BMW K bikes (Bricks)

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1Back to top Go down    Balancing act on Thu Apr 26, 2018 2:10 pm

Neal Cooper

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Hi All,
Refitted clutch plates and then attempted to present the gearbox with it balancing on a bottle jack...Not easy was the conclusion and aborted so as not to do any pointless damage. Will attempt again after rethink. There'd be no fun in it if it was easy I guess.
Neal

    

2Back to top Go down    Re: Balancing act on Thu Apr 26, 2018 2:24 pm

Crazy Frog

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Check this thread Neal: reinstalling the gear box


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

3Back to top Go down    Re: Balancing act on Thu Apr 26, 2018 2:43 pm

duck

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My technique:

Put trans on ground right behind bellhousing.

Sit down on the ground under rear frame right behind it with legs sticking out to the sides a bit.

Pick up transmission, putting elbows on legs for support.

Wiggle it while sliding it on.


__________________________________________________
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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

4Back to top Go down    Re: Balancing act on Thu Apr 26, 2018 2:53 pm

Neal Cooper

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Saw Bert's post and found that helpful and same goes for positioning suggestion.
Doing it from the side is a recipe for sciatica! 
Will revisit this tomorrow and take some pics of the ' Surprised progress'

    

5Back to top Go down    Re: Balancing act on Thu Apr 26, 2018 3:04 pm

Neal Cooper

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This is another bit of 'fun' - dented tank... Tried pulling dent with one of those kits with glue and tabs (didn't make the slightest bit of difference. have now resorted to using filler and will get a better result I'm sure...

    

6Back to top Go down    Re: Balancing act on Thu Apr 26, 2018 3:17 pm

Neal Cooper

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Shall I keep it red though? Thinking emerald green maybe... like the 70s airhead colour...

    

7Back to top Go down    Re: Balancing act on Thu Apr 26, 2018 3:21 pm

Neal Cooper

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BMW Nürburggrün Metallic

    

8Back to top Go down    Re: Balancing act on Thu Apr 26, 2018 6:12 pm

MartinW

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You might get the dent to pop with the hot air gun dry ice method. Metal has a memory so with the heating and rapid cooling it is sometimes possible to pop it or at least reduce it's size.
Regards Martin.


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K75s Hybrid
    

9Back to top Go down    Re: Balancing act on Thu Apr 26, 2018 8:41 pm

RicK G

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That tank has had something heavy dropped on it and stretched the metal I don't think it will pop out. I think it would need more than Nellie the faith mechanic could even muster. Best bet Neal is fill it with what we colonials call bog.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

10Back to top Go down    Re: Balancing act on Thu Apr 26, 2018 8:53 pm

brickrider2

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With that relatively huge filler opening right beside the dent, I'd encourage you to attack the problem with panel beater's tools and see what you can do.  Filling a divot that big with putty can't be a good thing. What's to lose by working the dent with tools?  Can you make it worse?

    

11Back to top Go down    Re: Balancing act on Thu Apr 26, 2018 9:08 pm

Dai

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I'm with that idea. With the right tools it may be possible to tease out most of the dent.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

12Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 12:33 am

duck

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@MartinW wrote:You might get the dent to pop with the hot air gun dry ice method. Metal has a memory so with the heating and rapid cooling it is sometimes possible to pop it or at least reduce it's size.
Regards Martin.

This doesn't always work even on small dents.  My experience doing this on K bikes is that it worked pretty well on one tank and not at all on another.

The dent in question is too far gone for that but on smaller dents


 it is always worth a try given the cost. (Or lack thereof.)


__________________________________________________
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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

13Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 12:37 am

duck

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@brickrider2 wrote:With that relatively huge filler opening right beside the dent, I'd encourage you to attack the problem with panel beater's tools and see what you can do.  Filling a divot that big with putty can't be a good thing. What's to lose by working the dent with tools?  Can you make it worse?

Don't know if you're aware of it but K tanks are double-walled so pounding it out from the inside is not an option.

That's a pretty nasty dent.  I'd look for another tank if it were my project.


__________________________________________________
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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

14Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 12:51 am

brickrider2

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Nope.  Never heard that before.  Why would BMW make them double walled?  On a summer's day, the exterior temperature of the tank sure wouldn't suggest it was for rider comfort.

    

15Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 12:57 am

RicK G

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I've cut two of them up and never found a double wall. The Aluminium is very high tensile and can distort easily if welding in the more open areas.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

16Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 1:30 am

duck

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@RicK G wrote:I've cut two of them up and never found a double wall. The Aluminium is very high tensile and can distort easily if welding in the more open areas.

Hmmm.... that's interesting. Never cut one up myself but I'd been told that.  Perhaps it's an urban legend.

I've got a couple of leakers that I plan to recycle in the near future. Think I'll get my grinder out first and do some 'splorin.


__________________________________________________
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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

17Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 3:55 am

Gaz

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Post number 7 of this thread had pictures of the inside of a fuel tank with it cut open - but I can't see them anymore.

Does anyone see the photos?


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Gaz
95 K1100LT 0232224; 90 K75 6427509; 87 R80G/S PD 6292136
    

18Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 6:34 am

K75cster

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Nope no photo's at all.. I used the skateboard and a block of wood to bring the gearbox into the clutch housing.
I'd just use a Jimmy bar the hooked end to tap away at that dent, in a couple of days she'd be back where you'd want it to then skim it with putty.


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

19Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 8:19 am

robmack

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@Gaz wrote:Post number 7 of this thread had pictures of the inside of a fuel tank with it cut open - but I can't see them anymore.

Does anyone see the photos?
https://photos.app.goo.gl/HMKDpPQGSXt5Cnjb8
https://photos.app.goo.gl/HMKDpPQGSXt5Cnjb8


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Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

20Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 8:34 am

RicK G

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@Gaz wrote:Post number 7 of this thread had pictures of the inside of a fuel tank with it cut open - but I can't see them anymore.

Does anyone see the photos?
Hey Gaz don't want you to choke on your dinner but can you imagine me sitting on the floor with the gearbox between my legs ready to put it in.
I think I have a copy of those pics somewhere. I shall search. My computer isn't as messy as the Kave but.
I'm gettin quicker, think these are the ones you were thinking of.



__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

21Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 10:42 am

Point-Seven-five

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Your dent appears to be in the rear portion of the tank.  I had a tank with the dent on the corner just to the right of yours.  By removing the connector plate on the bottom of the tank it is possible to to tap out the dent with a piece of dowel and a light hammer.  You have to get around the lines in there, but it can be done.  Should be easy to get it pushed out to where it will take less than 1/16" of filler to finish the repair. 

If the mount for the tank vent is in the way, you may have to get something behind the mount to lever the dent out.  In that case I would go for maximum pushout and then tap the surface into position from the outside.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

22Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 6:16 pm

Dai

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Find yourself a YouTube video or a well-written explanation of dent removal/panel beating before you go anywhere near it with tools. The obvious starting point is the deepest part of the dent, but it's also the wrong place. The metal there has thinned out (stretched); you start at the outside edges of the dent and gently work inwards. What you are doing is restoring the original thickness of the ally as you ease the dent out. Also; working through the fuel level sensor hole would be the preferable way to do it. Lay the tank upside-down on (preferably) a sandbag or a thick pile of towels - do not use a flat surface because you are trying to restore a curved surface.

It's not easy, nor is it quick.  You are going to need to make a pact with the Gods of Patience. I've done a few and found out why panel-beaters are paid a fortune.

But it's oddly satisfying to see the dent start to come out Very Happy, even if invariably the likes of you and I are always going to need to finish off with filler.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

23Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 8:04 pm

Neal Cooper

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All very interesting reading! When the tank fell off a wall bracket a few years ago I knew it was pretty knackered to use a Britishism... 
My tank doesn't have the panel in the bottom - it's a solid piece and so that option seems out. Does that sound plausible? Most of the tanks on ebay have the underside panel. Fuel pump wires go through a hole on left underside on this tank. 
Will report on progress with this mega ding...

    

24Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 8:04 pm

Neal Cooper

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All very interesting reading! When the tank fell off a wall bracket a few years ago I knew it was pretty knackered to use a Britishism... 
My tank doesn't have the panel in the bottom - it's a solid piece and so that option seems out. Does that sound plausible? Most of the tanks on ebay have the underside panel. Fuel pump wires go through a hole on left underside on this tank. 
Will report on progress with this mega ding...

    

25Back to top Go down    Re: Balancing act on Fri Apr 27, 2018 8:49 pm

duck

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Sounds like you have an 83-85 tank.


__________________________________________________
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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

26Back to top Go down    Re: Balancing act on Sat Apr 28, 2018 9:17 am

Neal Cooper

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Yep! Bike first registered in '84.

    

27Back to top Go down    Re: Balancing act on Sat Apr 28, 2018 8:36 pm

Dai

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Ah - now you're into specialist tool territory. It will probably be cheaper to source a new fuel tank, even at James Sherlock's prices. Talk to Motorworks and see what they've got.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

28Back to top Go down    Re: Balancing act on Sat Apr 28, 2018 9:42 pm

Point-Seven-five

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Can you reach through the filler opening and feel the dent with your fingertips?  If so, it may be possible to push out the dent with a lever.  I have seen guys who do paintless dent repair use them.  They have assortments of various shapes and lengths.   For your tank I would guess that one end will have a goose neck in it with a rounded tip.  The other end should have a tee handle welded on.  Overall length should be around 15-16 inches. 

The idea is to insert the lever's bent end through the filler, The goose neck will allow it to bear perpendicularly on the underside of the dent.  Put a thick layer of towels on the top of the tank for the lever to bear against and use the tee handle to work the lever against the dent.  As mentioned above work from the edge and be patient.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

29Back to top Go down    Re: Balancing act on Sun Apr 29, 2018 5:39 am

Neal Cooper

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I did research such tools a couple of weeks ago. Maybe one of these would do it. The tool in the middle has a likely looking angle...

https://www.ebay.co.uk/i/122990054215?rt=nc&_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20160908110712%26meid%3D1c16e81e96de411789c0dbe20ee716c0%26pid%3D100677%26rk%3D11%26rkt%3D30%26sd%3D253004474912%26itm%3D122990054215

Second hand tank maybe best option as a good set of these tools is fairly pricey - but could become a new skill...

I even tried to 'make' such a tool with an old paint roller holder but metal was too soft and it bent rather than the dented tank metal  Laughing Towels were used I recall -handy for mopping sweating brow after the wasted effort.
Neal

    

30Back to top Go down    Re: Balancing act on Sun Apr 29, 2018 6:09 am

charlie99

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perhaps a modified crowbar  could help ...just thinking aloud .as there are many things that could be done   and not depending on specialist tools ..hehe


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

31Back to top Go down    Re: Balancing act on Sun Apr 29, 2018 9:04 am

Point-Seven-five

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Charlie, the crowbar idea is brilliant.  The shape is almost exactly what I was thinking of.  Possibly with a bit of split rubber hose to cushion the tip and help it to not slip out of position.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

32Back to top Go down    Re: Balancing act on Sun Apr 29, 2018 9:24 am

RicK G

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You'll find plenty of split rubber hoses on a K100 Very Happy


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

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