Catalog
Parts views
Technical documents
Ask for a quote
Return request
The first rule in marine maintenance is not to rely only on the horsepower shown on the cowling. To identify a carburettor body or overhaul kit, note the exact model code and year from the identification plate located on your engine bracket. From one generation to the next, jet calibrations change to meet standards or adjust torque. Two engines with the same displacement therefore do not necessarily share the same carburettor.
A specific feature of Yamaha outboards is that many multi-cylinder engines are fitted with a bank containing one carburettor per cylinder. This has two consequences when ordering:
Using OEM references or high-quality aftermarket parts remains the best guarantee against air leaks and carburation faults. In our catalogue, you will find carburettors that meet Yamaha standards.
Mercury - Yamaha 20-50hp carburetor enricher.
Pièce non en stock.
Demandez le délai de réapprovisionnement et le tarif en cliquant sur le bouton « Ask for a quote ».
Un conseiller traitera votre demande dans la journée.
Mercury - Yamaha carburetor enricher.
Enrichisseur de carburateur Mercury - Yamaha.
The rule is simple: one kit per carburettor. Check the number of carburettor bodies under your cowling before confirming your order to avoid unpleasant surprises during assembly.
At the end of the season, you have two options: add a fuel stabiliser to your tank and run the engine to treat the circuit, or fully drain the carburettor bowls. Avoid leaving unstabilised fuel sitting in your carburettors for several months.
On a marine engine, most carburation problems come from fuel degradation, which leaves varnish deposits, or from corrosion. Before dismantling everything, symptom analysis helps determine whether simple cleaning is enough or whether an overhaul kit is required.
This is the most common fault, often caused by fuel ageing, especially unleaded E10, during winter storage.
The needle valve regulates the fuel level in the float bowl. If it no longer closes correctly, fuel overflows. The signs are clear: the engine floods, there is a strong smell of petrol, and the spark plugs are black and wet. If the rubber-tipped needle shows a wear mark, replacing it with a carburettor kit is essential.
The carburettor depends directly on its surrounding components. Working on it without checking the rest of the fuel circuit limits the effectiveness of your repair.
Check the condition of your primer bulb and hoses. Above all, inspect your water-separating filter: water is the first enemy of your injection or carburation system. Regular filter replacement protects your carburettors over the long term.
An air leak between the carburettor and the intake manifold leans out the mixture, raises idle speed and makes the engine run hot. Whenever the carburettor is removed, replacing the base gasket is strongly recommended. Respect the tightening torques so that the mounting flange is not warped. Do not forget to reinstall the thermal spacers: they prevent heat from the engine block from boiling the petrol in the bowl.
Although the principle remains the same, tolerances and maintenance methods differ according to the cycle of your Yamaha engine.
To meet anti-pollution standards, 4-stroke engines are set very lean. The mixture screw setting is extremely precise. These carburettors often include an accelerator pump to provide clean acceleration. On multi-cylinder 4-strokes, such as F50 or F100 engines, synchronising the bank with a vacuum gauge after reassembly is essential to ensure steady idle.
The design is simpler, but synchronisation remains essential on engines with several carburettors. On a 2-stroke engine, mechanical synchronisation is most often performed by aligning the simultaneous opening of the throttle butterflies. A single misadjusted carburettor unbalances the entire block.
Exploded views
Honda Marine
