Question about 2003 Yamaha V Star 1100 Classic

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Backfires on acceleration

I have a 2003 yamaha vstar 1100cc. I just had the carb rebuilt. It idles good but when accelerating it backfires. Does this mean it needs new plugs or what?

Posted by Anonymous on

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  • Yamaha Master
  • 43,785 Answers

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.
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.
http://www.starbikeforums.com/forums/49-v-star/28593-vstar-1100-backfiring-one-cylinder.html
Popping and backfiring in 02 Yamaha VStar 1100 Twin Forum Harley Davidson...
http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2000/LIT-11626-13-36_96.pdf

Posted on May 09, 2016

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Posted on Jan 02, 2017

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  • 9 Answers

SOURCE: 2005 yamaha yzf 250-unstable idle

I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

Posted on Mar 12, 2009

  • 298 Answers

SOURCE: have problems starting yamaha xvs 1100 dragstar

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
-levibit-

Posted on Mar 29, 2009

  • 298 Answers

SOURCE: engine idles fine, stalls soon as its given gas

Hi there!

Open up the carb and clean the jets with pressurized air. I also suspect water on the carburetor reservoir, before opening the carb, drain it first then run. Also, make sure the plugs are clean. Pull on the choke when twisting the accelerator, if it accelerates well, then warm the beast at normal temperature first before twisting the throttle hard again.

hope this helps-
levibit-

Posted on Mar 29, 2009

  • 2 Answers

SOURCE: vstar 650 loosing power and missing during acceleration

check your coils and wires to them had same proplem and found 1 of the grey wires to the coil was disconnected

Posted on May 18, 2009

SOURCE: my 1989 yfm 350 moto 4 starts but will not come

Recheck the float level, reblow the jets both primary and main.
Replace the spark plug and reset the air-mixture screw....2 and half turns to 3 outwards ..
after tightening it to the end take care not to over tighten ....to avoid damaging the tip of the screw.
Hope this helps!

Posted on Oct 11, 2009

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