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I have the valve cover off my 400T to clean it up (pretty nasty looking) and noticed foam spacers between the fins. What's the purpose of these? I'll be removing them to clean everything but is there a need to put them back? Here's a pic:



Thanks
 

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reduces fin ringing noise (dampeners), a lot more common on two strokes
 

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*edit* Ahh... beaten to the punch yet again... :mrgreen:


Without them, the fins can set up a 'ringing'. The foam blocks stop that from happening.

Before you remove them for cleaning, tap the fins with a light wrench or something. You'll notice the sound is a dull 'clack'. With the spacers removed, if you give them a light tap, they'll give more of a ring. Louder and longer.

So, the foam just quiets things down when the engine's running.

Many engines have them, particularly two-strokes. My Hodaka 250 I'm resurrecting has a whole collection between virtually every fin on the head and cylinder. Mine are stiff rubber blocks, though, not foam.



 
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