Question about 2003 Suzuki DR-Z 400

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Not starting backfiring through carb

Blue smoke out of exaust flames coming through back of carb to airbox

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  • jjgreenwitch Feb 16, 2009

    very helpful going to try these now in hope it works thankyou jj



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Check valve tappet clearance 1st., adjust to specs., do a leakdown test on top end w/ a set of leakdown guages, also take compression test. probally need a new spark plug & air filter too.sound like a leaking intake valve, probally requiring top end disassembly & repair.

Posted on Feb 16, 2009


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1 Answer

Engine backfire

1. Carbs not cleaned correctly
2. airbox not sealed to back of carbs or no air cleaner in it
3. intake manifolds broken or open and leaking air
4. any open vacuum lines will make a backfire
5. a lean condition on the engine
6. possibly valve problems or cam timing

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I have a 2001 yamaha yz426f that backfires after start and shoots flame from exaust and the exaust gets so hot it glows red.

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.
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1 Answer

Backfire in airbox

The fuel system(carbs, tank, and petcock) needs to be cleaned out. If you are not familiar with the process, taking it to the dealer or a mechanic is best. I have also written other articles on fixya about cleaning carbs

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My 1997 yamaha xtc 600 vmax is back firing and wasnt doing that before


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I have an exhaust leak coming from my manifold, it is back firing with blue flames, What is this problem?

Flames out the carb--- is an ignition timing problem

Bad timing chain or gears,distributor in wrong,wires on wrong

Dec 03, 2012 | Cars & Trucks

1 Answer

Does someone know how to shut off the electrical plug at the bottom of a v-twin briggs and stratton. I think this is causing my motor to smoke bad out the exaust. thanks

Are you refering to the solonoid on the bottom of the carb? That is an anti backfire device. It will not cause the motor to smoke. If it has failed the motor will not run; the solonoid prevents fuel from entering the main jet.
There are several things that wil cause a motor to smoke. First check for fuel in the crankcase. To check for fuel in the crankcase, it is hard to see on the dipstick, remove the dipstick and VERY CAREFULLY away from anything flammable and away from the motor hold a lighter to the dipstick. If the dipstick lights it has fuel on it, a lighter will not ignite oil. Blow out the flame and wipe the dipstick clean with a rag before inserting back into motor. A worn needle or debris in the needle will cause the carb to flood. It will fill the crankcase and muffler with fuel. To cure this you will need to rebuild the carb and change the oil. Installing a shut off valve in the fuel line will prevent this in the future. After the service has been done the unit may smoke for 5-10 minutes while it burns off the fuel in the exhaust.
Burning oil indicates stuck rings, overfilled oil, or worn valve guide seals ( valve guide seals will smoke on start up then clear up).
Also leaking rocker covers will drip oil on the exhaust and burn off.

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1 Answer

The check engine lighr comes on & stays on at 69k mikes- Iver tightened the Fuel cap.. Whats happening ?

2002 isuzu axiom engine light was off and on replaced the egr rear top left engine 2 bolts and snap out harnes, make sure you clean well with carb cleaner while running, plug back openning to exaust as flames may ocur from exaust and carb cleanner is combustable. spray carb cleanner in front hole little by little while engine is running. you will now by hesitation of engine when spaying.

Feb 24, 2011 | 2002 Isuzu Axiom

1 Answer

87 325 runs good when

It's the automatic choke!

The choke is "closed" or barely open... When cold, the engine needs a RICH mixture (more gasoline, less air). When the engine warms up, it requires a LEAN mixture (less gas, more air).

It is probably creating BLACK tailpipe smoke ... that means unburnt gasoline. (Blue smoke is OIL, white smoke is WATER).

Put the parking / emergency brake ON.
1. Remove air cleaner assembly from intake, use a carb cleaner spray or throttle body spray cleaner and spray just a little. (AutoZone $5)
2. Find the accelerator2.gif arm under the hood.
3. start car, rev the engine to make sure how to operate the accelerator from under the hood.
4. Carefully spray into carb / throttle body and work the accelerator ... don't let the engine die...
5. Watch out for "backfire"... it may create a small flame out of the carb. It will extinguish itself in one second.

6. You may need to do this two, three times.
7. Add a "complete fuel system2.gif cleaner" to your next tank of gas ($8).

That's it! ... pretty cheap, too.

Hope this helps!

Sep 04, 2009 | 1987 BMW 3 Series

2 Answers

Blue smoke comes from exaust is it carb or rings

Blue smoke means oil is burning. The most likely reason is oil is getting past your piston rings because of wear. Run a compression check. If it is less than 150 psi it is time for a rebuild. It may run for a while burning oil and you will want to replace most of the parts anyway so it probably won't cost you much more money to keep running it until it dies. Just keep a close watch on your oil, if you run it out of oil it won't run for more than a few minutes.

Apr 07, 2009 | 2003 kawasaki KDX 220 R

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