Author Topic: Smokey start  (Read 7516 times)

Offline bikesnbones

  • ^ Proficient Motobricker
  • Posts: 113
Smokey start
« on: March 27, 2015, 03:55:12 AM »
Hi All
My K smokes on start up.
Just for a minute or so.
The smoke is a kind of dirty grey colour.
I didn't pay it much attention during the Winter, as I assumed it was just burning off the condensation.
It does stop quite quickly.
I always store mine on the centre stand, never on the side stand.
Is this normal behaviour.
I should add that I never get smoke on start up when the bike is warmed up.
Only when starting up from stone cold.
I do use a bit of oil, but not much, and certainly nowhere near what I have read BMW suggested was acceptable.
Your thoughts appreciated.
  • Peterborough UK

Offline rbm

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Re: Smokey start
« Reply #1 on: March 27, 2015, 07:32:40 AM »
Where is the oil level in the sight glass with engine off?  It should be halfway up, not covering the glass.
  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline bikesnbones

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  • Posts: 113
Re: Smokey start
« Reply #2 on: March 27, 2015, 08:39:45 AM »
Where is the oil level in the sight glass with engine off?  It should be halfway up, not covering the glass.

Actually, I have it quite high.
Way above the middle, but not completely covering the class.
Just a bit of air at the top.
About 5mm
Could that be the cause.
 :yow
  • Peterborough UK

Offline TimTyler

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Re: Smokey start
« Reply #3 on: March 27, 2015, 09:06:10 AM »
Can you be more specific than "my K"?

Offline bikesnbones

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  • Posts: 113
Re: Smokey start
« Reply #4 on: March 27, 2015, 09:12:10 AM »
Can you be more specific than "my K"?

Sorry yes.
BMW K1100RS - 1993
  • Peterborough UK

Offline nsarvai

  • Motobrick Curious
  • Posts: 26
Re: Smokey start
« Reply #5 on: April 03, 2015, 09:34:40 AM »
I have been around BMWs my whole life... This is a common thing due to BMWs engine layouts and exhaust...
If you keep your bike on the side stand, there are leftover fumes and gases that will stay in the exhaust because its on the left side of the bike and will be the lowest portion of the bike. Then when you started up they will come out the exhaust (Smoke).
 
Storing yours on the center stand the exhaust might still be lower and you will have the collections still.

I have a K75RT that has done it a couple times! I also have a R60 that does it more.  My uncle has a new RR That does it. As far as I know it doesn't hurt the bike or anything, its just gases escaping the engine at start up.

Hope this helps out!
  • New Hampshire
  • 1994 BMW K75RT
Nic
My Garage,
1986 BMW R60
1994 BMW K75RT
2009 Honda Rebel

Offline bikesnbones

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Re: Smokey start
« Reply #6 on: April 03, 2015, 12:09:07 PM »
I have been around BMWs my whole life.

Then you might be able to offer some advice by a more recent, serious development.
The other day, I was riding along, at a fair old pace when I felt a sudden surge of heat from the engine.
Temp gauge showed normal, so I carried on.
The she started misfiring, so I pulled over and noticed coolant on the heat shield that sits below your left foot, running up the length of the silencer.
I limped home, and quickly discovered that number 2 cylinder is not firing.
I took the plug out, and was greeted with this horrible sight.
 :eek:

So I replaced the plug, but still no fire,
There is a spark.
Any thoughts
 :dunno
  • Peterborough UK

Offline The Mighty Gryphon

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Re: Smokey start
« Reply #7 on: April 03, 2015, 04:12:17 PM »
Any idea on where the coolant came from?
  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline bikesnbones

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Re: Smokey start
« Reply #8 on: April 03, 2015, 05:32:30 PM »
Any idea on where the coolant came from?

I wish I knew.
I've removed the fairing bellypan and lowers, shone a torch in there but can't see a sign of anything anywhere.
I suspect it must have come out of a breather somewhere.
Really strange.
I'm thinking head gasket failure as a possibility, but that doesn't explain why cylinder 2 is not firing with a healthy spark
 :dunno2:

  • Peterborough UK

Offline thor0864

  • Motobrick Curious
  • Posts: 26
Re: Smokey start
« Reply #9 on: August 01, 2015, 10:44:05 AM »
I always park on the center stand because I've read Ks typically smoke when left tilted on side stand, something about where tje oil comes to rest in this position. This is the case with my bike.
  • Ottawa, Canada
  • 1986 K100

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