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the sym scooter is shown as a oil in the sump requirement with a dipstick to check oil level
that will mean that only straight 91 octane fuel is put in the tank
go google and type in--sym 50cc motor scooter user manual -- and there is a page with a pdf version download of all the required knowledge for the scooter
the site is --www.49 ccscoot.com
Lightly seat both screws then open each of them one and one half turns. This is the factory setting for Japanese bikes. Clean the air filter, install a new spark plug, I assume the Sym has a two stroke engine, mix the gas ans oil 32 to 1. That equals 4 ounces of two stroke engine oil per gallon of gas. NEVER use motor oil, only two stroke engine oil. Also, tighten all carb fittings such as mount bolts and clamps. Replace any rubber fittings if you see cracks. A cracked manifold will let air into the mixture which leans the mix and makes the idle rev upward.
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