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#551277 - 07/04/14 12:09 pm smokey exhaust  
Joined: May 2006
Posts: 148
TriVin Offline
BritBike Forum member
TriVin  Offline
BritBike Forum member

Joined: May 2006
Posts: 148
Warrington, Cheshire, UK
Whilst running the Bonnie on the driveway my son comes up and tells me I have blue smoke coming out of the LH exhaust.
"What's causing that?" says he.
"Ah, son that will be the valve guide. They be be a bit worn" say's I.
"How do you know that" say's he.
"Because that's what my Dad told me when I was 16" I say's.
"But why does it happen?"
"Cus Grandad said so"
"You mean you don't know?"

So here we are. When I shut the throttle I get a bit of blue smoke out of the LH side. When I rev it, nothing. My old Dad told me if it smokes on the overrun it's the valves. If it does it when opening the throttle it's the rings.
How can I convince my son that Grandad was right? What's the more mechanically technical reason? I need to sound like I know what I'm talking about!


Dave
Tiger 100SS 1966
T120V 1972
Vincent Comet 1952
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#551461 - 07/06/14 4:58 am Re: smokey exhaust [Re: TriVin]  
Joined: Oct 2003
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dave jones Offline
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dave jones  Offline
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Joined: Oct 2003
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Emsworth, sunny south of Engla...
This is basically true but on a Triumph twin, according to John Healy, the guides don't cause smoke unless one is actually loose in the head.

Dave

Last edited by dave jones; 07/06/14 5:00 am.
#551475 - 07/06/14 7:39 am Re: smokey exhaust [Re: TriVin]  
Joined: Jun 2010
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MikeinBiddeford Offline
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MikeinBiddeford  Offline
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Maine
The intake vacuum is higher when you shut the throttle, so the oil gets sucked down the valve guide.


Please do not believe anything I write. I am a hack but I like to guess the right answers.

Moderated by  John Healy 


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