Brown soot...

Repairs, modifications, bling and tings

Re: Brown soot...

Postby Deegee » 18 May 2019, 08:56

£400 is a lot for a minimal improvement, might be worth it for a track addict, but for real world biking you'd see more bang for your buck by spending it on suspension imho.
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Re: Brown soot...

Postby Rossgo » 20 May 2019, 11:18

@Blade yea I see what you mean. I'll save my dosh!

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Re: Brown soot...

Postby Rossgo » 20 May 2019, 11:20

@Deegee only just seen this post but funny as yesterday I looled at suspension was lookong at Ohlins. If I were to get anything it would be Ohlins!!

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Re: Brown soot...

Postby Blade » 20 May 2019, 11:22

Ohlins is good Rossgo, but dont narrow your choice mate, maxton, nitron and ktech are all good shocks.
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Re: Brown soot...

Postby Rossgo » 20 May 2019, 15:06

Nitron isn't far either, think its a UK company isn't it? I wouldn't mind having it but I dont have that sort of dosh really. At the moment it's running well enough for me so i won't be upgrading just yet but it's a thought

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Re: Brown soot...

Postby Blade » 20 May 2019, 15:44

I've always fancied trying a Maxton shock tbh.
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Re: Brown soot...

Postby Deegee » 20 May 2019, 16:52

Just an overhaul and re-spring to your weight will dramatically change the bike in my experience, it needn't cost a fortune either.

Nothing like some Gucci bike bling though. 8)
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Re: Brown soot...

Postby Rossgo » 20 May 2019, 18:30

I'll bear this all in mind

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Re: Brown soot...

Postby StMarks » 26 May 2019, 08:42

(wait) Sussed it.:
Rossgo wrote:....... Also without a baffle sounds great. Not too loud but just a little more fruity and seems to be making it feel smoother. ....

(emo) I'd lay odds that your bike has been set up to run optimally,,,,,,,, without the baffle.!

Hence the darker deposit with the baffle in. (nod)
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Re: Brown soot...

Postby Blade » 26 May 2019, 17:29

I cant remember where we are up to now tbh but surely if the bike was running lean with the baffle in, then it will be running even leaner with the baffle out due to less restriction on the exhaust side, allowing the inlet side to flow more air (wasntme)
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Re: Brown soot...

Postby StMarks » 26 May 2019, 17:56

Blade wrote:I cant remember where we are up to now tbh but surely if the bike was running lean with the baffle in, then it will be running even leaner with the baffle out due to less restriction on the exhaust side, allowing the inlet side to flow more air (wasntme)

Iirc he original concern raised was that the deposit was brown (rather than light tan), suggesting an overly rich mixture mate.?
Therefore my assumption was that removing the installed baffle (that I hadn't even realised he had) weakens the mixture back to correct.?
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Re: Brown soot...

Postby Blade » 26 May 2019, 18:21

Not sure tbh buddy,but I believe were on the same page. just unclear at what point Rossgo had the baffle in.

I'm under the impression perhaps wrongly that the dyno graph results were with the baffle in and it ran weak at the top end, hence my comment removing the baffle would make it leaner.
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Re: Brown soot...

Postby Rossgo » 26 May 2019, 22:20

Ok so the baffle was taken out for the Dyno run. So the brown soot was shown whilst the baffle was in

However i have now Had a nice good run (485 miles in wales) with the baffle out and the brown soot hasn't come back. I have used - unleaded 95, 97 and 99

I think you guys hit the nail on the head with either - the red ex that I had added reacted and created a brown soot or maybe bad fuel when I filled up at the garage at one point through the ridd

Runs lovely without the baffle in and have been told it sounds a little more fruity without it being loud

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Re: Brown soot...

Postby Rossgo » 26 May 2019, 22:21

I thank all you guys with your help with this. I think I'm fairly happy with how this all runs. If it returns I shall let you guys know

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Re: Brown soot...

Postby Blade » 27 May 2019, 00:05

Glad your happy Rossgo.

Did he do any comparison dyno runs with baffle in and baffle out?
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Re: Brown soot...

Postby Rossgo » 27 May 2019, 09:07

No he didn't. He wasnt very sure if the air to fuel ratio would of worked very well if I kept the baffle in so we took it out! To be honest it feels better with it out and sounds better too so I dont fancy putting it back just yet lol!

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Re: Brown soot...

Postby Deegee » 27 May 2019, 10:02

Generally speaking, if the baffle is out, the exhaust back pressure drops, which tends to make an engine run weaker. It’s due to the lower back pressure allowing more of the incoming fuel/air charge to run into the exhaust during the valve overlap. (Pop/bang on overrun)

There are exceptions, but that’s going down the tuned length exhaust route, where it uses positive or negative pressure waves to pull/push the incoming charge during valve overlap. HTH.
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Re: Brown soot...

Postby Rossgo » 27 May 2019, 12:39

Once again great info Deegee

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Re: Brown soot...

Postby Blade » 27 May 2019, 16:28

Degree answered but that's why I asked the question Rossgo.

The guy should have done a run with the baffle in for comparison, especially as it was running lean without it. I suspect the reason he didn't do this is so he can up sell you a remap. If it were me I would go back and say you never ran it on the dyno with the baffle in so I want it running now foc so I have a comparison, as you basically missed this the first time.

You may like the sound of baffle out, but if it was mapped with the baffle in or is on a standard map you may prevent it running lean by reinstalling the baffle which is important.
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Re: Brown soot...

Postby Rossgo » 27 May 2019, 21:28

The bike has standard map. I installed a aftermarket slip on. The downpipes are still standard. At the time he said he couldn't get the probe in for the air to fuel ratio reading with the baffle in. So suggested to take it out as the reader needs to go in quite deep by the look of it

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