johns workers Posted March 11, 2013 Report Share Posted March 11, 2013 hi my beta evo 300 4t is spitting and banging in the rear exaust box i have dried out the cdi unit checked the inlet rubber and found that it had come of so put this back on but the engine is still spitting and back fireing can any one out there help many thanks john Quote Link to comment Share on other sites More sharing options...
slickgolf_0 Posted March 11, 2013 Report Share Posted March 11, 2013 Hi Check the CDI block connector , look for corrosion evidence on any of the connections (green colour) If its not that , try a new spark plug . Quote Link to comment Share on other sites More sharing options...
benbeta23 Posted March 11, 2013 Report Share Posted March 11, 2013 The main problem that causes this is the CDI unit, You need to check the terminals for any green colour what so ever. On our Beta Evo 4t's we have moved the CDI further up near to the kickstart, To stop water getting into it as easy. Also is worth taping it around the connecter. Failing that another problem can be a tiny bit of water in the carb, you need to undo the drain bolt slightly at the bottom of the carb, It is a bit funny to get to with the exhaust being in the way, But give it a go, Might just be the problem. Quote Link to comment Share on other sites More sharing options...
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