of 65 Old 05-06-2015, 08:14 AM
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Upon purchasing my second 919, the very first purchase I made was a 900RR system to get rid of the horrid stench.

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post #10 of 65 Old 05-06-2015, 09:11 AM
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I have a pretty good sense of smell and I rarely notice the stink on my stock bike. A couple times I've noticed it on my backpack or something I just took out of the tailbag right after I get off the bike, but I've never gotten it as bad as people talk about and nobody's ever complained that I smell like exhaust either. Curious to see the results from the survey.

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post #11 of 65 Old 05-06-2015, 09:55 AM
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Quote:
Originally Posted by derpydog View Post
I have a pretty good sense of smell and I rarely notice the stink on my stock bike. A couple times I've noticed it on my backpack or something I just took out of the tailbag right after I get off the bike, but I've never gotten it as bad as people talk about and nobody's ever complained that I smell like exhaust either. Curious to see the results from the survey.

wonder if elevation/temperature plays a role in the stink

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post #12 of 65 Old 05-06-2015, 10:51 AM
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Must also account for height and weight of the rider as this would add to the pocket of air behind them.
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post #13 of 65 Old 05-06-2015, 11:29 AM
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Even though I can't feel much of a difference from my pc3, I can report that the stink is now pretty much gone. So that is another potential alternative to going the 900rr exhaust route.

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post #14 of 65 Old 05-06-2015, 12:20 PM
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Quote:
Originally Posted by op_man1 View Post
Even though I can't feel much of a difference from my pc3, I can report that the stink is now pretty much gone. So that is another potential alternative to going the 900rr exhaust route.
You're definitely in the minority then... most people with a power commander don't notice a difference in smell

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post #15 of 65 Old 05-06-2015, 12:52 PM
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People who can't smell it just have a higher ambient stink, so there isn't much of a difference.

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post #16 of 65 Old 05-06-2015, 02:00 PM
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Quote:
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You're definitely in the minority then... most people with a power commander don't notice a difference in smell
Could be that I am just getting old (and my sense of smell is going to hell), but my cloths definitely do not stink anymore when I get into the office. Before, I felt halfway to having been on a 2 stroke snowmobile...

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post #17 of 65 Old 05-06-2015, 03:10 PM
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Quote:
Originally Posted by SGKukov View Post
wonder if elevation/temperature plays a role in the stink
Yes, I've wondered that too, along with regional variations [Euro/US/Asia-Pacific bikes], regional fuel variations etc., because it seemed to be more of a problem for US riders.

But The End lives within miles of me, will be buying similar fuels and is certainly running at the same elevations and in the same temps...His bike stinks, and mine never has, so bang go some of those fine ideas...

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post #18 of 65 Old 05-06-2015, 04:34 PM
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Quote:
Originally Posted by Wolf View Post
Must also account for height and weight of the rider as this would add to the pocket of air behind them.
I hope this isn't the explanation for why more US riders get "the stink", but...

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post #19 of 65 Old 05-06-2015, 04:55 PM
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I'm with derpydog; I have a keen sense of smell, but I've never noticed it or had any complaints. And just to check I just smelled my jacket, and there's not a hint of stench on it. For a while I thought it was because of my alu-rack, but I took that off a couple weeks ago and have not noticed any difference.
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post #20 of 65 Old 05-06-2015, 05:12 PM
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Quote:
Originally Posted by derpydog View Post
I hope this isn't the explanation for why more US riders get "the stink", but...
I've spent whole days riding with a female companion - our combined weight and bulk must be close to that of the average US male [just kidding; don't send the drones] - with high pipes and no evidence of stink.

And this is someone who clicks the car A/C to recycle at more than one part per million of exhaust fumes in the car, so if there had been any stink, I would have heard about it.

So, it appears that some bikes are stinkers, and others aren't - the why part remains...

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post #21 of 65 Old 05-07-2015, 02:29 AM Thread Starter
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Turns out I can't edit my second post to add in the results... Hopefully a mod can put the information in this post in my second post, for easy viewing.


You can view the spreadsheet of data here:
https://docs.google.com/spreadsheets...it?usp=sharing

12/20 people surveyed had the exhaust smell.


Smell:
  • 11/12 with the smell had the stock air filter.
  • 10/12 with the smell had a stock or stock debaffled exhaust system.
  • 7/12 with the smell had the stock oil filter.
  • 5/12 with the smell had a windscreen.
  • 4/12 with the smell had a luggage rack.


No Smell:
  • 100% of people with the 900rr set up had no smell.
  • Only 2 people with a completely stock exhaust system did not have the smell.

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post #22 of 65 Old 05-07-2015, 04:03 AM
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Quote:
Originally Posted by K1w1Boy View Post

I've spent whole days riding with a female companion - our combined weight and bulk must be close to that of the average US male [just kidding; don't send the drones] - with high pipes and no evidence of stink.
I wonder if people outside of N America or possibly just outside of the USA, don't experience it as bad since they don't use ethanol. Or do they (use ethanol)?

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post #23 of 65 Old 05-07-2015, 05:36 AM
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Originally Posted by andrewebay1 View Post
I wonder if people outside of N America or possibly just outside of the USA, don't experience it as bad since they don't use ethanol. Or do they (use ethanol)?
I ran ethanol free gas last year riding at Deals Gap... Still stunk.

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post #24 of 65 Old 05-07-2015, 08:19 AM
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A single high mount exhaust; such as that of the 599 gets rid of the stink as well. My guess is the way the gas flow is handled in the stock setup 4-2-1-2.

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post #25 of 65 Old 05-07-2015, 01:04 PM
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I ran ethanol free gas last year riding at Deals Gap... Still stunk.
Conversely, I have run normal gas through mine and noticed no increase in smell compared to the ethanol free I normally run. So gas doesn't seem to be the culprit.

Elevation for the town I live in is 2,352 ft above sea level. Derpydog (and anybody else), what elevation are you at since you didn't notice it either?
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post #26 of 65 Old 05-07-2015, 01:12 PM
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I live pretty much at sea level, but I've had it up to 6k ft and not noticed any change in smell.

What about type of riding? I do probably 75% of my miles either freeway commuting in light traffic or riding backroads/mountain passes, vs city riding or stop-and-go rush hour traffic.

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post #27 of 65 Old 05-07-2015, 01:18 PM
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Quote:
Originally Posted by arshishb View Post
A single high mount exhaust; such as that of the 599 gets rid of the stink as well. My guess is the way the gas flow is handled in the stock setup 4-2-1-2.
Nah, I still get it with my 599, it's just not as bad.

It's completely about exhaust placement. Add in the size of the rider, how far back they sit on the seat, kind of materials in the clothes they wear, etc.

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post #28 of 65 Old 05-07-2015, 01:39 PM
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Odd to see the suggestions that the problem could be related to the size of the rider. I'm basically a stick figure at 5'9" and 150lbs. My brother has the same build and we both find the stink unbearable with the stock setup. 900RR system is going on his bike soon, as well.

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post #29 of 65 Old 05-08-2015, 08:24 AM
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Both my '03 and '06 produce no stink. Both have shields, one has yoshimura cans,the other is stock exhaust. Each have top box with the '03 having side bags.



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post #30 of 65 Old 05-08-2015, 01:49 PM
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Quote:
Originally Posted by ST-DocLizard1 View Post
Both my '03 and '06 produce no stink. Both have shields, one has yoshimura cans,the other is stock exhaust. Each have top box with the '03 having side bags.
Then your top box is what's carrying all that exhaust away from you. It's essentially 'you', now. Drape some cloth over it (secure it), then go for a ride then give the cloth a sniff. It'll stink

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post #31 of 65 Old 05-08-2015, 03:13 PM
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Quote:
Originally Posted by g00gl3it View Post

Then your top box is what's carrying all that exhaust away from you. It's essentially 'you', now. Drape some cloth over it (secure it), then go for a ride then give the cloth a sniff. It'll stink
I ride with a givi 53l top box and still get the sink. It improved with non ethanol gas

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post #32 of 65 Old 05-08-2015, 05:36 PM
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I never notice a stink, from stock to modded, but then I really dont care if my leathers smell. Just ride the damn thing and enjoy

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post #33 of 65 Old 05-08-2015, 05:54 PM
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Mine with stock header and Dan moto. No stink.
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post #34 of 65 Old 05-08-2015, 10:33 PM
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Quote:
Originally Posted by BockHawk View Post
Odd to see the suggestions that the problem could be related to the size of the rider. I'm basically a stick figure at 5'9" and 150lbs. My brother has the same build and we both find the stink unbearable with the stock setup. 900RR system is going on his bike soon, as well.
Add 5" to your height and that's my build. I have MIVV x-cones and the stink exists.

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post #35 of 65 Old 05-11-2015, 04:44 AM
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Quote:
Originally Posted by andrewebay1 View Post
I wonder if people outside of N America or possibly just outside of the USA, don't experience it as bad since they don't use ethanol. Or do they (use ethanol)?
I don't think we do - there's an ethanol blend in Australia, but I don't hear about it here...

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post #36 of 65 Old 05-11-2015, 08:28 PM
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Yes we do. I tried it once quite a while back in my Honda Civic. From memory I think it was Gull on the North Shore. I prefer non ethanol fuel for technical and other reasons anyway.

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post #37 of 65 Old 05-11-2015, 10:44 PM
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Would there be ethanol in run-of-the-mill 91, though?

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post #38 of 65 Old 05-12-2015, 01:32 AM
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My 599 has an MIVV can. The carbs have been rejetted. Little to no stench.

The 990 Super Duke has very little stench. Maybe 5-10% of a 919.

The 390 Duke has, IMHO, the perfect exhaust. It's as far away from your head as possible. It's ultra clean and quiet. It's really a nice break from the other 2 noise makers.

Part of the reason the 919 stinks so badly is because it's tucked in a vacuum. I put extensions on my baffelectomized cans, and the stench went away.

Running 87 octane supposidly helps because that's the grade of fuel the bike was designed to run.

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post #39 of 65 Old 05-12-2015, 07:23 AM
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i can smell my farts when sitting at a light........exhaust? not.

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post #40 of 65 Old 05-12-2015, 09:56 AM
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I have the shorty dual dan moto carbon gps on with stock header and I smell nothing. Only time I smell exhaust is when I back out of my parking spot :P

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