Blocked carb jets – remove and clean carb.Cold ambient temperatures or higher altitudes – adjust mix.Here’s a list of the more common ones and the fix: The causes of a lean engine are just as varied. Symptoms of a lean engine vary by how lean it’s running, but here are a few of the more common ones: Or another way to look at this situation – the engine is getting too much air. When your engine isn’t receiving enough gas in proportion to air, it’s known as running lean.
The answers to the above questions will put you on the correct path. It never hurts to remove and clean your carburetor thoroughly. You should also know that clogged carburetor jets cause the most running issues. Have you made any mods like a bigger air filter or exhaust or a change in altitude or temperature? These types of changes will require a fuel adjustment and possibly a re-jetting of the carburetor.Īll diagnoses should begin with fresh gas in the tank and a clean air filter. What’s the spark plug condition? A black plug indicates a rich running engine, and a grey/white plug indicates a lean condition. You’ll need to remove and clean your carburetor. Question 4:ĭoes your engine die if you open the throttle both quickly and slowly? If it does, your main jet may be clogged. See adjusting the accelerator pump below. Question 3:ĭoes the engine only die if you open the throttle quickly? If it does, your accelerator pump may need attention. Question 2:ĭoes removing the air filter help? If it does, your engine is running rich. Question 1:ĭoes your condition improve if you apply the choke lever? If it does, you have a lean condition. In most cases cleaning the main jet will fix your problem, that said it won’t hurt to run a few quick tests first to help confirm our suspicions. As you’ll learn, lots of things affect the AFR, most can be controlled by the rider, but some can’t. This is the optimum ratio and is known as “Stoichiometric.” When a technician tunes your carburetor, this is the ratio they are chasing. Gas engines like to run with an air-fuel ratio (AFR) of 14.7 parts air to one part gas.
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