Question about 2004 Yamaha YZ 450 F

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Yfz450 not starting, no fire to plug, don't seem to power to lights either

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My 08 yfz450 has pressur when i take out the oil plug. is that suppose to happen?

Posted on Jun 27, 2010

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Then either the stator plate or voltage regulator is shot. You can test both with a voltmeter

Posted on Sep 10, 2009

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Starting at the battery use a testlight or, a meter to find the break in the wire loom; that goes to both the ignition and, the lights; most likely it is a bad fusible link.( a small, short one inch long wire inbedded in a larger wire this should be blackened or, very flexible if it is bad.

Posted on Sep 10, 2009

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1 Answer

Can anyone give me instructions on how to change the head gasket on my 05 yfz 450


Hi, Josh for more information about your question and free downloads that you need please visit the websites below. Good luck and have a nice day.
Yfz Top End Rebuild Yamaha YFZ450 Forum YFZ450 YFZ450R
http://thequadconnection.com/Manuals/YFZ450%20SERVICE%20MANAUAL.pdf
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Crank sensor if it has one,timing belt skipped is a possibility,and always the dread security key problem.don-ohio

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Yfz450 atv2006 bike was running fine except at top rpms cutting out . took it to a shop they adjusted the valves clean carb change oil and they cant get no fire replaced cdi box no got 4 sparks and then no...


It is hard to say what's wrong Jeff. You took it in in running condition, the shop should return it in running condition, ESPECIALLY if you took it to a Yamaha shop. Don't let them hand it back and say " we can't find the problem ". If they truly can't find it, the District office for Yamaha USA should be notified. They don't like it when a dealer doesn't have competent mechanics. Worst case is you take it to a different dealer. Chances are there is either a short in a wire or the pulse coil is shot.

Aug 15, 2011 | 2006 Yamaha yZ 450 F

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Engine runs rough seems like it stutters but still has a good amount of horse power


A tune up may help, plugs, wires, fuel filter, air filter, if this don't take care of the problem could have a bad coil pack, you can check the coil pack, get some vacuum hose and cut 6 pieces about 3 inches long, put a piece of hose in the plug wire and the other end of hose on the coil, do all 6 wires, do one at a time so you don't get them mixed up, start engine, take a test light hook to ground and touch probe to each piece of vacuum hose, this will short out that cylinder, you should notice engine change, if no change, that coil may not be firing.

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2000 honda 1100 shadow spirit. Rough idle, little power.


Replace the spark plug caps and try again. On Honda's the cap is often part of the wire (a dealer part) NGK makes some inexpensive plug caps about $5 each. They should OHM out to 5000 anything above or below and you need to replace them. This should fix the problem.

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Atv is back firing when i let off the throttle 2004 yamaha yfz450 with a complete fmf factory four exhastmodquad with k&n air filter


sounds like your quad is running a little too rich. try leaning it out a little by adjusting yor mixture screw.

May 15, 2010 | Motorcycles

1 Answer

I have a 2005 yamaha yfz450 when i turn the ignition on the nutreul light comes on so the batteries charged then when i press the start buttun nothing happens... i checked the plug and there was no spark...


hi,because the light comes on,it doesnt necessarily mean the battery is charged,the neutral light draws very little and will come on at about 3 volts you need at least 12.5 ,so check the voltage across the battery and charge if needed,hope this helps..cheers

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1 Answer

Starter going but no fire up.


Sounds like your relay from your starter or your plug wires might be out. Or your plugs might need to be changed or calibrated right to continue running.

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