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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  • 66 Answers

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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Posted on Jan 02, 2017

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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

Apr 06, 2014 | Honda CB 750 Motorcycles

1 Answer

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.
http://www.raptorforum.com/forums/66-raptor-660-maintenance/71417-just-cleaned-carb-now-exhaust-getting-red-hot-after-idling-only-2min.html
YZ 426 RED hot header pipe backfiring YZ 400 426 450
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3

Feb 08, 2014 | 2001 Yamaha YZ 426 F

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

Nov 19, 2013 | 1996 kawasaki ZZR 250

1 Answer

My ktm 450 exc 2005 burns oil and makes blue smoke and I have got oil in airbox but i dont know why it is burning oil. What could it be. Please help


this is usually because of a few things,,,check,,,, and maybe change your plug,,,check gap,,,,adjust your carb,... it sounds like it is way to rich,,,,,lean it out a little,,,,,,and the worse problem,,,,,your rings on the piston may be getting worn,,,,and allowing oil to seep by,,,thus,,going into your airbox,,,,,,and combustion chamber,,,,, then blue smoke,,,,, take a compression check if all else fails,,,,,,, this will tell you if your rings are bad,,,,,, JOEL

Aug 19, 2010 | 2005 KTM EXC 450 Racing

1 Answer

My honda cbr 600 wont start and keeps backfireing


Check your plugs. If all four are sparking then your carbs are out of sync. They will need to be re-balanced.

If you are capabable in doing this job your self, you will need a screwdriver that fits your adjuster screws and a CarbTune Carb balancer.
Remove your tank and airbox.
You should see the flaps inside your carbs. These should open when you move your throttle.
Start on the outside carbs to get them balanced with the 2 centre ones.
To start, unscrew the adjusters all the way out. then screw them in until the 2 outer carbs move at the same time as the inner 2 carbs
Once this is done then adjust the centre balancer to syncronise the 2 left hand carbs to the 2 right hand carbs.
Now if you have done this correctly, all four carbs should open at the exact same time.
If you have a Carbtune balancer, remove the plugs from the top of your inlet manifold and plug in the hoses from the carbtune balancer.
Start the engine and adjust the screws until the weights inside the Carbtune balancer all read the same.
Once done, remove the balancer, replace the plugs into the inlet manifold, refit the airbox and tank and it should run so much better.

If your not 100% confident to unertake this job yourself, take the bike to your local dealer and ask to have the carbs balanced.

Mar 15, 2010 | 1991 Honda CBR 600 F(2)M

1 Answer

Bike backfires,dies,restarts runs fine


your carbs are dirty. and probably need to be balanced also... bring the bike bto a garage and have them cleaned by a profesional.... also after market pipes don't give your bike the proper back pressure .. that can mess up your carbs timing

Jun 16, 2009 | 1996 kawasaki VN 1500 Vulcan Classic

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

1 Answer

Very heavy smoke/backfire


Moisture is not likely to be the problem. Though trying to help, your friend made problems worse by messing with the carbs. The backfire is caused by incorrect carb balancing and incorrect carb synchronization. Your bike is 27 years old. The Honda shop probably will not work on it but you could ask. If the shop won't fix it then ask if any of the mechanics work on bikes at home. Any chance your friend messed with the spark plug wires?

Mar 24, 2009 | 1982 Honda GL 1100 Gold Wing

1 Answer

Backfiring through airbox


K.T.T moister can cause your bike to do most or all of the tings you said. Especially if your plug wires are cracked and worn. I suggest running some new wires and boots and use dialectic grease at the plug and up at the coil this will keep moister from buggering things up. Now if this doesn’t solve things then you might want to think about syncing your carbs. if you haven't already Checking your timing wont hurt as well.

Nov 10, 2008 | 2003 Yamaha FJR 1300 A

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