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Bing carburettor on Casal Boss 49cc. Will only develop enough power to run up hill if the air filter unit is removed, but makes too much ( illegal !) throaty noise when it is. It also takes time to reach the speed positions twisted on the throttle with or without the air filter. When mobile, engine speed is erratic with hand kept still on the throttle control. A new carb is called for, but I'd like to hear and try members suggestions both to understand what the problem is and to save money. Thanks.

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It sounds like it needs a new needle and seet for the carby so if you take it to a biks specialist they may be able to help. also in your usermanial there shald be info on how to maintane it

Posted on Jan 12, 2014

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SOURCE: 2003 yzf450 wont run right?

recheck pilot jet & pilot circuit.also check compression

Posted on Feb 16, 2009

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