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How to start an old 150 cc gy6 scooter
The first thing you may need is battery help. If your battery is old it may have lost some capacity and even if it is fully charged it may run down before the scooter starts. It's safe to jump start using the battery in your car, but make sure you don't have the car's engine running.
Don't crank the engine for long periods at a time. Crank for a few seconds, then let things stand for a few seconds, then crank for a few seconds. The starter motor is not intended to be run continuously and if you crank continuously for a minute it may overheat and possibly damage the wiring.

If you drained the fuel and the carburetor, note that many fuel systems require a vacuum to open the fuel supply valve, so you may have to crank for a while to get fuel to flow into the carburetor and fill the bowl before it gets to the engine and the scooter can start. Alternatively you can apply a vacuum to the control port of the fuel valve to allow the carburetor bowl to fill.

If you left fuel in the tank and in the carburetor you may have two problems. The gas may be stale which will make it difficult to start. It may also have gummed up the carburetor which means you'll have to take it apart and clean it. Make sure the jet is clean.

Don't be surprised if you have to crank the engine 5, 10 or even 20 times before it bursts into life. Just take things slow and easy. Starting problems are almost certainly due to carburetor and/or fuel delivery related.

Once the scooter is started and you've made all the safety checks, take it for a 1020 minute ride to make sure it gets fully warmed up. Just starting it up for a minute or two won't get it hot enough to drive off any moisture that's accumulated in the engine and muffler system. You want to get everything up to normal operating temperature for at least 10 minutes.

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