I have an 2007 yamaha yfz450 quad and it isnt getting spark to the plug i replaced the coil and have had it trickle charging and still isnt working right what else could be wrong wit it i don't want to buy a new battery or cdi unit until i know for sure

Question edited for full 'year make model (what it is).
Question moved from motorcycles to make model category.
Please don't type in all CAPS, it is considered SHOUTING and is harder to read.

'clips' and 'turns' it took me a while to realise you were talking about the carburetor and you were playing with the mixture screw and needle position! 4 turns out is a lot different to the factory setting which is 1 1/2 turns out.

If it is overheating it is running too lean. As you changed the stator, also consider the ignition timing. Popping can also be caused by the ignition failing under load, coil, lead and spark plug.

Carburetor and tuning.

https://www.google.com/search?q=2004+yamaha+yfz+450+carburetor+adjustment

This carb has a LOT of jets!

https://www.amazon.ca/Carburetor-Rebuild-Yamaha-YFZ450-2004-2009/dp/B07JNYP667

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Hey Michele,, if the original battery lasted this long.. you are lucky,, just replace it. >>> Always use the exact replacement battery<<<<... your quad is designed to take the exact size and amperage rating,, trying to change this is inviting too much trouble,, When you get a new battery,, it will be charged unless you purchase one online that comes with the acid pack,, EITHER WAY - put the battery on the trickle charger for 48 - 72 hours BEFORE you use it.. This will extend the life of the battery a bunch and make it a stronger battery,, ..(this is from too many years of experience.)

Hey Jason,

What?? .. slow down and give me more specific detail.. this is not a complicated problem .. just need more info.. could be a simple clutch adjustment... or you need new clutch fiber plates??

SOUNDS LIKE YOUR ENGINE IS IN DIRE STRAITS

follow the wire from the starter button to the first connector unplug it and get a jumper wire connect in one side and touch it to the other side should only be two wires with key on if starter rolls then it is the starter button need cleaning or replacing

There is no voltage specification listed in my manual but it does specify that the charge coil resistance test should be between 270 - 330 ohms and the pulse(pickup) coil should test from 171 - 209 ohms, figures listed are for coils around room temperature of 20 degress celcius

It is likely a short in the ignition switch

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

I'm not familiar with all quads and all the kill switch locations. Does it have a tip-over kill switch? Is it working? Is the quad in neutral? Is the neutral light on? Many engines will not spark if the neutral light is not on. Are the headlights off when starting?

How good is your battery? A low battery can kill spark. Test for spark by grounding the threads of the plug against the cylinder. Have a friend kick the bike while you watch for spark. Assuming no spark, then check all the kill switches with an Ohmmeter to be sure each switch is working properly. Sometimes a switch goes bad. Try disconnecting all kill switches then check spark.

Check the wiring harness, even under the gas tank and seat. Are all the connectors clean and with a tight connection? Any abraded wires? Check the ignition switch also. The switch can go bad as well. Are the flywheel coils good > is the battery getting a charge?

Still no spark? If CDI then get it checked.
If points then file or replace them along with a new condensor and reset the gap then time the engine. >> I hope this helps.

Please rate this answer. Thanks trsrhntr!