I understand you have a spark but is the spark strong enough? A weak spark is the worst kind to have, as it causes you to discount the ignition system as the root cause of your no-start. If, after running the Gas shot test, you find you may have a spark issue, then you’ll want to check your spark again. Since a lack of spark is the more likely issue, we’ll look at that fault first before checking compression and timing. This result tells us that you may have an ignition system fault or a compression or timing issue. These links will help you nail your fueling system diagnosis and repairs –Ģ – The engine doesn’t start and critically makes no attempt to fire. Draining and refueling usually, does the job, remembering to add fuel stabilizer to help prevent a further issue. If this sounds like your problem, great! Go ahead and examine your fuel system, remembering stale gas is the number one fuel-related no-start issue. Bad gas, Choke not working, Faulty fuel pump (if fitted), Blocked gas filter and Carburetor fault are all high on the list.
This result tells us that your ATV suffers from a fuel issue. Firing can be identified as the engine not running, but smoke is seen at the tailpipe when cranking. With the test out of the way now, we’ll need to analyze the results, and the two results likely are as follows:ġ – The engine started, or fired (fired – meaning attempted to start). Mechanic top tip – A funnel or syringe makes adding gas to the cylinder a ton easier. Add small amount of gas (about oil cap full) (gas must be fresh).The gas shot test is an elimination round and answers many questions very quickly. Gas Shot – The gas shot test is a simple test where we pour fresh gas into the cylinder. Is Choke Working Correctly? – I understand this can be difficult to answer and will require some stripping to access the carburetor etc., but I got you covered there’s a shortcut known as the “Gas shot.” Remember, the lower the ambient temperature, the harder your ATV will be to start. I say Ok, but is the weather colder now? If so, the engine likely just needs some choke. Sure, you say, but my ATV started fine without choke previously. Then I’ll move on and run the following checks.Ĭorrect Cold Start Procedure – You likely already know the correct procedure, but if you are unsure, go ahead and google your make and model to verify. I like to check the air filter early in the troubleshooting procedure removing the filter and attempting to start the engine is a fast way to eliminate it as a possible issue. Choke DiagnosisĬhoke diagnosis consists of first checking whether the correct starting procedure is being used and, if so, if the choke system is working correctly. Starting most engines will require using some type of gas enrichment to counteract the oxygen-rich mix associated with cold starts.ĭraining old gas and refilling with fresh, consider adding a fuel stabilizer to keep the gas fresh for about a year. Basic ATV No-Start Checks Starting Procedure And so, work with me here, and let’s assume nothing for the next few paragraphs.
As a trained technician with twenty-five years under my belt (and, of course, been bitten a few times), I like to check a fact is a fact.Īnd so, with that said, I like to verify some common errors I know this may seem trivial, but I’m often surprised by the errors made by simply making assumptions. As said earlier, you are on the correct track, and very shortly, we’ll have this figured out.īefore we get knee-deep in diagnosis, let us make some simple checks first, and here’s why. Diagnosing ATV Spark & Fuel But No-StartĬhecking spark and gas is among the first checks to make when diagnosing a no-start.
Without a compressed combustion chamber, the mix isn’t confined or heated to a point where conditions are perfect for ignition, and so the starting sequence of ignition, combustion, and power stroke doesn’t happen. The third and final ingredient is compression. A weak spark will be extinguished by the fuel mix instead of igniting it. Our engine isn’t going to fire with just any old spark, no sir, that’s not going to do it.
2 Sparkįresh gas is great, but without a spark to ignite our fuel mixture. So without fresh combustible gas, an ATV will struggle to start. Stale gas lacks oomph it isn’t as combustible as fresh gas and so starting an engine can be challenging, especially when the engine is cold.
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