BMW K bikes (Bricks)

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1Back to top Go down    Just A question on Tue Nov 06, 2018 6:58 pm

yamaguzzi

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How often or how many miles can you go without replacing the fuel filter? I put all new stuff in the tank and cleaned the tank with acid to like new condition 6000 miles ago (about a year and a half ago) and wonering if it's time to change the filter.There is nothing wrong with the way the bike runs for the most part but the other day I really got on it and at about 5500 rpm it started to act funny. Slowed down and everything was good again so I'm thinking it might be that time.Anyone?


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://facebkfugitive.blogspot.com/
    

2Back to top Go down    Re: Just A question on Tue Nov 06, 2018 7:17 pm

Point-Seven-five

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6000 miles is about 120 gallons of gas.

When you consider that a lot of automobiles can go 150,000+ miles which uses about 5,000 gallons running the same gas through similar filters you have to wonder how often you really need to change that filter.


__________________________________________________
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
    

3Back to top Go down    Re: Just A question on Tue Nov 06, 2018 7:21 pm

yamaguzzi

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That's a good point So I guess I should look at something else as the cause of crappy high speed performance like corrosion on some connection or leaking vacuum lines


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://facebkfugitive.blogspot.com/
    

4Back to top Go down    Re: Just A question on Tue Nov 06, 2018 7:31 pm

Arlina

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I replace whenever neccesary, most when I just buy another K.


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K1100RS/LT - R1200RT - K100LT 16v - R1100RS (RIP) - Cagiva SST 350 Ala Verde
    

5Back to top Go down    Re: Just A question on Tue Nov 06, 2018 7:34 pm

Dai

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I last replaced mine about 60,000 miles ago, just when I bought the bike.


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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)
    

6Back to top Go down    Re: Just A question on Tue Nov 06, 2018 8:06 pm

yamaguzzi

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Thanks guys . Now I am pointed in the right direction and I will start going over the hoses and connections.


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://facebkfugitive.blogspot.com/
    

7Back to top Go down    Re: Just A question on Tue Nov 06, 2018 9:39 pm

duck

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Easy test. Pull the fuel filter and try to blow through it. It should be pretty easy.

Napa 3032 filter is readily available in the US and only about $5.

Miles/gallons aren't the only thing that mess up fuel filters. If a decent amount of water sits in a fuel filter it can swell the fibers and restrict flow.


__________________________________________________
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
    

8Back to top Go down    Re: Just A question on Wed Nov 07, 2018 3:04 am

Arlina

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E5 and E10 is hydroscopic, means it attracts water, like brakefluid.
And that crap gets old much faster than the old fuel, can make a mess in the filter.

Last year in Germany, I was able to take Supreme fuel 102, made a smooth racing bike of the old K Smile


__________________________________________________
K1100RS/LT - R1200RT - K100LT 16v - R1100RS (RIP) - Cagiva SST 350 Ala Verde
    

9Back to top Go down    Re: Just A question on Wed Nov 07, 2018 9:00 am

Point-Seven-five

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Have you checked the valve clearance? Tight valves can make it break up. A bad plug or plug wire can cause problems a well. How is the air filter?


__________________________________________________
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
    

10Back to top Go down    Re: Just A question on Wed Nov 07, 2018 11:05 am

Two Wheels Better

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@Arlina wrote:E5 and E10 is hydroscopic, means it attracts water, like brakefluid.
And that crap gets old much faster than the old fuel, can make a mess in the filter.
Smile
It's actually Hygroscopic, the ability of a chemical compound to absorb or attract water.

Hydroscope is a tool, similar to a telescope built for observing things underwater.


__________________________________________________
1987 K100RS, '93 K11/K12 hybrid 'Big Block', '09 K1300GT, '07 K1200R, '04 R1150RT, '95 R100 Mystic, '77 R75/7.
Have we accomplished half of what we dreamt we would? There may still be time.
    

11Back to top Go down    Re: Just A question on Wed Nov 07, 2018 12:52 pm

Arlina

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Thanks TWB, mistype in the morning Very Happy


__________________________________________________
K1100RS/LT - R1200RT - K100LT 16v - R1100RS (RIP) - Cagiva SST 350 Ala Verde
    

12Back to top Go down    Re: Just A question on Wed Nov 07, 2018 12:56 pm

Two Wheels Better

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@Arlina wrote:Thanks TWB, mistype in the morning Very Happy
No worries, Arlina. That's what comes from having a schoolteacher for a father.
study scratch


__________________________________________________
1987 K100RS, '93 K11/K12 hybrid 'Big Block', '09 K1300GT, '07 K1200R, '04 R1150RT, '95 R100 Mystic, '77 R75/7.
Have we accomplished half of what we dreamt we would? There may still be time.
    

13Back to top Go down    Re: Just A question on Wed Nov 07, 2018 1:05 pm

Laitch

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@Arlina wrote:E5 and E10 is hydroscopic, means it attracts water, like brakefluid.
@Two Wheels Better wrote:It's actually Hygroscopic, the ability of a chemical compound to absorb or attract water.
Both E10 gasohol and brake fluid are also hydrophilic. If hydro is one of your favorite prefixes, there you go.
cheers
That is why ethanol both contributes to octane level in fresh fuel but also creates starting problems in stored fuel. It's also why brakes fade when using old brake fluid under hard usage.


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1995 K75T 68,000 miles
    

14Back to top Go down    Re: Just A question on Wed Nov 07, 2018 2:57 pm

duck

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Water causes much different problems in gas vs. brake fluid. The problem with old brake fluid that's absorbed water is that water is more compressible than brake fluid which is why brakes with old fluid get mushy.

Water in gas causes different problems.


__________________________________________________
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
    

15Back to top Go down    Re: Just A question on Wed Nov 07, 2018 3:01 pm

Laitch

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@duck wrote:Water in gas causes different problems.
No kidding? Laughing


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1995 K75T 68,000 miles
    

16Back to top Go down    Re: Just A question on Wed Nov 07, 2018 3:12 pm

brickrider2

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Water is compressible? I've never heard that before.
I thought the problem with water in brake fluid is it's tendency to boil at high temperatures, passing to a gas state, which would compress.


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1996 K1100LT
    

17Back to top Go down    Re: Just A question on Wed Nov 07, 2018 4:03 pm

duck

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Yes, water is more compressible than brake fluid. Brakes with water in them will be mushy at room temperature.

And the boiling point is an issue as well.

Rust caused by water in brake components can also be an issue.


__________________________________________________
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
    

18Back to top Go down    Re: Just A question on Wed Nov 07, 2018 8:41 pm

Laitch

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What about verdigris? Smile


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1995 K75T 68,000 miles
    

19Back to top Go down    Re: Just A question on Fri Nov 09, 2018 4:32 pm

ERasberg

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@brickrider2 wrote:Water is compressible? I've never heard that before.
I thought the problem with water in brake fluid is it's tendency to boil at high temperatures, passing to a gas state, which would compress.

Yes this is correct.
Though it is true that water is not 100% in-compressible (nothing is), water in liquid state is still considered high in density and not necessarily more compressible than brake fluid.

The 4 critical purposes a brake fluid has to fulfil :
1. Maintain a high boiling point
2. Maintain a specific viscosity range
3. Prevent corrosion
4. Maintain low compressibility

In addition, the brake fluid must maintain [pretty much] the same compressibility across a wide temperature range, say from freezing to way above boiling temperatures.

Water obviously does not do that, as it changes states from solid via liquid to gas and therefore also moves the values of both compressibilty and viscosity in the process.

Mixing just a tiny bit of water into the brake fluid will hence impact all of the above parameters preventing the brake fluid from fulfilling its purpose.
3% water is apparently the critical limit for brake fluid.

Best regards,
Einar


__________________________________________________
Present
1988 K100 RS SE - VIN# 0146971K100RS - 105,000 km
1998 R1200C
1971 R75/5

Previous
1999 Virago XV125
1981 R65
    

20Back to top Go down    Re: Just A question on Fri Nov 09, 2018 5:50 pm

92KK 84WW Olaf

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Its not difficult in mountain, very hot or racingconditions to get brakes extremely hot. Brake fluid will have a decent boiling temperature, water does not and will become steam which will of course be compressible and result in brake failure. It does not have to reach 100c for these things to happen,


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 83,050 miles
    

21Back to top Go down    Re: Just A question on Fri Nov 09, 2018 7:46 pm

ERasberg

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Regarding the original question, when to change fuel filter I would day unless you encounter regularly low quality fuel the general recommendation is to change every 40 000 km.


__________________________________________________
Present
1988 K100 RS SE - VIN# 0146971K100RS - 105,000 km
1998 R1200C
1971 R75/5

Previous
1999 Virago XV125
1981 R65
    

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