rubber gizmos in cooling fins on air foolers

[crackshot]

Are they needed? To me they block the air flow. Mine are missing and i think they are for vibration.

[toki]

yup. for vibration

[Toaster556]

The rubber blocks in two stroke air cooled cylinders are to cut down on noise. I didn't have any in a 84 Husqvarna 500XC, and it took a short 20 mile ride to convince me I needed them. Sometimes at night, I still hear the fins ringing...
The air blockage is minimal at best, as is the noise reduction.

[crackshot]

So where do you get replacement ones?

[fabiodriven]

I'm guessing they're no longer available OEM? I'd try an air cooled bike that was made recently like a YZ490 or a Blaster or something like that. They may still be available from the dealer and Yamaha seems to keep old parts around a lot longer than Kawi and Honda.

[crackshot]

Are they really needed? Would not seem like they would make that much of a difference.

[greenhuman]

Noise reduction. Terrible without them. I know as I removed mine back in the day and could not put them back quick enough.

[Red Rider]

Sometimes at night, I still hear the fins ringing...

Dat's funny right der.