Have changed over, spark plug,coil,rectifier,relays,pulled apart every wire and put back with no corrosion,but quad has a mind of its own with the spark,1 minute it may run for a while the next no spark,im very puzzled.HELP!!!!
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Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
Good luck and have a wonderful day.
just guessing that you have already changed the spark plug??!! Handlebar on/off switch in the on position? (yes, I have seen this come to the shop). After this you need a shop manual to check wiring connections, resistance values..etc.. if not... might be shop time.
Check your Air Filter, clean it out, check for obvious blockages. Change the filter if it looks well used (look for excessive dust or color change on the inner part of the filter) or obvious wear.
Check for other blockages around the air filter inlet.
Check the spark plug, just change it for a new one so that eliminates that possibly.
Check your fuel filter and replace if needed.
Check the fuel tank for corrosion or dirt in the fuel. Empty it out, Clean it and add new fuel, be sure you have the correct fuel.
Check your Air / Fuel mix adjustment screws on the carburetor.
what kind of a small noise? Describe? Is it a click, or a slight fizzle sound? If it is a fizzle sound, make sure none of the earth wires have come off the battery, or poor earth grounding. If it is a click, it could be the start relay/ignition coil. I dont have the model ATV you have, but mine has a small retangled black box, smaller than a pack of matches, if you follow the wires from your ignition coil. hold that and start and feel a click. The relay will send current to your starter. No click, no start. So check the ignitiion coil. Another problem can be a starter continual trying to run - which is a sticky relay.
They are simple things, spark, and fuel, and they run. I think you are having the same problem as I did.. someone before me fitted a kill switch and one of the wires came off the earth there, and it wouldnt start. Mine was under my seat, but it's a chinese quad, so just folllow the wires to the battery and from the battery until it meets the chassis.