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K100-forum.com » Technical, repair and troubleshooting » Engine and transmission » Opened up the exhaust and am getting some backfire

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shalbleib

shalbleib
New member
New member
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!

Opened up the exhaust and am getting some backfire Mc_k100Opened up the exhaust and am getting some backfire DSC01148

    

charlie99

charlie99
VIP
VIP
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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'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 ..
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1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

shalbleib

shalbleib
New member
New member
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

klompy the grey brick
VIP
VIP
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 Opened up the exhaust and am getting some backfire 2854237993
"Grace" 1984 K100RS Silver VIN 0019026 Mitt eine Staintune Zorst.
"Olivia" 1997 K1100LT 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)

Opened up the exhaust and am getting some backfire Au-log10


    

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

duck
Life time member
Life time member
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.


__________________________________________________
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
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Post moved to Engine & Transmission Technical Section, Repair & Troubleshooting.


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"How many cars did we pass today?" "ALL of them."
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

Rick G

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


__________________________________________________
"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
    

MikeP

MikeP
Life time member
Life time member
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.


__________________________________________________
1992 K1
1993 K1100R (used to be an LT)
    

brianpen

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

    

shalbleib

shalbleib
New member
New member
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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