Question about 2003 BMW R 1100 S Boxercup Prep

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Exhaust pop

Hi- I tried searcing this forum for help because you may have addressed this issue in the past but came up empty. My bike is a r 1100 s and has served me well in the past year or so. A second or so after I shut the motor off, or if I let off the throttle quickly when coming to a stop, there's a single POP coming from the muffler. Sometimes it's kinda loud, sometimes a soft POOF. This has happened since I bought the bike. I'm thinking unburned fuel igniting in the exhaust is causing this, and I've been told it could be too-lean or too-rich mixtire, too cold plug, too hot plug, etc. I'm not comfortable messing with the mixture so I try to ease off the throttle slowly when stopping, but I cant make the problem go away when shutting the motor off. Just looking for more opinions.

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If you are like me and not comfortable mucking about with your fuel mixture or carb settings, do what I do.....take the bike to your local shop and have them look at it.

Posted on Nov 20, 2008

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1 Answer

What will cause bluing on front exhaust pipe on 2003 yamaha v-star 1100


Ronald, All stock single wall pipes will blue some time or another. A big cause of Bluing is a badly tuned bike, burning rich or lean putting more heat into pipe.
There are polishes available to remove the Bluing, and some people on forums, they suggest to remove and with high heat paint, put several coats inside of chrome pipes.
Check the attached links,instruction and guides, Good luck
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May 06, 2016 | 2003 Yamaha V Star 1100 Classic

1 Answer

From cold start bike runs badly and backfires through throttle bodies. After 30seconds from start up bike runs fine.


Hi, Gerad and the usual suspects are:
1. A severely drained battery.
2. 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.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
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Feb 07, 2016 | Yamaha TDM 900 Motorcycles

1 Answer

Its making a poping noise out the exhaust and it cuts back when i give it gas


Hi, Anonymous popping or backfire on deceleration is usually caused by a lean fuel condition or an air leak in the exhaust system and is generally located where black carbon soot is seen as a flashing build up from any joint connection. This condition can easily be remedied by removing and cleaning both joint pieces and reassembling with high temp silicone and torquing the exhaust clamp to the proper spec. Coughing is usually caused by an air leak in the intake system and will generally have the same telltale signs of location by a wet or damp buildup of oil/gas seepage at the intake manifold to cylinder head or carburetor connection and in rare instances a worn throttle plate shaft and or seals. Spitting is usually caused by a faulty accelerator pump and or nozzle, or the float bowl needle and seat leaking and overflowing through the main jet mixing well nozzle, or the air-fuel mixture screw is adjusted too lean. For more information about your issue and valuable "FREE" downloads that you need please click on the links below. Good luck and have a nice day. Star 1100 popping noise
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Apr 10, 2014 | 2007 Yamaha V Star 1100 Classic

1 Answer

My ducati multistrada 1100s wont start it goes through about 5 cycles before starting


Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, 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.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Security alarm needs a reset.
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
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Nov 03, 2012 | 2008 Ducati Multistrada 1100

1 Answer

2005 V-Star 1100 flooded condition. Changed plugs...same result. Removed and cleaned carbs and set the floats a few times. Each time the bike stareted and ran mint at lower engine RPM. The problem is it...


Hi, Anonymous the following applies to carbureted also fuel injected models and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Water or dirt in the fuel system, carburetor or filter.
11. Restricted, blocked or kinked fuel line.
12. Fuel tank empty.
13. The gas cap is not venting properly or fuel tank venting system blocked.
14. A failed fuel pump, pressure regulator and or fuel injectors.
15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
16. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you need please click on the links below. Good luck and have a nice day.
http://www.starbikeforums.com/forums/18-engine-work/8857-2005-v-star-1100-wont-rev-past-1-3-throttle.html
https://yamahaclub.com/forums/topic/15251-idles-fine-but-dies-upon-throttle
http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
OEM parts for Yamaha
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Oct 10, 2012 | 2002 Yamaha V Star 1100 Classic

1 Answer

Back fire problem


Hi, Regino and the usual suspects are:
1. A severely drained battery.
2. 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.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
http://www.ducatimonster.org/forums/tech/203466-monster-1100-evo-engine-vibration.html
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Nov 10, 2011 | 2011 Ducati Monster 1100 Evo

1 Answer

Just picked up a 2006 v-star 1100 custom. when the engine is warmed up i am hearing a ticking coming from the front cylinder. the bike has been sitting for awhile and only has 5800 km(3625 miles) on it....


The ticking could be excessive valve clearance but since it's popping on deceleration, it's possible what you hear is an exhaust leak. Check the pipe connections at the cylinder. This is a very common issue - especially because the front pipe has to be removed to change the oil filter, so if the problem began after service it's entirely possible they re-used the exhuast gasket.

I hope this helps.

Sep 12, 2011 | 2006 Yamaha V Star 1100 Classic

2 Answers

I have a 1998 shadow spirit 1100 i replaced the choke cable on it now it seems not to be running correct i hear a slight backfire from the exhaust on the back cylinder i checked the adjustment twice &...


The popping or backfiring is caused by air leaks in the exhaust system and unburned fuel igniting. Try replacing the copper crush o-rings between the head pipe and the head. Seal the air leak and the popping should stop. You can have an exhaust leak start any time any where. Many times exhaust systems are replaced and the gaskets are not replaced causing the popping issues.

Feb 04, 2011 | Honda VT 1100 C Motorcycles

1 Answer

Dos,nt take gas bake firing


I have the same bike with 8000 miles on it., Alot of bikes backfire especially these with the emissions package. I'm a smog tech and what backfiring means is detanation from a lean condition. The cylinder gets hot on decel and you get the pop. You could go the sabrehood forums and register and talk to people about these bikes.

What I did was put a k/n filter. put a stage 2 jet kit and a cobra slash cut exhaust and this seemed to reduce the amount of backfireing alot.
Bikes loud and maybe a little quietier exhaust would of been better but for now bike runs alot better.
Hope this helps

Dec 22, 2009 | 2004 Honda VT 1100 C2 Shadow Sabre

1 Answer

2003 boxercup replica


Hi, Ninnersrule for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. For more information about your issue and free downloads that you need please visit the websites below. Good luck and have a nice day.
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Jan 21, 2009 | 2003 BMW R 1100 S Boxercup Prep

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