Smoke at start up? 1000SP |
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Jalfrezi
Falcone Joined: 29 Apr 2018 Location: Bristol, UK Status: Offline Points: 93 |
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Just took her out for a fast ride, kept the revs high, after a few miles, no smoke at all. Pulled the plugs, and they are no longer black, just normal looking. Snot is dripping out of the breather, so I'm again changing my mind, and putting this down to condensation, and the chokes.
I will pull the rocker cover though, and see if there is any obvious issues. Thanks all.
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'82 1000SP NT
'04 BMW R1150GSA '04 KTM 640 Adventure |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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+1 all the previous, yes Dave P I had same idea, that perhaps rocker box is filling up. OK yep plugs sooty only because just been started cold. What's happeinng on the 23rd? |
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"Chicken nuggets don't dance on a Tuesday."
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Jalfrezi
Falcone Joined: 29 Apr 2018 Location: Bristol, UK Status: Offline Points: 93 |
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Bike Safe course.
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'82 1000SP NT
'04 BMW R1150GSA '04 KTM 640 Adventure |
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Jalfrezi
Falcone Joined: 29 Apr 2018 Location: Bristol, UK Status: Offline Points: 93 |
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I'm rather hoping I may have found the issue. When I pulled the rocker cover, quite a lot of oil ran down the outside of the cylinder. I park on a hill, and the oil is pooling at the back of the rocker box. Would I be right in thinking that the drain hole is just below the exhaust rocker in the picture? I'll park on the flat, and on the centre stand for a few days, and see if that improves matters, but would be interested in comments. TIA
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'82 1000SP NT
'04 BMW R1150GSA '04 KTM 640 Adventure |
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jpc
Senior Member Joined: 06 Oct 2016 Location: Belgium Status: Offline Points: 651 |
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That's the one, and you'll find the same next to the inlet rocker on the opposite head.
However you park it, it's normal for that amount to remain in the rockerbox after shutting off. Of course parking horizontal results in best drainage, but it shouldn't be an issue unless the guides are excessively worn. Some smoking on startup is not unusual even with good guides. |
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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Have you checked the drain hole for blockages yet?
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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Jalfrezi
Falcone Joined: 29 Apr 2018 Location: Bristol, UK Status: Offline Points: 93 |
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I have not, was looking down the pushrod tubes. Will have a poke around in the drain holes.
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'82 1000SP NT
'04 BMW R1150GSA '04 KTM 640 Adventure |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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If it helps, I just remembered if you leave a BMW boxer on its sidestand overnight you always get clouds of smoke out the left silencer at next start up. It's because the cylinder head is lower than the cylinder base so the rocker box can't drain. This is quite normal, mine did it for years, didn't do any harm. |
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"Chicken nuggets don't dance on a Tuesday."
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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Don`t know this engine but before condemning the valve guides I would check out the valve stem oil seals as these may be brittle with age and allowing the standing oil to pass into the combustion chamber.
CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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Jalfrezi
Falcone Joined: 29 Apr 2018 Location: Bristol, UK Status: Offline Points: 93 |
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I have a feeling that these don't have valve stem oil seals. Perhaps someone more knowledgable can confirm?
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'82 1000SP NT
'04 BMW R1150GSA '04 KTM 640 Adventure |
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iceni
Senior Member Joined: 16 Sep 2014 Location: Colchester Status: Offline Points: 2480 |
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Mine doesn't have valve stem seals.
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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News to me too! None as I can remember. |
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"Chicken nuggets don't dance on a Tuesday."
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George S
Senior Member Joined: 31 Mar 2018 Location: Essex UK Status: Offline Points: 643 |
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I believe that big block engines had bronze guides with no oil seals and small block engines had cast iron valve guides with oil seals as a cost saving exercise.
Superior bronze guides are available for small blocks.
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George
1994 Nevada 1962 Lightweight ducati Bevel Single Son's 1990 1000S to borrow any time |
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