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#412681 - 01/10/12 2:10 pm Left cylinder smoking badly  
Joined: Aug 2011
Posts: 73
Derrick Atkinson Offline
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Derrick Atkinson  Offline
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Joined: Aug 2011
Posts: 73
Ireland
Hi,
I fitted new pistons ,rings and had the cylinders relined.
I checked the valve movement before assembly and it looked fine.
The bike starts but it runs uneven and is smoking badly from the left cylinder.There is a good spark .The right cylinder appears to run and the plug looks normal.The left cylinder plug is very wet however.
Any ideas.

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#412685 - 01/10/12 2:18 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Aug 2011
Posts: 73
Derrick Atkinson Offline
BritBike Forum member
Derrick Atkinson  Offline
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Joined: Aug 2011
Posts: 73
Ireland
single carb

#412690 - 01/10/12 2:27 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Jan 2006
Posts: 1,838
JD Offline
Moto-Amish
JD  Offline

Moto-Amish

Joined: Jan 2006
Posts: 1,838
Maryland
What type of bike? How many miles on your re-sleeved cylinder?


Josh
#412694 - 01/10/12 2:36 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Aug 2011
Posts: 73
Derrick Atkinson Offline
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Derrick Atkinson  Offline
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Posts: 73
Ireland
The bike is an A10 1956 swing arm, cast iron head.
The liners have 0 miles.

#412697 - 01/10/12 2:40 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Jan 2006
Posts: 1,838
JD Offline
Moto-Amish
JD  Offline

Moto-Amish

Joined: Jan 2006
Posts: 1,838
Maryland
Go for a ride and get the rings seated. Put several hundred miles in the bike. If they're seated properly and the bike still smokes, then you can move on to look at other things. How long have you had the bike?


Josh
#412698 - 01/10/12 2:47 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Mar 2007
Posts: 1,152
Swan Offline
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Swan  Offline

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Posts: 1,152
Winona, MN
Do you park your bike on a side stand or center stand? Believe it or not, parking on a side stand can cause oil to drain and accumulate on your left side causing oil fouling and smoke on start up.


1966 Triton
1962 BSA DBD34 Gold Star
1966 Triumph Bonneville
#412700 - 01/10/12 2:51 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Sep 2002
Posts: 7,812
Alex Online content
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Alex  Online Content

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Seattle
I assume you're burning oil (grey/white smoke) and the offending plug is wet with oil? Couple of possibilities in order of likelihood: Broken oil ring on installation, badly made oil ring not seated, inadequate clearance and smeared piston on startup, assembly lube somehow got on bores preventing rings from seating.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#412701 - 01/10/12 2:54 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Aug 2011
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Derrick Atkinson Offline
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Derrick Atkinson  Offline
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Joined: Aug 2011
Posts: 73
Ireland
No it is petrol and its white smoke.

#412703 - 01/10/12 2:55 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
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Derrick Atkinson Offline
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Derrick Atkinson  Offline
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Joined: Aug 2011
Posts: 73
Ireland
A compression test shows both cylinders 110 psi

#412704 - 01/10/12 2:56 pm Re: Left cylinder smoking badly [Re: Swan]  
Joined: Jan 2006
Posts: 1,838
JD Offline
Moto-Amish
JD  Offline

Moto-Amish

Joined: Jan 2006
Posts: 1,838
Maryland
Originally Posted By: Swan
Do you park your bike on a side stand or center stand? Believe it or not, parking on a side stand can cause oil to drain and accumulate on your left side causing oil fouling and smoke on start up.


Jon-I'd have to disagree with that statement-at least as far as my Lightning's concerned. I thought that was the case until I took my head to Alex's and he pulled the broken guide. If the oil drain holes aren't clogged and the oil is allowed to drain properly, and the guides are sealed tightly in the head (and more importantly aren't broken), I don't see any reason sitting on the side stand would allow oil into the left cylinder. However, that's just my observation on my one bike...not sure about an A10.


Josh
#412705 - 01/10/12 2:58 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
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Derrick Atkinson Offline
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Derrick Atkinson  Offline
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Posts: 73
Ireland
The bike is on the centre stand

#412706 - 01/10/12 3:01 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Jan 2006
Posts: 1,838
JD Offline
Moto-Amish
JD  Offline

Moto-Amish

Joined: Jan 2006
Posts: 1,838
Maryland
Derrick-it is either getting in from the oil ring or the head. Not sure how long you've had the bike or of it's history, but if it was running fine before and the only thing you've done is resleeve the cylinder, I'd take Alex's advice and check the left side rings.


Josh
#412707 - 01/10/12 3:08 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
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Derrick Atkinson Offline
BritBike Forum member
Derrick Atkinson  Offline
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Joined: Aug 2011
Posts: 73
Ireland
I checked again my worst fear its oil .Looks like strip again !!!

#412727 - 01/10/12 4:28 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
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Richard Phillips Offline
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Richard Phillips  Offline
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San Luis Obispo, CA
I put an ring upside down once. Could be that

#412730 - 01/10/12 4:44 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
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Derrick Atkinson Offline
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Derrick Atkinson  Offline
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Ireland
I striped it down and rings look fine. There was a lot of oil on both piston crowns.A oil ring upside down not sure how .They look the same ? I had the valves out and re grinded them without a problem.I will check the left inlet anyhow.
What interesting is that an oil ring originally broke and there was no smoke!

#412731 - 01/10/12 5:02 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Sep 2002
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Alex Online content
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Alex  Online Content

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Seattle
Derrick,

Look closely at the oil rings (it doesn't matter which way around they go). Do they have an even shine all the way around? Or do they have shiny spots?

Here's another thought....are you sure you're not wetsumped?


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#412735 - 01/10/12 5:20 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
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Derrick Atkinson Offline
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Derrick Atkinson  Offline
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Posts: 73
Ireland
The rings are new .The valve collars checked and are ok.Wet sumping was not a problem before .I will drain it though.
The timing case is off as I was doing the timing . I just did a few quick test starts .

#412741 - 01/10/12 5:30 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Sep 2002
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Alex Online content
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Alex  Online Content

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Seattle
I've had new aftermarket rings that were complete junk. You could see three shiny spots where they touched the cylinder wall...they were not even close to round. The bike smoked accordingly.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#412745 - 01/10/12 5:47 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Apr 2005
Posts: 1,581
Adam M. Online content
BritBike Forum member
Adam M.  Online Content
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Joined: Apr 2005
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Mississauga, Ontario.
Is your second ring without a taper ?
If it has a taper, and is upside down it will pump oil into left cylinder.
But reading that both pistons crown are covered with oil I suspect valves. Did you check your valve / guide clearances during regrinding ?
If your valves went into guides like a stone in the well, the clearances were too big.

Last question - when was a bike smoking, on acceleration or during deceleration ?

#412768 - 01/10/12 7:57 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Feb 2007
Posts: 2,200
Semper Gumby Offline
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Semper Gumby  Offline
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Atlanta, GA USA
Take the rings off the piston and put them in the cylinder and check the end gap. Make sure they were all installed correctly. If I remember correctly rings have a faint stamp or mark next to the gap. They should be installed stamp facing up toward the cylinder head. If you got a top ring installed up side down then it will scrape oil in the wrong direction? I may be wrong about this. It's been a while.

Also check the valve guides and the valves. If the clearence between the two is too large it can suck oil from the cylinder head. I had this problem with my T-bolt after its rebuild. I ended up rebuilding the head as well. Also the Emgo rings got changed out for Hepolites.

Good luck.


Gaggle of BSAs
a Honda
an old BMW
and a Montesa
Parking lot Elf in training
#412810 - 01/10/12 11:43 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
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Derrick Atkinson Offline
BritBike Forum member
Derrick Atkinson  Offline
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Posts: 73
Ireland
The piston and rings were supplied by SRM .The pistons are from Taiwan and the rings Italian.The Taiwan rings are not good.
I cannot see any markings on the rings but they could be in wrong way up.I will check.
The valve clearance is ok.

#412823 - 01/11/12 12:41 am Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Mar 2005
Posts: 9,964
John Healy Online content
John Healy  Online Content


Joined: Mar 2005
Posts: 9,964
Boston, Massachusetts
Originally Posted By: Derick Atkinson
No it is petrol and its white smoke.


White smoke oil.
Black smoke fuel.

The A10 GPM Italian pistons we have in stock have grey cast iron rings with no markings as to top. They also do not have a chamfer on the top back edge to indicate top.

So here's the real story:
We have dealers that have had good luck with Emgo - Taiwan, GPM Italian, what passes today as Hepolite, Hastings and Deves rings.

We have dealers that have had nothing but bad luck with Emgo - Taiwan, GPM Italian, what passes today as Hepolite, Hastings and Deves rings.

We have dealers who never have any problems with rings and we have dealers that consistently have problems with rings.
______________________
Matching the cylinder bore surface finish to the rings being used, and how carefully you remove and install the rings, is every bit as important, IMHO more, than the ring gap.

Grey cast iron rings are really designed to be used with cylinder bores that are held to a tolerance .0005" to .001. and a maximum grit stone of 220. Most of the dealers I know who are successful at getting the rings to seat use 180 grit stones. This means that there can be as much taper top to bottom of .001 inch and out of round .001".

Typically it is hard to get these old cylinders to a tolerance close to .0005". It is not uncommon for a cylinder to warp in the hours after it was bored. The technician might have had the cylinder perfectly round with no taper from top to bottom (or close) but let the cylinder set over night and measure it again. Thus a lot of technicians bore the cylinder one day and finish hone it the next. This gives the cylinder a chance to stabilize before you hone it. Yes, when you remove the hardened skin that is the cylinder bore it releases tensions that have built up in the cylinder over the years.
-------------------
Steel and Ductile Iron rings are designed to be used in a cylinder that is held to a tolerance of .0002" or less. These cylinders are typically finished with a stone with a 280 grit of finer. A cylinder must be designed from the git-go to be able to attain, and hold these kinds of tolerances. Because the cylinder is nearly perfectly round after honing they do not need to be finished honed (like our old hunks of iron we call cylinders) by the rings in service. The rings are also lapped perfectly round during production and little, if any "ring Break-in" is required.


#412920 - 01/11/12 2:32 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
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Derrick Atkinson Offline
BritBike Forum member
Derrick Atkinson  Offline
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Joined: Aug 2011
Posts: 73
Ireland
I found the problem.The centre compression ring has a step which must face down.Pity SRM did not send instructions with the rings .
The Haynes manual has nothing about fitting them.
What's the next problem....

#412922 - 01/11/12 2:37 pm Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
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Derrick Atkinson Offline
BritBike Forum member
Derrick Atkinson  Offline
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Posts: 73
Ireland
Thanks for all the advice !!

#413015 - 01/12/12 12:10 am Re: Left cylinder smoking badly [Re: Derrick Atkinson]  
Joined: Mar 2005
Posts: 9,964
John Healy Online content
John Healy  Online Content


Joined: Mar 2005
Posts: 9,964
Boston, Massachusetts
Historically AE top two rings for these motorcycles are taper faced and always marked as to which side is the top. Even the latest iteration of AE/Federal Mogul brand made by Goetze made in Germany have "top" on the two compression rings.

What you are describing does not sound like AE rings to me.


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