How do you adjust a carburetor on a 50cc moped?
With the engine idling, turn the idle mixture screw clockwise in ¼ turn increments until the engine drops in speed. Count how many turns this takes. Turn the screw counter clockwise in ¼ turn increments until the engine revs back up and drops again. Count how many turns this takes.
Why does my Vespa keeps cutting out?
Vespa will cut out due to low cylinder compression. If your Vespa still keeps cutting out after checking the fuel, spark plug and carburetor then the problem can be the valve (as mentioned) or the compression of your cylinder. You need to remove the cylinder to check if the piston, rings, and cylinder walls are ok.
Does a Vespa have a choke?
Vespas use a manual choke system to help with cold weather starting. Once your Vespa sputters to life, it will run fine. However, getting it started can be a challenge. In reality, each scooter, choke and carburetor are a little different, so what works on one scooter might not work on another.
How do you adjust the carburetor air fuel mixture on a scooter?
It shouldn’t need much adjustment, but the way to do it is to turn the screw very slightly (1/8th turn) and see if the idle speed goes up or down. If it goes down, turn the screw back 1/8th turn to where it started, then 1/8 turn in the other direction and see if the idle speed goes up or down.
Why is my Vespa not starting?
A dirty or old spark plug might be the cause of your Vespa not starting. While you might have a spark, it might not be enough for the engine to start. Clean the existing spark plug or replace it with a new one.
What fuel does a Vespa use?
unleaded petrol
Piaggio, Vespa and Gilera scooters use unleaded petrol, with a minimum of 95-octane. For pre-1992 models we recommend that you consult the vehicle manual or consult your nearest dealer.
How do I adjust the idle speed of my carburetor?
For example, in a higher altitude there is less air for your motor and the fuel-to-air mixture will be richer. Thus, your carburetor will need to be adjusted to accomodate less air in the atmosphere. Adjust the idle speed by locating the small spring-loaded screw which is usually located next to the throttle control.
How long to drive before adjusting carburetor settings?
As a general rule this base line setting show be working ok. However, in order to get the best out of the carb and to adjust the settings 100% correctly one should drive now for some kilometers and afterwards have a closer look at the spark plug condition. The condition of the spark plug will exactely tell you how well setup your carb actually is.
What factors affect the performance of a carburetor?
Whether it is a stock or aftermarket carburetor, you will need to consider the temperature, altitude and humidity as these can have an effect on how well it is set up. These environmental factors determine how the fuel-to-air mixture runs through the carburetor.
How do you adjust the fuel to air ratio on a carburetor?
Adjust the fuel-to-air ratio (FTA) by locating the slotted idle mixture screw near the air-cleaner side of the carburetor. With the engine off, turn the screw all the way in counting the number of turns it takes. This is your baseline, if you are not happy with the adjustments.