Question about 2001 Yamaha V Star 1100 Classic

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Back fire and dies while running at variable rpms and speeds

2000 Big Bear 400, good gas, good spark, clean air filter...runs good thten back fires a few times and cuts off like someone turned it off. ALmost as if it needs to sit and cool then starts up just fine again. Any ideas.

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  • sts502 Jun 25, 2009

    Thank you very much I'll give it a shot, any other ideas if thats good

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Could be one of the ignition coils breaking down when hot, if you can (without getting burnt), remove the plug cap, place a screw driver in there holding the insulated handle and turn the engine over whilst holding it close to the engine, you should see a spark IF its ok, if not then the coil has failed. Retry when cold to confirm.

Posted on Jun 23, 2009

  • phil_davies9 Jun 25, 2009

    it could also be fuel starvation, does it re-start straight away after dying?

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18Hp v b&s backfiring or poping thru the carb almost start but wont i have fire so idk its a john deer gt 235 2000 the. Ignition mod went bad, i would just start turning over when i would the key to run...


Since the machine is a year 2000 machine, I assume it has several hundred hours on it? If this is the case, it may be your valves need adjustment.

Valves that are out of adjustment will allow the engine to spin more easily than normal because they are not locking the cylinder for proper compression. More importantly, they allow the fired gas vapor to flash back through the carburetor or down through the exhaust. This is heard as a backfire while cranking the engine and it results in a non-starting situation.

The good news is...it indicates you may not have a problem with fuel or spark.It's a problem of Air control.I am going to add my simple starting diagnostics below this post.

All engines that are working correctly internally need Air, Fuel, and Spark. Bad valves (out of adjustment or worn) give you problems with the Air component.

Prior Post:
Let's say you have less than 300 hours on the engine. Let's further assume it worked last summer, or last week, but now it's acting up. Let's also verify the battery is in good shape and fully charged.

A mechanically functional (meaning all the internal parts are working, i.e. pistons, valves, etc) engine requires 3 things, air, fuel, spark. So the quickest way to start your diagnostics is to remove the cover over the air filter and then remove the air filter. I do not recommend spraying Quick Start.
  1. remove air filter (set it aside for the rest of the diagnostics)
  2. put throttle on fast run (do not choke)
  3. pour an ounce or two of fresh gas into the carburetor
  4. crank engine (15 to 20 seconds, rest to cool the starter, repeat 3 times if it does not fire at first).
Removing the air filter and placing the throttle at full speed with no choke eliminates the "air" question. Dumping in the fuel eliminated all fuel related questions. What's left? Spark. If the engine fires and runs a bit, then dies, you have eliminated the spark question. The engine started so Spark and Air are good; you have to track down a fuel problem.

If the engine does not fire, you have eliminated the Air & Fuel questions; you must tract down a Spark problem.

Tracking down fuel problems.
  1. Make sure there is plenty of fresh fuel in tank.
  2. Remove fuel line from filter and remove the filter, gas should pour out of the hose coming from the tank. If it does not, remove gas tank cap. If fuel flows now, you need to unclog the cap vent or replace the cap. If the fuel still does not flow then blow air from the filter end of the hose back up through fuel line to blow out blockage inside the gas tank. Once you have fuel flowing out the line to the filter, PUT ON A FRESH FILTER. Try cranking the engine. If it still does not start move on to the carburetor.
  3. Note: many systems have a fuel shut off solenoid. This is a small black cylinder on the bottom of the carburetor. It has two wires running to it. It should make an audible click when you turn the key on.
  4. NOTE: if battery voltage drops below 9 volts when cranking or while the engine is running, the fuel solenoid will not function. That means the engine will not start or will die soon after starting. So check your battery voltage before, during, and after cranking. If the battery voltage is good before but drops below 9 volts while cranking this is generally a sign the battery has one or more bad cells. Replace the battery. If the battery is in fact good and the voltage is still dropping you may have a bad starter motor and it is drawing too much amperage.
  5. Ck to see that the carburetor bowl is full of fuel, if not...you may have to disassemble and clean the carb at this point.
Tracking down Spark problems.
  1. verify battery fully charged.
  2. verify the fuel cutoff solenoid clicks when you turn the key switch
  3. get fresh spark plugs and verify gap
  4. install plugs and crank. Perhaps verify spark with a spark testor
If these simple steps do not solve the spark problem, you have a Spark problem that moves into the arena of complex. You will need to check coil gap and coil performance. If it still doesn't start you will need to diagnose the electrical system for wiring and safety switch problems, key switch problems, fuses, etc.

A Problem of Air Control.
If you determine the Spark & Fuel systems are good, the next likely problem is Valve adjustment out of wack. This is a problem of Air Control (and its sister compression), the third element in the engine trinity. Usually this problem shows up as backfire; either back through the carburetor or out through the exhaust. It will backfire while you are trying to start it.HOWEVER, it does not always generate backfire. You may instead notice that the engine spins more freely than usual; or oddly enough just the opposite and the engine bind while you are cranking it. This is because the compression is lost by out of wack valves or the compression occurs at the wrong part of the stroke. You need a valve adjustment.

Once you get it running be sure to replace the Air Filter with a new one.

These simple steps solve most starting and running questions and problems.

Mar 04, 2015 | Garden

1 Answer

Spec vin ecu specs


If it turns, then the battery is OK. Either spark plugs are not firing in proper order (wrong firing order), no power to spark plugs, or no fuel because of fuel restrictions (dirty fuel filter). Inspect the air filter to ascertain its not clogged air. If you smell gas, then you saturated the spark plugs, which is why it refuses to run.
Let it sit for half hour to let spark plugs dry. Inspect to ascertain its not dirty spark plugs, which will also prevent engine from running. After ascertaining its proper firing order, spark plugs are clean, and there's power to distributor cap, ascertain there's fuel in fuel lines by squirting half second (short squirt) of starting fluid into air filter. Close the air filter housing to trap flammable starting fluid gas. Turn engine without giving throttle. Let starting fluid be ignited by spark plugs. If it won't start, then spark plugs are not firing to ignite starting fluid gas. If it starts briefly, but won't run when you give throttle, but catches when a 2nd person squirts more starting fluid into air filter just before engine stalls, then its a fuel restriction issue or no fuel in fuel lines.

Nov 29, 2013 | Cars & Trucks

1 Answer

I got a 95 big bear and i got a problem with a rough idle and back fires


If it's been sitting around for a while it could be the idle jet has a little craip in it (it don't take much) but if it's spitting fuel out then I would make sure the float levels aren't sticking.

Apr 04, 2017 | Yamaha 2005 Big Bear 400 4x4

2 Answers

Saw won't start without starting fluid.


Sounds like you have a compression problem. Starting fluid will fire at a much lower compression than a gas/oil mix so that's why it will start with it. When the motor is running you get a little more compression because the piston is coming up so fast. You should check the condition of your cylinder wall and piston & ring. If they are damaged at all you loose compression which directly affects starting and running power.

Mar 28, 2012 | McCulloch Garden

1 Answer

Hd 96 roadking efi. Idles ruff and when given gas in gear wants to die unless i give it full throttle. Put in new wires and plugs and after a few minutes of running plugs were black. Also back fires when...


Check the air filter is clean, and the ignition for correct operation. The plug indications are that the engine is running rich (too much fuel) or that the ignition spark is weak.

Mar 17, 2012 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

02 Big Bear 400- Hi-idle & backfires while running. Tried cleaning carb & air filter, drained bowl & cleaned with carb cleaner. Could there be aproblem with the choke.


Sounds like the carb could use a cleaning and setting by a professional...install a new plug and a new air filter.. AFTER the professional carb cleaning and setting.,,do this and repost

Oct 16, 2010 | Yamaha 2004 Big Bear 400 4x4

1 Answer

My Bear Tracker 250 would not run well. It was cutting out and seemed to be starving for fuel. I took the carb off and cleaned it with carb cleaner and put it back on. Now it will not run at all. Fuel is...


Are you sure it has a good plug and spark? If not you might have bent the float when you cleaned the carb, try spraying starting fluid in the intake and crank the motor, if it fires the problem is fuel, one of the Jets in the carb might be clogged also make sure you have no water in your gas.

Mar 01, 2010 | 2004 Yamaha YZ 250

1 Answer

Have a 04 yamaha big bear 400. hard to start wont stay running unless chock is on spits and sputters and ocacionaly back fires. when try to throttle it it boggs through intake.


I have an 01, and it started doing this. I don't remember the circumstances. It's just dirty in the carb I think.

1) Check for water in the gas.
2) Turn off the petcock and drain the carb. turn it back on.
3) Try it.
4) Start it with the choke on and put your hand over the air filter hole. Will cause some back flow.
5) Try again.

Worked for me. Might be dirtier on yours, or have mud in it or something.

Nov 08, 2009 | 2003 Yamaha XJR 400 R

1 Answer

Won't Start


do you have compression? for a engine to run you need clean air,compression, good fuel(make sure the fuel has not been there 3 months or more as it will deteriate) and good spark as well as good exhaust as this will cause a back fire if the exhaust valves are not set right.

Apr 21, 2009 | 2001 Yamaha V Star 1100 Classic

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