Question about 2004 Yamaha YZ 450 F

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My o4 yz450f backfires alot how do i get rid of it

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Also, it will pop on decelleration if it is too lean

Posted on Jul 23, 2009

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  • Master
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If fuel & timing are ok it will be the diaghram in the carby pulsating too much & or its spring is week!

Posted on Jul 19, 2009

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1 Answer

Yz450f


Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. 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.
So Yamaha still has no clue about gas in the oil YZ 400 426 450 2007 2013 Yamaha YZ450F Service Repair Workshop Manual Download Manuals...
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Mar 20, 2014 | Yamaha YZ 450 F Motorcycles

1 Answer

Backfire not starting


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.
New Top End YZ450F Won Start YZ 400 426 450
07 yz450f backfires when kick starting
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Mar 04, 2014 | 2007 Yamaha yZ 450 F

1 Answer

2003 yz450f running too lean


First, try to avoid ethanol. It melts carb lines, and can goo up small passageways. Get some good gas and try again. Hi test if necessary. Check your specs, maybe the bike requires hi test.
Taking apart and cleaning involves soaking in fresh carb solvent to clean the small passageways. Is there an air cleaner? It may be clogged, test with it off.

Nov 22, 2013 | Motorcycles

1 Answer

2003 yz450f too lean backfiring on deacceleration


clockwise is rich & cc is lean which way are you adjusting?
clean the small air port in carb with adjustment screw removed.
Screw should be set 1 1/2 turns fron light seated position.

Nov 21, 2013 | Yamaha 2003 Yz450f Yz450 Yz Wr 450 Stator...

1 Answer

I have a 2008 yz450f , I was practicing at Glenhelen sat . After 2 practices without any problems. 3 laps into the 3rd. Moto it backfired and died. The motor.kicks over but wount fire. Carb. Is getting...


Hi, Ssfichter1 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. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Accelerator pump damaged or not working.
11. Water or dirt in the fuel system, carburetor or filter.
12. Restricted, blocked or kinked fuel line.
13. Fuel tank empty.
14. The gas cap is not venting properly or fuel tank venting system blocked.
15. A failed fuel pump, pressure regulator and or fuel injectors.
16. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
17. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you need please click on the links below. Good luck and have a nice day.
2006 YZ450f backfires then dies YZ 400 426 450
2010 YZ450f starts but soon stops bike stalls FOUND ANSWER
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf

Feb 26, 2012 | 2007 Yamaha yZ 450 F

1 Answer

I have an 04 yz450f and have a pretty bad backfire. it is mainly when I let of the throttle. I have rebuilt the top end and cleaned my carb. I have owned the bike since it was new and always lived at the...


Give the exhaust system a thorough inspection...leaks especially close to engine where the exhaust is hottest leak out under load...but can draw air in under deceleration....any unburnt fuel will ignite with the fresh air and high temperature.

Mar 16, 2011 | Yamaha YZ 450 F Motorcycles

1 Answer

2007 yamaha yz450f... while riding last week it was backfiring on deceleration. it blew a 5 inch hole in the header pipe. i purchased a new one, cleaned the air filter, changed the oil and put a new spark...


Exhaust leaks near the exhaust port can draw air into pipe on deceleration and detonate any unburnt fuel leaving engine, causing backfire and high temps.
An overly lean fuel mixture on the engine can make decel backfire worse too.

Mar 13, 2011 | Yamaha YZ 450 F Motorcycles

1 Answer

Hi there guys i have a yz450f 2005 was running like a dream no moke started real easy, then it just stopped. no bangs or noises but now it seems harder to kick and it will back fire then can hardly kick it...


Hi, Kurtn420 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.
07 yz450f backfires when kick starting
yz450f popping backfiring
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf

Sep 25, 2010 | 2003 Yamaha YZ 450 F

1 Answer

Backfiring like it is running lowing on gas but still have plenty of gas.


this to me just reading this sounds like a timing issue at idle you miss it's retared tomuch or advanced a bit under throlle your ok so setting maybe just lit out what sort of miles o4 im geussing 10k prob neededs a pro service done hope this helps

Jul 05, 2009 | 2004 Yamaha V Star Classic

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