1994 Yamaha XV 535 Virago DX Logo

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Gary cekovich Posted on Apr 11, 2012

83 virago not running on rear cylinder getting fuel and spark

Bike runs on front cylinder only all electrical check out timing is good motor is rebuilt spark is good carbs are rebuilt and set to specs. The bike is pulling fuel in but will not fire it on rear cylinder and has great spark. also, have tried several tci units and different carbs they all do the same, stator is new pickup is good voltage reg is new and battery is new. I work on these all the time and have never come across a situation like this what would cause this.

5 Related Answers

tombones

  • 3567 Answers
  • Posted on Apr 11, 2009

SOURCE: bike only fires once

Okay, let's have a look at it. Say Ahaaa.
The probable cause of the problem is not the spark. Get a fresh set of Stock NGK spark plugs, ground the plus to the engine, and check each cylinder for spark as the starter button is pressed for 3 seconds or so. I will wager that the spark is present.

The likely problem is the fresh gas was put into a very rusty gas tank. Bits of rust now inhabit your carb and are having fun plugging up the carb. Look at the gas valve. With a little luck there is a small bowl behind the valve. Remove it and tell me what you see in the bowl.

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Anonymous

  • 408 Answers
  • Posted on Jun 09, 2009

SOURCE: Yamaha dt 175, voltage question. When idling, my

You need new regulator and new battery.The battery works as a filter as well.If it is in bad condition it does not filter anything and in high rpm the current is very high.

Anonymous

  • 311 Answers
  • Posted on Jul 06, 2009

SOURCE: 83 virago 750 under 3500 rpm runs bad. over 3500 runs good

hi,says here you had the carbs redone,it sounds to me like the carbs were not rebalanced after installation,if you do any work at all ocn carbs it is quite important that the carbs be properly rebalanced,it only takes very minor adjustments inside carbs(even a scratch on a jet)or different torque settings on screws etc will trow the balance out,if you get this done i think your problem will disappear..hope this helps

Anonymous

  • 484 Answers
  • Posted on Oct 28, 2009

SOURCE: 1994 fzr 500 rear barke light and turn signals not

Your relay is bad. It is right next to the fuse block.

i hope this helps you
-matthew

agent91

Ned White

  • 2100 Answers
  • Posted on Oct 11, 2010

SOURCE: I just replace a broken

I would squirt some fuel in the cylinder to see if it fires, then if it does, blame the jets in the carb being set wrong. Get some fresh gas, and a new plug if you have one. The carb settings might be fixed but still wrong. If they are adj, take them all the way in, then out 1 1/2 turns, this should get it running, if the jets are fixed on the inside, they might need some deep cleaning, did you make sure they were real clean??? Poke a wire through them and blow through them?? Check it out.

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No ignition in rear cylinder, but spark is normal

check for fuel to the rear cylinder. ( dirty carb)
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Front cylinder misfires

Replace the coil lead & plug cap

Ride safe
Bike-Doc
Feb 01, 2012 • Motorcycles
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I have a 2000 virago 250 ran perfect for the first year. Then lost power. you pull front plug wire off while running it dies instantly. pull rear wire off it still runs rough. if you leave wire close to...

Are you sure the rear cylinder has good compression? Did you check the two cylinders with a compression gage? The compression should be within 10% of each other. Check the ignition timing of the rear cylinder. I will bet the valves just need to be re-seated on the rear cylinder.
1helpful
2answers

Only running on rear cylinder.

Hello,
Your bike needs three thing to run.

  • Spark
  • Compression
  • Fuel

The first thing to check is the spark on the front cylinder. You should remove the front spark plug and then put it back in the plug wire. Make sure that the spark plug is grounded by placing the threaded portion on the cylinder head fins. Now you can crank the engine over and watch for spark. If it does not spark you have an ignition problem, replace the plug with a new one and try again.

The next step is to check the compression. You will need a compression tester with the proper adaptor to thread into the spark plug hole. Remove the rear spark plug wire. Once the compression tester is installed crank the motor over with the throttle all the way open. Your compression should read at least 150 psi. If the compression is very low you need to have the motor dissasembled for inspection.

The last and most common problem is the carburator. If the bike has been sitting the carburator can become gummed up and prevent fuel from getting to the cylinder. The only fix for this is to remove the carburator and clean or rebuild as needed. This is very detailed work and should be performed by a qualified technician.

Thanks and I hope that this helps.
Steve
0helpful
1answer

I have a 1988 Yamaha virago 750 my problem is that the front cylinder does not fire up after a while not always but often if you start bike it runs fine for 10 minutes or so then looses power because the...

Next time you get it warmed up, check the compression on the front cylinder when it quits. Be careful of course since it will be hot. It is possible that you are losing compression when everything heats up and expands, but it comes back when the bike cools.
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1996 yamaha virago 535. no power on top end,50mph tops-- pulled rear spark plug wire off with eng. running and no effect. looked at spark plug- Black and smelled of gas. Please --- any suggestions??

1 st check compression on that cylinder by taking spark plug off and getting a compression tester and screw into spark plug hole then turn the engine over and if the compression goes over 100psi/7.5 bar then your ring are ok a picture below will demonstrate get back to me if the ring are ok i have more solutions d292560.jpg
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