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Got spark? First check for spark. There are a few ways to do this. The easiest way is to remove the spark plug and put it back in the spark plug cap. Then ground it to the engine - you should be able to lay it against a non-painted portion of the engine. Make sure there is good metal-to-metal contact. In a semi darkened area, attempt to start the scooter. You should see a definite spark at the tip of the spark plug. It's hard to see in direct light. If the color of the spark is blue, that means it's a strong spark. A white color is less strong, and a yellow color is weak. Most scooter starting systems are a bit weak (compared to cars). Even a yellow spark should start your scooter just fine. Next, the spark must occur at the right time. Just about all scooters made since around 1980 have electonic ignition. These systems rarely can be set. This is good news. After working on maybe 50 scooters, I've never seen one go out of time. Scooters with points are another matter. You'll have to follow the timing procedure in the manual to get the timing correct. In general, the spark occurs just before the piston reaches the top of it's stroke. There is a slight delay between the spark plug fire and the fuel-air mixture ignition. That's why the spark occurs a little early. Most ignition systems have an advance unit build in, so that as the engine speeds up the time of the spark retards a little bit and helps the engine fire the mixture at the proper time.
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Fuel/Air Mixture. The next thing to check is your fuel/air mixture. You could be getting too much or too little of either. If your scooter has been sitting for a while, it's likely that the gas has evaporated and left a bunch of sludgy deposits. If it's been more than 3 months, you should clean out the fuel system and the carb.
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Try to buy a scooter performance kit (carb, air box, exhaust pipe) that is tuned for your scooter. It will make things much easier. Lastly, add the big bore kit. This will give you more torque (pulling power) and better acceleration. It won't necessarily add top speed unless you make gearing changes too. For larger scooters, there aren't too many performance parts available here in the U.S. The easiest thing is to do a web search for "scooter performance parts" and see what you can find.
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