BMW K bikes (Bricks)

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shalbleib

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I customized a 87 K100, and opened the exhaust up a bit. It's backfiring a bit on decel and was wondering if there's some adjusting that can be done to make it run a little smoother. Any suggestions would be greatly appreciated!

    

charlie99

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reseal the tb (throttle body ) rubbers they often let a little air in.
since doing that myself ...almost all backfiring has disappeared completely


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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
    

shalbleib

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@charlie99 wrote:reseal the tb (throttle body ) rubbers they often let a little air in.
since doing that myself ...almost all backfiring has disappeared completely
but it only started happening after I modified the exhaust. no backfires w/ stock exhaust. seems like I need to adjust the air/fuel mixture. someone suggested resetting the computer but I haven't been able to find any info on that.

    

klompy the grey brick

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My stock standard 84 RS does the same with the staintune Zorst I guess that is the price you pay for performance...although its not too intrusive and burbles more than actually flaming farting...etc


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KKlompy
1984 K100RS Silver VIN 0019026 Mitt eine Staintune Zorst.
1997 K110LT Dark Grey VIN WB1052600W0237453.

Chassis number0019026
Vehicle code0503
SeriesK589
ModelK 100 RS 83 (0502 ( 0503 )
Body typeK 100 RS 83 (0502
Catalog modelECE
Production date1984 / 07
Engine0513)




    

K-BIKE


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Post your questions in the technical section, not all of the gurus read the new members section and you may miss out on their advice.
Regards,
K-BIKE

    

duck

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There's no "resetting" of the ICU or L-Jetronic.

Try less engine braking to reduce backfiring.

Check the TPS setting.

Check the valves.

Install new spark plugs - NGK D7EA. (But not when you're messing with the valves as carbon deposits can fall into the valves if you do both at the same time.)

Sync the throttle bodies.


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Current stable:
86 Custom K100 (K75C fairing, K75 Belly pan, Ceramic chromed engine covers, 32/10 final drive)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
93 K1100RS
94 K1100RS
93 K1100LT
91 K1
93 K75S
http://www.ClassicKBikes.com
    

Two Wheels Better

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Post moved to Engine & Transmission Technical Section, Repair & Troubleshooting.


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'77 R75/7-1000cc, '87 K100RS, '93 K11/K12 Big Block, '94 R100R Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R & '07 K1200R
    

RicK G

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I would be checking the TPS first but just leaking exhaust crush washers at the head can cause backfire.


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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
    

MikeP

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I was going to suggest checking for leaks too. In my experience, backfiring and popping on the over-run is usually a poor seal somewhere allowing back pressure to pull in cool air.


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1992 K1
1993 K1100R (used to be an LT)
    

brianpen

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Nice looking mod. Any write up on your project forthcoming? I'm curious what guages you have, or not.

    

shalbleib

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@brianpen wrote:Nice looking mod. Any write up on your project forthcoming? I'm curious what guages you have, or not.
there's a write up here:
http://www.pipeburn.com/home/2012/10/27/scott-halbleibs-bmw-k100rt-number-3.html

no exhaust at the time of this - fyi. oh and I'm not using any gauges

    

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