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Remove the fuel and vacuum lines from the petcock to the carb. Place a suitable container under the fuel line and draw air on the vacuum line to the petcock (if so equipped) and see how well the gas flows. The flow has to be more than a trickle. It should be steady and fairly substantial. If you get this flow, then you're ok. Run at least a pint of gas through to help flush the system. If you don't get a flow then it's likely your petcock is clogged. You have to remove it to disassemble and clean it. Carefully reinstall it on the gas tank or you could get a gas leak. Reassemble everything and try to start the scooter. It will take several seconds of cranking to get the gas to work its way from the gas tank to the carb. Hopefully it will start now! :>)
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Double check all connections, then crank for 10-15 seconds. Did it start? Do you hear any popping, like the engine is trying to run? Most scooters will not start if you apply throtte while cranking. Honda scooters tend to start easier if you apply throttle just as the engine catches. Most Yamaha scooters will not accept any throttle at all until they warm up a bit. If the scooter catches, but doesn't start, let it rest ~15 seconds before trying again.
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Most scooters need a minimum of 100 psi in compression in order to run start and properly. Compression should be checked when the scooter engine is warm. However, that's hard to do if your scooter is not running. So, just hook up a compression gauge and open up the throttle all the way. Crank the scooter until the needle on the compression gauge stops moving. This should take no more than 5 seconds. Very roughly, 100-125 psi is good, 125-150 psi is very good, and 150+ psi is great. If you don't have this level of compression, then you have bad valves and/or bad piston rings. If you want, you can add a teaspoon or so of oil to the engine through the spark plug hole. Then try the compression test again. If compression is higher, then it's likely you have bad rings. The oil will seal the rings and give you better compression. If compression is the same, then you have bad/misadjusted valves.
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Some 150cc scooter Stories

Bike Asia IntA
l Bicycle and Motorcycle exhibition from April 10-13Online - International News Network, Pakistan - 4 hours agoThe management has approaches us fully knowing PakistanA
s skilled and Bike Accessory Industry. The management ha

Wed, 23 Jan 2008 22:56:13 +0100
Cycle News, GA -(January 21, 2008) A
Imagine a motorcycle that is just as comfortable carving canyons as it is eating up miles of highway and back roads on a long distance ...

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Sci-Fi Scooter/Motorcycle

Wed, 3 Dec 2008 13:38:01 +0200
This looks like the scooter/motorcycle of the future.



LCD screens, lots of lights (used to levitate the contraption?)... Alien UFO or just a plain simple Honda?

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