So feel free to diagnose in any way you think you’ll be able to get to the solution faster. This is regardless of the order that is listed here. With the history of your bike in mind, you will be able to make an estimate of what the issue might be. You are the one who knows when and what has been done to your bike in the past. So it is up to you as the owner of the bike to note the history and age of your motorcycle. Meaning, any one issue can come before the other. It is important to note that the order in which this guide is made regarding which issue came first, is not ironclad. Check the float distance then make the necessary adjustments. Disassemble to open the float chamber and check the rubber float for any damage. Note: this requires some professional expertise, otherwise be precise when doing it yourself. If you prefer to do DIY, then check your manual for float height measurement that is required. If all the other possible causes check out and you still have the problem, we recommend that you bring your bike to your expert mechanic for float adjustment. Float height inside the carb for some reason is set incorrectly, causing the carb to flood or lack fuel entirely. This is a common problem in older carburetors, and sometimes with newer ones. If there are blockages, you can use pressurized air to remove them and wash them with gasoline to clean out any remaining residue. Uninstall jets and peep through both of them against the light. Although it isn’t as simple as it looks, where would be the fun in discovering the fix right? Just make sure you follow every step in the book on carburetor assembly. Or, if you are a certified bike head and tinkering is your thing, go ahead and disassemble. For posterity sake, if you suspect a jet problem, you can always take your bike to your expert mechanic for inspection. You can do this fix only if you have some experience with carburetor assembly, or you have the time to study it. Normally a carburetor has two jets, the main jet, and the pilot jet. Don’t forget to look up what type of spark plug is recommended for your engine model. If you haven’t replaced it in quite a while, or maybe you remember that you actually never replaced it yet, do reload a new spark plug and start your engine. Remove the spark plug and clean it using a wire brush. The contact point may also turn overly white which is also another form of residue that is preventing spark. This usually looks like burnt oil and grime. Cause #2: Spark Plug Issue (Carb)ĭepending on the age of your motorcycle, spark plugs may become dirty by way of too much carbon accumulation on its contact point. The goal is to have the correct ratio of fuel to air intake. Again, please refer to your manual and by the way, this process can be done assuming that you have the proper air intake adjustment. Note: This depends on the specs of your motorcycle. The standard number of turns for the fuel screw is 2 and turns. This involves how many turns you have to make off the fuel screw to either limit or increase fuel intake. Refer to your OEM manual, or you can check online and locate the fuel screw on your carburetor where you can adjust it to the required valve opening. Too much fuel floods the carb that prevents proper combustion, which results in no power. Mostly, a loss of power or a stalling engine could mean too much fuel and too little air. Carburetor Type (Possible Causes) Cause #1: Fuel Intake Adjustment (Carb)Ī motorcycle carburetor (just like any) runs on a ratio of fuel vs air intake. Low-Quality Fuel (Injector or carb)Ĭhange fuel brands and use unleaded or premium gasoline with high octane. (link to Amazon) Fuel Filter Clogged (injector or carb) Engine won’t start/or suddenly dies: Assuming that you know all the other parts are okay, suddenly your engine won’t start or it dies in the middle of the ride.Sudden Acceleration: Suddenly your bike accelerates like you are gunning it, and this is without you actually squeezing the throttle.if it’s broken it emits this loud whining sound, and this can happen when you are on the road or when you are on idle. Whining sound from the fuel tank: A normal functioning fuel pump just makes a low hum.This works for both injector type and carb engines. Poor Valve timing Injector Type Fuel Pump not Working (Injector or carb).Float height (needs adjustment) Other possible issues: (carburetor and or injector).Spark plug (either needs replacement or cleaning).Fuel intake adjustment (flooding or too little fuel).
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