Question about 1999 Yamaha XVS 1100 Dragstar
It backfires at low revs.
Posted by Anonymous on
Hi, Anonymous 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. 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 check for spark leakage in the dark.
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 click on the links below. Good luck and have a nice day.
New problem on old bike 02 Star 1100 Custom popping and backfires when at...
Exhaust popping backfire Yamaha Star Forum Yamaha XVS1100L Service Manual
OEM parts for Yamaha
YAMAHA XVS1100 Owner Manual
Posted on Nov 21, 2016
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Posted on Jan 02, 2017
all v twin engines are noisy, if you could totally silence the exhaust noise, you would be horrified how awful the motor sounds, it could probably do with the cam chain tensioner ADJUSTING. i wouldn't think it would need replacing. unfortunately the manual only recomends this being done by a qualified tech, i have a xvs 650 with same trouble. i would adjust myself if i could find out the correct tollerences.
Posted on Mar 27, 2009
Hi there fellow XVS dragstar owner!
I had the same problem before. It is usually caused by the wrong jets installed. have it Replaced with the standard jets that came with it... this will solve the problem on acceleration. Make sure the fuel and air mixture knob is set to 2.5 turns-out from full close. clean the spark plugs.. better, replace it with a new one to ensure clean burning of fuel. also, use unleaded gas. this burns better.
hope this helps
Posted on Mar 29, 2009
SOURCE: yamaha vstar 1100 back fireing
Re-jetting the carbs may be needed.
Imbalance of air/gas ratio will cause backfiring among many other things. :)
Have the timing and valves set.
After market pipes will also increase the Poping sound when you let off the throttle. (not really backfiring but annoying)
Removing and plugging the AIS system will stop most of this.
Hope this helps.
Posted on Jul 18, 2010
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