Question about 2006 Yamaha yZ 450 F

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2006 yz450f back fireing @ quarter throttle to half and smoking. sounds good when reved up

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Hi, Gregg love that name 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.
06 YZ450 backfire and poor idle help YZ 400 426 450
Dirt Rider Magazine
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf

Posted on Aug 10, 2016

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6ya6ya
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Posted on Jan 02, 2017

Motoxpartson
  • 185 Answers

SOURCE: ive got a 2006 yz450f

With setting the cams it can only be right or wrong there is not really any way to be a little out unless the cam chain itself is severely over stretched...
set (I) mark on fly wheel to be visible within the marks on the inspection hole of ignition cover (always a good idea to cross reference TDC by probing the piston through spark plug hole as I have seen many flywheels shear their woodruff keys and give incorrect TDC readings) any how, once at TDC set the cams ( lobes facing outwards with the dots on each cam aligning best you can with the head. with your finger take out the slack of the cam chain through the tensioner hole and double check all dots and (I) mark on fly wheel still all line up correctly - if so then your good to button all back up... Don't be alarmed if takes a few goes it's perfectly normal to have at least couple of attempts to get all correct.
You want your valve clearances to be 0.20 on the exhaust and 0.10 on the intake side a tiny amount bigger gap is kind of OK but never smaller or you will do damage !
Backfire although can be caused by timing out or valves clearance incorrect in my experience is nearly always due to lean on fuel, could be worth double checking your pilot jet and circuit is all clear - compressed air cleaning them is best or stick new pilot jet in to be fool proof ! and air clean the hole the pilot jet screws into..
Happy to elaborate on any points if needs be, just let me know
good luck regards Jamie

Posted on Sep 13, 2011

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Hi, Stephen and the usual suspects are:
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2. Float valve sticking.
3. Float valve and/or valve seat is worn or damaged.
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Hi, Aaron and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Fuel line to carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
11. 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.
12. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box if applicable.
17. Tilt sensor needs a reset.
18. Security system not disarming alarm needs a reset.
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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http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf
OEM parts for Yamaha
YAMAHA YZ450F Owner Service Manual

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