BMW K bikes (Bricks)


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FreyZI

FreyZI
Silver member
Silver member
I'll post gaps in a bit, but is there anything to explain mostly tight clearances in '85 K100 2V?

    

Laitch

Laitch
Life time member
Life time member
Wear.
How many miles on the bike? Do you know if the clearances have ever been checked previously?


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1995 K75 90,000 miles
    

FreyZI

FreyZI
Silver member
Silver member
Alda has ~104K mi.  I have no idea when it was last serviced.

Clearances:

I1 .152
I2 .127 (tight)
I3 .127 (tight)
I4 .152
E1 .229 (tight)
E2 .178 (tight)
E3 .279
E4 .229 (tight)

Incidentally, I took the muffler/silencer off to look at header pipes for oil.  Headers from cylinders 2 and 4 appeared oily; 1 and 3 were dry).

    

Rick G

Rick G
admin
admin
What that means is that most of your valve clearances are tight. Not by much and that they have been neglected and need to be rectified. Check them each major service and adjust as necessary.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

Holister

Holister
Life time member
Life time member
Inlets 1 & 4 @ 0.152 I would call tight also. While still in spec (just), I doubt it would be long before they were out as well. Best to re-shim them all to the loose end of the spec.


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1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
 What does it mean that most of my valve clearances are tight Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

charlie99

charlie99
VIP
VIP
its probably an early series motor

there was some speculation about unleaded fuels requiring better metallurgy of the valve train . engineering changes occurred back in the late 85 -86 models that changed the valves and seats for the better

long story short the early models may have softer seats ...allowing for what we call valve regression to happen more quickly when using unleaded fuels (LEADED FUELS PROTECT valve seats and exhaust valves better ) .. ie valve clearances gets tight

regression happens normally as seats and valves wear but in the earlier models this may happen quicker that later models

just get the shims required to make the clearances correct

your Kawasaki dealer usually carries shims for klr 650 bikes , which are a match for our valve shims  so possible readily available  for swapping .

my local Kawasaki service shop does them exchange for $5.00 each ...so could be better cost effective than buying new ?

good luck


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

MartinW

MartinW
Life time member
Life time member
You will need special tools to change the shims, you can get them from mailto:polepenhollow@yahoo.com.
It is also possible to make them, the drawing for the tool specs used to be online but I can't find it, somebody may post it. Basic hand tools needed files, hacksaw can be used although an angle grinder makes it easier. You will also need a welder to attach the handle.
Regards Martin.

    

Chocolate

Chocolate
Life time member
Life time member


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Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
    

duck

duck
Life time member
Life time member
Even though I have the special tools I find it easier just to use a screwdriver.  I put the blade tip parallel to the circumference though.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

FreyZI

FreyZI
Silver member
Silver member
Thanks, all.  More fish to fry, as I've just removed head and this looks to be a more significant project.  I'll start a new thread.

    

FreyZI

FreyZI
Silver member
Silver member
Uff da.  So, I've just gotten the head back from the shop where they did a valve and seat job.  I also had them replace the valve seals while they were in there.  Nothing untoward noted.  Put cylinder head on cylinder block and reassembled the buckets, shims, cams, and caps on the head.  Now instead of the slightly tight gaps I had before, I have essentially zero gap at any shim.  Doesn't seem like anybody who knew what they were doing could put the valve assembly back together wrong (other than maybe lower spring plates upside down?).  Is this normal after disassembly of the valves?  Any suggestions?

Just to allay any potential concerns: copiously oiled parts during assembly, all the buckets and shims are on the valves they were on before, all the caps are in the same, correct places, slow and careful rotation of each camshaft is possible without particular difficulty or noises.

    

indian036

indian036
Life time member
Life time member
A service to the head and valves will usually mean that the valve faces and valve seats will be ground or machined, so the valve will sit slightly higher in the head. This will mean that they will be closer to the cam and so smaller clearances will be expected, with the amount of difference related to how much had to be removed to get a good seal.
If the clearances were unchanged, I'd be suspicious whether they'd done any work at all.  Smile

You will probably need to obtain some new shims, but you may be able to re-use some on different valves to get the right clearances.

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy ROB the Red Old Bike   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Tom the Triple (now on Historic rego too.)
    

FreyZI

FreyZI
Silver member
Silver member
Thanks, Bill.  Perfect explanation.

    

charlie99

charlie99
VIP
VIP
FreyZI wrote:Uff da.  So, I've just gotten the head back from the shop where they did a valve and seat job.  I also had them replace the valve seals while they were in there.  Nothing untoward noted.  Put cylinder head on cylinder block and reassembled the buckets, shims, cams, and caps on the head.  Now instead of the slightly tight gaps I had before, I have essentially zero gap at any shim.  Doesn't seem like anybody who knew what they were doing could put the valve assembly back together wrong (other than maybe lower spring plates upside down?).  Is this normal after disassembly of the valves?  Any suggestions?

Just to allay any potential concerns: copiously oiled parts during assembly, all the buckets and shims are on the valves they were on before, all the caps are in the same, correct places, slow and careful rotation of each camshaft is possible without particular difficulty or noises.

pretty common issue

when I did my head porting project , I asked them how much total they had removed from the valve faces and valve seats ...was about 10 thou in total ...
so I got them to trim the valve stems (length of valves ) by about the same amount ...so result was 7 of the 8 valves were extremely close to spec ...but 1 valve was another 6 thou loose ...I guess they hit that one twice ....lol  

but still in range for a standard shim ..so most were around 2.4 - 2.6 thickness but the rancid one 2.85 ...bugga ...the local kawaski dealer does an exchange service with klr 650 shims for $5.00 each ...so all sorted

good luck


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

jbt

jbt
Life time member
Life time member
I've heard many scary stories about valve recession on BMW engines.
I've also opened and overhauled many BMW engines. Hundreds. From 1970 to 1995.
I've seen ONE recessed (?) seat, measured out of the limits. Only one - exhaust- on only one cylinder.
If unleaded fuel was to blame for this, it would have caused recession on all the cylinders, don't you think?

I would blame the valve guide for destroying the seat instead. The valve has not only a movement in translation but is also turning (it's normal, to spread the wear all around the seat). But when the guide is worn, this rotation is not coaxial anymore, and the valve is grinding and digging in the seat.

Valve guides are wearing much quicker than seats. When they are replaced, valve seats need to be machined to maintain the valve, the seat and the new guide coaxial. So according to me, we should pay attention to the guides much more than to the seats.

    

charlie99

charlie99
VIP
VIP
well interesting you should say that jbt
that is why I reconditioned the head
pitting of the valves was consistent across all valves but much more evident on the exhaust valves

heres an example


What does it mean that most of my valve clearances are tight 2013-010


cleaned up a little

What does it mean that most of my valve clearances are tight 2013-011

and an inlet

What does it mean that most of my valve clearances are tight 2013-012



What does it mean that most of my valve clearances are tight 2013-110

after service  what I put back in


What does it mean that most of my valve clearances are tight 20141210

seats

 What does it mean that most of my valve clearances are tight 2013-013


and after

What does it mean that most of my valve clearances are tight 20141212


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

88

88
Life time member
Life time member
Good idea on shaving the Valve stems/shafts. I'll do that with K1100rs head.

@ Charlie.....did you see how they did the job? Just wondering how they would chuck the flared end of a valve!


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What does it mean that most of my valve clearances are tight Ir-log1188....May contain nuts!What does it mean that most of my valve clearances are tight Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

K1 - 1989 - AKA Titan (unique K1/K1100RS hybrid by Andreas Esterhammer)
K1100RS - 1995. AKA Rudolf Von Schmurf (in a million bits)
K100RS - 1991 AKA Ronnie. Cafe racer project bike
K75RTP - 1994
K75C - 1991 AKA Jim Beam. In boxes. 
K1100LT 1992 - AKA Big Red (gone)
K100LT - 1988 - AKA the Bullion brick. Should never have sold it.
    

Dai

Dai
Life time member
Life time member
Will - you clamp it on the parallel part of the stem and give it a virgin's kiss with the tool.

(Damn - somone's gonna get me with that one).


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

charlie99

charlie99
VIP
VIP
most of the engine re-conditioners have special grinding wheels set at appropriate angles will

for the special performance types they can do a 3 angle cut of the valves ,but many performance mods have geared up for 5 cut angles at exorbitant prices

the refurb of my valves was only a 1 cut angle ...and still within spec for the distance from the valve face (by a certain amount )  I was happy with the angles of the grind to allow the angles of the natural valve profile to flow a 3 angle process , you may have noticed that the exhaust valve had a protruding edge above the valve face , after which was cut back to nearly no protrusion in the edge  and more a straight cut - edge

the tool doing this was like a fine stone on a bench grinder with preset angles on the valve stem guides to the grinder '' there was a heavy reliance of estimation to how much was ground off , by the operator of the equipment

in truth I hadn't done my homework properly and should have measured the lengths from top of seat  to valve stem top  to estimate how much they had either removed  or what ever , I would imagine to do this might have been out of my skillset , with the tools I had to hand .
but may have been replaced into to the cylinder head and reassembled before estimating the top cut required  to fall close to the original shim thickness ..then work with the calculator

hope that answers some questions ?


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

Dai

Dai
Life time member
Life time member
https://www.youtube.com/watch?v=y5nTXDIgWaM

Serco cutters are more common in the UK.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

nobbylon

nobbylon
Silver member
Silver member
I just did my clearances yesterday. Bike has 84k kms and is a very early model so was built to run on leaded. Only 2 inlets were tight. Previous owner didn’t but I will be using shell millenium fuel additive. I think these K engines are fine valve wise on any fuel.

    

Rick G

Rick G
admin
admin
There have been many here who have found the early heads to be quite tolerant to the unleaded fuel but a few have cropped up that have been failing and needed fixing.  Thing is that after 30 years and more the heads probably have been swapped or fixed so fewer and fewer are surfacing and more than likely on engines that have been found in the back of a barn or cave after being there for many years.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

Dai

Dai
Life time member
Life time member
The other thing that helps is the material that the valve seat is made of. I have no idea what BMW used but there was a huge panic in the Guzzi world when leaded fuel went out. Turned out that the valve seats were old enough to have work-hardened and be immune to unleaded fuel. Mind you, I have two burnt-out exhaust valves on the shelf...


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

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