Question about 1993 BMW K 1

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Poping What would cause a bmw k1 to pop a lot? It is a lot like small backfires. Air filter is fine, fuel is fresh (if that makes a difference), plugs are good and I get a pretty blue spark when I take the plugs out. Timing?

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Have you replaced the muffler or the exhaust system? This will cause it to backfire thru the rear pipe due to opening up the breathing. If not, it may be caused due to one of the injectors staying open slightly and causing fuel to leak into he combustion chamber & firing when it is not suppose to, on the exhaust cycle. This will not hurt anything just noisy.

Posted on Apr 11, 2009

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Does this happen when closing the throttle? Under hard accelleration? All the time? Could be 'decelleration popping' as they jetted bikes pretty lean back then. It is common. Honda XL's and XR's came with a wire mesh screen in the airfilter to keep sparks from this lighting the airfilter on fire. If it only happens with closed or partly closed throttle, it is no big deal.

Posted on Nov 20, 2008

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1 Answer

I have a 1973 harley davidson sportster xlh 1000 with drag pipes i just bought it, but it ran great it sat for 3 months now it pops and backfires and is have a oily mist from the air cleaner and i dont...


popping and backfiring sounds like a lean fuel mixture, caused by the wonderful gas we are getting these days. try draining fuel system, put in fresh fuel. the oily substance is coming from the crankcase vents located within the air filter cavity, a lot of bikes do that, ck. oil level not over full.

Mar 31, 2013 | 1979 Harley Davidson XLH 1000 Sportster

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Need fuel filter part number and/or aftermarket brand


There are so many different things that can make the bike do that. The fuel pump could be going out(VERY COMMON) or you could have a dirty AIR FILTER causing the restriction. if the fuel filter was the problem you would more than likely have some backfiring or popping coming from the engine. Need more info to diagnose it. However if you want any parts - Harley Davidson and American sportbikes are a few of the only places to get em.

Dec 06, 2012 | 2000 Buell X1 lightning

1 Answer

Drained old gas put in new new now its poping from exhust


Crackling and backfire is nearly always lean on fuel condition...
open your air fuel mix screw tiny amount at a time and test to see if helping this should clear up the popping..
Please note if you need to open the air fuel mix screw more than 3 full turns from fully closed then the easiest solution is leave the air fuel screw at 2 turns out from closed and increase the size of your pilot jet by one or two sizes.. they very cheap to buy few dollars each.
I would suggest if your only popping and crackling a little then small adjustment on the air fuel mix screw will cure it for sure
Being YZ I find an occasional pop or backfire when de acelorating is exactly how they should be if you don't get a pop or crackle every now and again then chances are it running to rich.
but if it is regular occurance then definitely needs fine tuning or larger pilot jet installed
good luck regards Jamie

Sep 09, 2011 | 2003 Yamaha YZ 450 F

1 Answer

Popping and backfires when decellerating


The primary cause for backfiring on deceleration is an air leak - if the baffles have been removed or modified or if the gaskets in the exhaust tract are not sealing properly, fresh air can be introduced into the exhaust stream causing a pop or backfire. Check your exhaust system - especially if you have recently had an oil change, since the pipe has to be removed to change the oil filter on this model.

Jun 22, 2011 | 2005 Yamaha V Star 1100 Silverado

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My 02 FLHRI was running fine when I parked it for a couple hours. When I tried to start it, it ran for a min. started coughing and popping then shut down. It would not restart just pop and backfire. Could...


Before I went to the expense of doing a fuel pump I would empty the gas tank and change the gas filter and put in fresh gas. Water or dirt in your lines can cause this problem.

Jun 06, 2011 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

Bandit k4 will idle but not rev out, pops and back fires


Pops and backfire on deceleration would normally point toward lean on fuel has it got after market exhaust or air filter ? these both will cause it to want/need more fuel
may need to fine tune fuel air mix

May 22, 2011 | Suzuki XP 65 R Motorcycles

1 Answer

My 97 gsxr 750 susiki is now poping and back firing what would cause this


Backfiring can occur from many things. First thing I would do is have the timing checked. If the timing hasn't been checked in a while and you ride regularly, it may just be that time. If the timing is fine, you may be running either rich or lean. If you are running lean, it could be from a semi-clogged fuel filter. If the fuel filter is fine, you might just have too much air in comparison to the amount of fuel being delivered. In that case it isn't a serious problem. If it bothers you though, you could install a digital fuel modulator to increase the amount of fuel that is delivered.

Another problem may reside with the intake valves

Apr 07, 2010 | 1996 Suzuki GSX-R 750 T

2 Answers

I too have a 1990 K1 & it won't start. Did you solve yours?


hi buddy then fan will kick in and the oil temp will be high due to you not riding fast enough to let air pass the radiator and oil cooler t cool the liquid but bikes are built for this budd you have nothing to worrie about

Sep 02, 2009 | 2008 BMW K 1200 R

1 Answer

Rapid popping/crackling noise in xr80


a four stroke will pop and backfire under decelleration when it is lean, or not enough fuel. (Jetting too small in the carburator) But, look at the spark plug for color, white is too lean, black is too rich, and chocolate is just right. Make sure the air filter is good and clean. And lastly... have the valves been adjusted?

Jul 30, 2009 | 2003 Honda XR 125 L

1 Answer

Riding the bike it intermediatly looses power, does not backfire,


Hi, Philqsa and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intake air leak.
8. Water, dirt, or rust in the fuel system, carburetor and/or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose, dirty, or corroded ignition module connector at crankcase.
13. Faulty MAP, CKP, O2, and/or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damaged intake or exhaust valve.
For more information about your issue, please visit the websites below. Good luck and have nice a day.
troubleshooting starting
K75 Throttle Response Hesitation Off Idle BMW K75 K100 K1
http://www.k100.biz/pdf/OFF/K100_K75_2V_eng.pdf
BMW Motorcycle Parts Fiche OEM BMW Motorcycle Parts online 1970 present BMW
http://www.bmw-motorrad.com/us/en/index.html?content=http://www.bmw-motorrad.com/us/en/services/manuals/manuals_main.html¬rack=1

Apr 23, 2009 | 1991 BMW K 100 LT

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