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I have a 1978 rd400. when i turn the engine on, it makes a banging noise when it's idling. But when i start to rev the engine, it goes away....

Any ideas? :O

Thanks :)
 

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Its normal
 

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And Welcome :bigfinger
 

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And :worthless
 

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:stupid
 

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yeah... :worthless
 

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sounds like plston slap. This is usually due to worn plston and bore. As long as the performance is still ok then it should be ok.
 

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a bit more .

2 strokes tend to do the dang-a dang on idle which sounds harsh and banging.

:stupid wot paul says
 
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