BMW K bikes (Bricks)

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1Back to top Go down   Injector Flow Rates Empty Injector Flow Rates Tue May 29, 2018 11:27 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Noticed a comment recently about injectors wearing and running more fuel through them.

Is this an actual situation?  Has anyone had their injectors cleaned and tested with flow rates measured?  I have had two high mileage K bikes with plugs that read on the slightly rich side; that is with blackish insulators and electrodes. 

My K75S with only 40k miles has nice tan insulator noses.  The other two are in good tune with clean air filters, run very well and get fuel efficiency similar to the lower mileage bike.  The only difference is the black color.

Would there be any benefit to replacing these injectors after 85k miles?  Or should I just ignore them.  One of the bikes is my K75RT that I use for horizon chasing.


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

2Back to top Go down   Injector Flow Rates Empty Re: Injector Flow Rates Tue May 29, 2018 1:27 pm

duck

duck
Life time member
Life time member
I've had many sets of FIs reconditioned. In the "before" reports not a single one of them has ever shown as putting out too much fuel, but often they put out a little less.

At 85K, if they hadn't been serviced before, I'd get them reconditioned. Worst case, it's good preventative maintenance.

I always do it for any K I buy, regardless of mileage. If they're high mileage then it makes sense. If they're low mileage then there's a good chance that the bike has sat for an extended period at some point in time so there's some varnish built up in them. Of all of the ones I've had done, they're never all been perfect prior to reconditioning.


__________________________________________________
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
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

3Back to top Go down   Injector Flow Rates Empty Re: Injector Flow Rates Tue May 29, 2018 5:22 pm

MartinW

MartinW
Life time member
Life time member
Gryph try cleaning your injectors and get your patterns checked. I had mine cleaned professionally twice over the years. But it wasn't until I did my own and got even patterns and flow rates  that I got rid of my sooty exhaust and backfiring.  Also check your mixture with the little  green button. A blockage or partial blockake in the fuel return line will cause rich running.
Regards Martin.


__________________________________________________
K75s Hybrid
    

4Back to top Go down   Injector Flow Rates Empty Re: Injector Flow Rates Tue May 29, 2018 8:27 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Both bikes have been run many thousands of miles with performance I cannot complain about.  The K75RT has over 28,000 miles that I put on it and has at least one bottle of Techron through it each year at the beginning of the season with another at mid season and when put away for the winter..  The K100RS has had 16,000 miles put on it with bi-monthly doses of Techron.  Fuel efficiency averages 45-48 mpg when commuting at 65-50 mph.  Idle is smooth and start button test is good.  As I mentioned, the plugs show a bit of black, and on acceleration, there sometimes is a tiny puff of black smoke.

I would expect that flow rates would be low in varnished injectors, but i would think that would yield a lean mixture which I am not experiencing.  I am just curious to know if the rifices open up with age and result in higher than specified flow


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down   Injector Flow Rates Empty Re: Injector Flow Rates Tue May 29, 2018 10:49 pm

Rick G

Rick G
admin
admin
I experienced a rich reading on plugs after using injectors that were rusted closed. I suspect that the rust is the reason for wear not normal use.
I had a Ford Fairlane with over 600,000km on it and the original injectors, which are the same injector but higher flow rate and it ran quite well with good economy.


__________________________________________________
"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 2004 K1200GT 1998 K1100 LT, 1986 K75 GS.
    

6Back to top Go down   Injector Flow Rates Empty Re: Injector Flow Rates Wed May 30, 2018 4:03 am

MartinW

MartinW
Life time member
Life time member
Gryph are you running a OEM return line? If not there is a possibility of the non OEM line kinking slightly or a lot. A restriction can cause smoking. With mine it was hard to determine on a visual inspection I had to get my hand in there to feel the slight kink. Is it possible the fuel cooler is causing a restriction?
Regards Martin.


__________________________________________________
K75s Hybrid
    

7Back to top Go down   Injector Flow Rates Empty Re: Injector Flow Rates Thu May 31, 2018 12:35 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Martin, non-OEM, but with enough extra length to allow easy bends and moving the tank.  The fuel cooler on the RT flows very freely as the internal cross section is approximately 1.5 sq.in.

I guess I will just ignore the plug readings and continue to ride without messing with the injectors.   I can't see sending them out and paying for service just to find out what they are flowing when both bikes are running so well.  I was hoping that someone else might have had theirs serviced and found that the flow rates had increased above specification with extended mileage.


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

8Back to top Go down   Injector Flow Rates Empty Re: Injector Flow Rates Thu May 31, 2018 6:04 pm

MartinW

MartinW
Life time member
Life time member
Gryph you can clean them yourself and test the patterns and flow rates without going to the extent I went to. There are heaps of methods on the net for the cleaning. And all you need to test the patterns is a soft drink (Soda) bottle. I bought a graduated vessel off a local home brew supply shop, to test the flow rates $10.00 Au. Probably a job for next winter, you just need to enjoy your bikes while you have the weather. First day on winter here 10C overnight 20C expected daytime.
Ride long and prosper regards Martin.


__________________________________________________
K75s Hybrid
    

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