BMW K bikes (Bricks)

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1Back to top Go down    1990 k100 rs 16v on Mon Aug 03, 2015 6:02 pm

marknico

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Hi after abit of advice - smelt burning oil on a ride out and my friend saw some blue smoke on heavy acceleration prior to this it had been parked on the side stand - I know the 8v models suffered with burning oil after being on the side stands but thought 16v didn`t suffer with this issue ?

Also wouldn`t it burn off quickly mine was smoking after a 30 minute ride - any other issues what would cause this other than knackered piston rings ? Bike has done 85k miles would an oil change help or even a thicker grade oil or am I just hoping ?

Seems to smoke only on heavy acceleration although it did smoke on start-up after being on the side stand for a few days - just worried engine is worn although power dosen`t seem to be affected ?

Thanks Mark.......

    

2Back to top Go down    Re: 1990 k100 rs 16v on Mon Aug 03, 2015 7:39 pm

indian036

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Hi Mark,

Another thing that can cause smoke is valve stem seals worn and no longer sealing properly. Especially noticeable if valve guides are worn too.

Worn rings will do it, as you say, but have to be very worn for power to be obviously affected to the rider's subjective feel. Different if you have a dyno in your shed.Wink

A compression test is the next step. Ideally, activate the starter relay without ignition switch on by a bypass switch from the battery so fuel isn't injected and spark isn't generated. Throttle wide open.

If the compression is low or significantly uneven, repeat with a squirt or 2 of engine oil to the cylinder through the spark plug hole. If the compression lifts significantly, rings are your problem.

Re oil grade, many modern low friction design engines are very fussy about oil type/grade, but the K is old enough to not be greatly fussy. Exception is that a heavy grade can compensate for a very worn engine to a limited extent.

Bill


__________________________________________________
1985 K100RT Red. VIN 0028991K100RT ENG 104EA248523386
1985 K100RT Blue. VIN 0029036K100RT ENG 104EA25852071
1990 K100LT Black. VIN WB105060310190452
1984 K100RT White. VIN. 0023022K100RT ENG 104EA32848523
    

3Back to top Go down    Re: 1990 k100 rs 16v on Mon Aug 03, 2015 8:01 pm

Waz

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mine stopped smoking after I replaced valve seals


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1987 K100 RS
1997 R1100R
    

4Back to top Go down    Re: 1990 k100 rs 16v on Mon Aug 03, 2015 8:41 pm

RicK G

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The 16v engines do smoke after being on the side stand. My K1100 is really good at it.
To investigate do a compression test and if anything is suspect then do a leakdown test.
Heavy grade oil will not help worn rings, the only thing that helps them is new rings.
Make sure the oil levels are right, don't go past the half way mark on the sight glass.


__________________________________________________
If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

5Back to top Go down    Re: 1990 k100 rs 16v on Mon Aug 03, 2015 11:32 pm

Holister

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My old girl was a chronic smoker when I picked her up Laughing . Very oily/sooty/smelly exhaust. The PO had used about a litre tooo much oil. I just fill with around 3lit and then gradually top up till I see it in the sight glass. I always find it takes a little less than the manual specifies. No more smoke and clean exhaust.


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

6Back to top Go down    Re: 1990 k100 rs 16v on Tue Aug 04, 2015 4:54 am

marknico

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@marknico wrote:Hi after abit of advice - smelt burning oil on a ride out and my friend saw some blue smoke on heavy acceleration prior to this it had been parked on the side stand - I know the 8v models suffered with burning oil after being on the side stands but thought 16v didn`t suffer with this issue ?

Also wouldn`t it burn off quickly mine was smoking after a 30 minute ride - any other issues what would cause this other than knackered piston rings ? Bike has done 85k miles would an oil change help or even a thicker grade oil or am I just hoping ?

Seems to smoke only on heavy acceleration although it did smoke on start-up after being on the side stand for a few days - just worried engine is worn although power dosen`t seem to be affected ?

Thanks Mark.......
What I can`t understand is that I`m sure it didn`t smoke prior to me leaving it on the side stand but surely the oil would burn off quickly not smoke after 30 mins underload ?

    

7Back to top Go down    Re: 1990 k100 rs 16v on Tue Aug 04, 2015 8:15 am

indian036

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@RicK G wrote:The 16v engines do smoke after being on the side stand. My K1100 is really good at it.
To investigate do a compression test and if anything is suspect then do a leakdown test.
Heavy grade oil will not help worn rings, the only thing that helps them is new rings.
Make sure the oil levels are right, don't go past the half way mark on the sight glass.
Rick is right about heavy oil and rings. I should have been more specific - heavy oil can help with worn bearings to some extent, but never as well as a rebuild.

What is your usual practice with side or centre stand? (I usually leave it on the centre stand between rides, and side stand during rides or shorter stops.)

Have you re-checked the oil level yet? It should be on the centre stand when checked. If it is in the middle of the sight glass when on the side stand, it is over full.

Cheers,

Bill


__________________________________________________
1985 K100RT Red. VIN 0028991K100RT ENG 104EA248523386
1985 K100RT Blue. VIN 0029036K100RT ENG 104EA25852071
1990 K100LT Black. VIN WB105060310190452
1984 K100RT White. VIN. 0023022K100RT ENG 104EA32848523
    

8Back to top Go down    Re: 1990 k100 rs 16v on Tue Aug 04, 2015 8:30 am

marknico

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@indian036 wrote:
@RicK G wrote:The 16v engines do smoke after being on the side stand. My K1100 is really good at it.
To investigate do a compression test and if anything is suspect then do a leakdown test.
Heavy grade oil will not help worn rings, the only thing that helps them is new rings.
Make sure the oil levels are right, don't go past the half way mark on the sight glass.
Rick is right about heavy oil and rings. I should have been more specific - heavy oil can help with worn bearings to some extent, but never as well as a rebuild.

What is your usual practice with side or centre stand? (I usually leave it on the centre stand between rides, and side stand during rides or shorter stops.)

Have you re-checked the oil level yet? It should be on the centre stand when checked. If it is in the middle of the sight glass when on the side stand, it is over full.

Cheers,

Bill

Hi Bill usually I leave it on centre stand as a rule but was on side stand for approx. a week while I waited for some parts to arrive - oil is just above centrered dot in my sight glass when on main stand - but I think it would burn off quickly when started shouldn`t be getting blue smoke under heavy acceleration me thinks ? I ll see how it goes now I`m leaving it on the main stand ? Cheers

    

9Back to top Go down    Re: 1990 k100 rs 16v on Tue Aug 04, 2015 8:50 am

indian036

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Hi Mark,

Oil level is good, and as you correctly say, it wouldn't normally smoke that long even after a week on the side stand.

Back to the valve stem seals or rings. Compression test next. Hopefully, it'll be like Waz and valve stem seals will fix it. Easier than a rings replacement, can be done without removing the head.

Bill


__________________________________________________
1985 K100RT Red. VIN 0028991K100RT ENG 104EA248523386
1985 K100RT Blue. VIN 0029036K100RT ENG 104EA25852071
1990 K100LT Black. VIN WB105060310190452
1984 K100RT White. VIN. 0023022K100RT ENG 104EA32848523
    

10Back to top Go down    Re: 1990 k100 rs 16v on Tue Aug 04, 2015 1:06 pm

marknico

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@indian036 wrote:Hi Mark,

Oil level is good, and as you correctly say, it wouldn't normally smoke that long even after a week on the side stand.

Back to the valve stem seals or rings. Compression test next. Hopefully, it'll be like Waz and valve stem seals will fix it. Easier than a rings replacement, can be done without removing the head.

Bill

Cheers Bill

    

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