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General Category >> Rubber Side Down! >> 2007 S40 leaking white smoke @ exhaust header
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Message started by ProjectSB350 on 10/17/23 at 08:52:20

Title: 2007 S40 leaking white smoke @ exhaust header
Post by ProjectSB350 on 10/17/23 at 08:52:20

hey y’all.

I tried riding it down the block for the first time last week, it started fine then revved high and died, I tried and again and the same thing. I noticed a little while smoke coming from where the exhaust header connects to the engine. I’m not sure if the two are related or not but I would like to find out so I don’t destroy the engine or tear it apart for no reason! It idles fine but probably idles too low, I just don’t have a good reference point for it. I’ll try attaching a link to Imgur with the video on it. Any help is approciated!

https://imgur.com/a/8GR2sE7

Title: Re: 2007 S40 leaking white smoke @ exhaust header
Post by verslagen1 on 10/17/23 at 09:34:07

Could be an exhaust leak or oil burning off.
Pull the header and check for black carbon then replace the gasket

Title: Re: 2007 S40 leaking white smoke @ exhaust header
Post by Gary_in_NJ on 10/17/23 at 11:49:07

Check your oil and see if it smells like gas. If there is gas in the oil it will vaporize just as you describe.

Title: Re: 2007 S40 leaking white smoke @ exhaust header
Post by Ruttly on 10/17/23 at 11:57:16

Looks like burn off , head plug leaking oil. Unless you just washed it ,then it’s steam. Steam or smoke ?

Title: Re: 2007 S40 leaking white smoke @ exhaust header
Post by ProjectSB350 on 10/17/23 at 12:27:47

I pulled it off and this is exactly how it came off. I didn't see any gasket or anything.

http://https://i.imgur.com/Ax1g3io.jpg
http://https://i.imgur.com/3zQ7OY6.jpg
http://https://i.imgur.com/Rpyvfv3.jpg

Title: Re: 2007 S40 leaking white smoke @ exhaust header
Post by DragBikeMike on 10/17/23 at 15:38:30

I see your gasket. It's a spiral wound gasket. You can see the end of the spiral in this markup. Looks OK to me. I think you just have an oil leak (probably head plug as previously mentioned), or residual oil on the engine and head pipe.

The interior of your exhaust port looks pretty wet. That area is typically dry with a coat of black carbon, sort of like black velvet. Yours looks like it is oily. I would run it for a while and recheck. Is there white smoke coming out of your tail pipe?

Title: Re: 2007 S40 leaking white smoke @ exhaust header
Post by ProjectSB350 on 10/17/23 at 17:38:39

080E017D7F787C4C0 wrote:

Okay, I'll open it up and take a look. I saw that I could use some gasket RTV to seal it in place. Do I need to replace it as well?

There is no smoke coming from the end of the tailpipe, is there a chance the reason it sputters and dies when giving it throttle is caused by that as well?

Title: Re: 2007 S40 leaking white smoke @ exhaust header
Post by ohiomoto on 10/17/23 at 19:28:17

I'm following Gary's lead on this one.

The stalling sounds like the classic failed fuel petcock. It is a common problem on these. It is also the main reason gas will get mixed into the engine oil and could also explain the wet exhaust port DBM pointed out.

Is it a stock petcock?

Also, when did the problem start?
Is this a new problem?
How old is the bike?
How long have you had it?
Did it sit for a long time?

The smoke could be from the oil leak (things DON"T look wet) or gas in your oil. Either way, your video clearly shows an exhaust leak and there appears to be evidence of exhaust blow-by in your pictures. The smoke is being pushed away from its source.

The idle is not alarmingly low. I think 1100 rpm is spec and that equates to 550 bpm.

[media]http://www.youtube.com/watch?v=7WLURU50G-o&t=489s[/media]