Bike Smoking when coming off revs, Rider behind said smells very rich after new

[Xdiavel]

Hi all,

On my last ride last year and the first ride after the installation of my Delkavic headers & link pipe and Pipe werx cans I noticed something concerning, At the end of the ride (approx 130 mls) I pulled up in a nice quiet area to get off the bike to admire Her and to have a good listen to the new pipes as had no chance of upsetting neighbours etc.

At first all was good, sounded fine,Revs fine & no smoke but then after it was idling for a little while I started to see lingering plumes of smoke coming from mainly the near side Exhaust can and this progressively got worse!

I stopped several times on the way home as was concerned and it was still doing it. When on power, no smoke but when the revs are dropping it throws out smoke.
My friend following behind said it smelt very rich. I asked a few people on the facebook page and they have said they have changed their pipes with no issues, But unsure if this was just rear cans and not the headers.
I did put the original silencers back on last night and it did not seem half as bad just a puff every now and then and very light. I am really confused now as to what is going on. I will post a link below to show it when I ran it up Yesterday.

https://www.youtube.com/watch?v=ZiTguDFj7Fs


Things done over the winter to the engine so far,
Throttle body sync
Full service inc plugs/air filter  *Plugs were fine ie no sooting* But then the exhaust was newly fitted.
Full exhaust fitted.

Bike has 8500 mls and has been very well looked after.

[Hooli]

I'd take a guess at valve stem seals. Blue smoke is normally oil & with a closed throttle the intake vacuum is the highest so most likely to draw oil past weak seals.

We've seen a few bikes starting to suffer this, all seem to have been run on fully synth oil. It seems as these bikes are designed for semi-synth they need the mineral part to keep the seals in good conditon.

[Xdiavel]

I'd take a guess at valve stem seals. Blue smoke is normally oil & with a closed throttle the intake vacuum is the highest so most likely to draw oil past weak seals.

We've seen a few bikes starting to suffer this, all seem to have been run on fully synth oil. It seems as these bikes are designed for semi-synth they need the mineral part to keep the seals in good conditon.

Hi Hooli,

That was my first thought also but then a big symptom of that is smoking when cold as the seals may weep over night? This runs fine when cold with no smoke at all but longer it idles the worse it seems to get and would imagine it would still be the same regardless of what exhaust is on the bike as seemed much better with the old exhausts on?
I do need to do more testing but wouldn't hurt to get the seals all done regardless as it's 21 yrs old now I suppose. Do you happen to know the approx cost to have this done ( not via main delaer)

Thanks for your input 

Kind regards
Lee

[Hooli]

Not a clue on getting it done sorry, I never pay a garage for stuff. I know head gaskets aren't cheap though.

I wonder if it's cause the oil is thinner once warm? just a guess, I'd think it'd do it overnight too.

[Hooli]

My guess exhaust wise is with bigger bore & less restrictive pipes on the smoke gets out rather than getting caught on the walls.

[seth]

Before ripping it all apart it might well be worth checking the small round seals around the pairs valves between the head and the rocker cover as if they have gone hard they'll let oil into the valves .

[Hooli]

Before ripping it all apart it might well be worth checking the small round seals around the pairs valves between the head and the rocker cover as if they have gone hard they'll let oil into the valves .

Good call. I'd thought there was something about Pairs, but I couldn't remember what.

[seth]

Before ripping it all apart it might well be worth checking the small round seals around the pairs valves between the head and the rocker cover as if they have gone hard they'll let oil into the valves .

Good call. I'd thought there was something about Pairs, but I couldn't remember what.

Folks forget the ages of these bikes now and those seals are never checked I also thing they don't do well I the wrong oil has been used at anytime during the bikes life   

[Xdiavel]

Before ripping it all apart it might well be worth checking the small round seals around the pairs valves between the head and the rocker cover as if they have gone hard they'll let oil into the valves .

Good call. I'd thought there was something about Pairs, but I couldn't remember what.

Folks forget the ages of these bikes now and those seals are never checked I also thing they don't do well I the wrong oil has been used at anytime during the bikes life   

How do I find these to check them please? Are there any guides available? I just thought the PAIRS systems just to additional air from the air box to the exhaust?

Regards

[Hooli]

No 9 on this diagram I think, @seth will confirm

https://www.suzukiparts.co.uk/shop/online-store/suzuki-parts-finder/gsx/gsx1400/k2-k3-k4-k5-k6-k7-2002-2007.htm?vehicle_id=29#!gsx1400cylheadcover

You are right, it just dumps fresh air into the exhaust. But there's a few seals where it goes through the cam cover & cylinder head to do so.

[seth]

No 9 on this diagram I think, @seth will confirm

https://www.suzukiparts.co.uk/shop/online-store/suzuki-parts-finder/gsx/gsx1400/k2-k3-k4-k5-k6-k7-2002-2007.htm?vehicle_id=29#!gsx1400cylheadcover

You are right, it just dumps fresh air into the exhaust. But there's a few seals where it goes through the cam cover & cylinder head to do so.

Exactly part number 9
Cheers I have difficulty posting pictures 

[Xdiavel]

Thanks guys much appreciated 

So I have just ran out in my break into the Garage and run Her up for approx 15mins with the standard cans on the Delkavic headers and link pipe and zero smoke seen! 

I really have no idea at this point unless it truly is a fuelling issue as the amount of smoke that comes out of it with the Pipe werx on, it would still show signs if Oil related surely? Even though the colour of the smoke does have a very light blue tinge to it.

Trouble is I am reluctant to spend £430 on a Power commander to check this.

[Phill P]

You won't be popular but remove the pipewerx cans and fire up, see if it still looks smokey then. How's your plugs look.

[Hooli]

If anything better headers would make it lean rather than rich. So I can't see them being why it's smoking.

[Xdiavel]

You won't be popular but remove the pipewerx cans and fire up, see if it still looks smokey then. How's your plugs look.

I changed the plugs during the service I gave it in December and they looked perfect tbh