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Rejetting

If you replace your stock exhaust, you change the quality of the air/gas mixture. In some cases you need to rejet the carburetor, in some cases recarbing is an adequate solution. After replace the exhaust, the easyest way to know what to do is to ride 0.5-1 mile with 3/4 throttle. If it backfires, then you surely need to rejet. After stop the engine, look at the spark plugs. The color of the electrodes will say you what's going on: if it's wet and dark, your mixture is too rich, if it's dry and white/light gray then the mixture contains too few fuel. If you can recarb it, then it's a good solution, if no, you must rejet. If the color of the electrodes is brown/dark brown, then you're on the right way. To play safe, take a gas-analyzer or call for a specialist!
 
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