Question about 2006 Yamaha V Star 1100 Custom

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I have a 2004 vstar 1100 classic that backfires on the front cylinder during idle only. What is causing this? i have rejet the carbs and it still has the issue. everywhere i have looked says that it is a lean condition, but i am not sure if i need fatter jets or not.

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What you need to is pull a plug and see what it looks like this will tell what you need to do to your jetting. yes this could be a lean backfire it could also be fat. if your plugs are looking white your lean if they are back you fat. you need to get the bike fat before you lean it out. the first set in jetting is to get your bike to pull hard under full accl. once you have that then you can work out your idle. don't forget about your air/fuel screw. the air/fuel IS a part of everything from idle to full wide open. do you have pipes and a air filter? the best people to call is factory pro. they make jet kits and i have learned a lot from those kats.they know there poop and can get you set up right. remember to set your rear cyl just a little fatter then the front it will help with cooling. If you need more help please feel free to call me at the shop C.C. Motorsports (361) 885-7787
Good luck
Mark

Posted on Apr 29, 2010

  • scline01 May 03, 2011

    This can also be caused by air leaking into your exhaust where your fittings aren't snug. Make sure you've torqued down the exhaust pipes. If air (oxygen) gets into your exhaust, any un-fired gasoline will reignite and cause the backfire. Been there, done that...

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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
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http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
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http://www.starmotorcycles.com/assets/service/manuals/2000/LIT-11626-13-36_96.pdf

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1 Answer

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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.
Combustion issues in the front cylinder in 1100 Star Tech Forum
http://www.starbikeforums.com/forums/49-v-star/28593-vstar-1100-backfiring-one-cylinder.html
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

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1 Answer

Hello please advice as to why th ebike will just idle and with choke on full but just off if choke is off or acceleratoer is turned on high i have 2004 vstar 1100 with only 420kms


sounds like the carbs are gummed up since its a low milage bike. either open the carbs and clean them or use a fuel system cleaner and hope for the best.

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1 Answer

Yamaha vstar 1100 back fireing


Re-jetting the carbs may be needed.
Imbalance of air/gas ratio will cause backfiring among many other things. :)

Other considerations:
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.

Good luck!
Hope this helps.

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As far as the backfire - this might be either from the carb issue or it could be related to that rattle you mentioned - you could have a loose connection at or near the head - this can **** air and cause a backfire.

I hope this helped!

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