Low engine compression can also cause: rich jetting, spark plug fouling, and low power output. ![]() When the compression gets too low, it can’t compress and combust all of the air and fuel – this causes a rich jetting mixture. When you have the right amount of fuel, air and spark, it’s time to check the engine compression. Whether it’s a pit bike bike or full-sized dirt bike, 2 stroke or 4 stroke, they all operate on the same fundamentals. Perhaps the plug is fouled and just not creating enough or any spark to ignite the mixture. If there is no spark, even in a dark room, the next step is to try replacing the spark plug. Slowly kick or turn the engine over (in the dark makes it easier to see) and you will see a small blue spark jump across the electrode/tip of the spark plug. “No spark” can be caused by a fouled plug, a loose plug cap, a bad wire, a faulty ECU, or a bad stator.īut first, let’s check to see if that’s the case, because no spark is not as common as the other problems.īy taking the spark plug out but setting it on the engine with the plug cap installed you can test for spark. If you have fuel, air, and compression but no spark or not enough spark then your dirt bike engine can’t ignite the mixture and it won’t start. This means that it’s mostly likely not getting: spark, the right amount of air, enough engine compression. If it still won’t start or make any kind of combustion noise, then you can confirm that it’s getting fuel but still not starting. Otherwise, you can try squirting some starter fluid into the carb if it’s easier to pop it off of the intake boot. On a 2 stroke, removing the spark plug is as easy as unscrewing the plug on most models.įor some 4 stroke dirt bikes you may have to remove the gas tank to access the spark plug hole. To confirm that it’s getting fuel, you can put a few drops of gas or starting fluid into the engine through the spark plug hole. Both of these options will get more gas to your carb and possibly give you enough to get it started,Ī shiny bike is no good if you can’t start Bike won’t start even with starting fluid Pro tip: You can either turn the gas petcock valve to “reserve” if it has that option, or you can lean your dirt bike way over almost onto its left side to get the gas onto the side of the tank that has the petcock. Even if there is some gas left in the tank, it may not be high enough to get down through the petcock filter and to the carburetor, but there’s a simple trick you can do to see if that’s your problem. It’s easy to forgot to add gas to your dirt bike tank, especially if you don’t ride very often. Have you confirmed that it’s actually getting fuel to and through the engine? From the gas tank, through the fuel line, to the carb float bowl, and into the engine, it doesn’t take much to clog a passage. 2 stroke has fuel and spark but won’t start In this article, I’m going to show you the practical steps I take to get a dirt bike running when it won’t start and how to start diagnosing the problem. Those are just 2 parts to the equation, and just because you’re getting fuel and spark doesn’t mean it’s the right amount. But it doesn't.You want to ride but your dirt bike won’t start but it has fuel and spark. ![]() It's easily got a gallon or two in the tank. I can't really test it until tomorrow anyway. Maybe spark plugs, but those were all replaced awhile back. ![]() That leaves fuel pump, correct? If it was a compression issue, I'd imagine it wouldn't even start. I mean, it didn't seem like enough to defy gravity and reach the carbs. I'm no expert or anything, but that doesn't seem like enough to me. It's definitely pumping some because I took the line off and attempted to start it and it spit a slight trickle. The Pump does power on, but who knows if it's pumping enough gasoline. the pilots were a little gunked, but not enough to cause a no start. I had to give it some throttle, it reved to 4 rpm's, in shock and awe, as I wasn't expecting it to work, I let off the throttle and it slowly died.
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