Topic: cylinder fin rubber seperators- what are they for?

[greasy j]

any one know what these do exactly? I know I've seen lots of engines without them, so they can't be super critical. these came stock, right?

if they are helpful somehow, anyone know of a good easy replacement. I could get a bunch of pencil erasers and cut nipple shapes in them.

I'm sure they'll be left out of the rebuild, though. unless you guys can give me a reason...

[plastikjock]

I think it's to absorb noise, sure I read it some where.

 

[Markcb750]

they dampen vibrations from the engine movements reducing the tuning fork effect of the fins.

Could just be Honda did not want the motor to sound like Yamaha's logo...

[Alan F.]

OK, here's my thread hijack question, is there something one can use in place of these dampeners if you haven't got them? They're almost $5 each new....

[Markcb750]

Not speaking from experience but something like this; Viton Oring material,  might work well. *400 Deg F 


The adhesive would be important.  O ring materials respond well to Cyanoacrylate based glues, but how well it would bond to the aluminum would need testing.

[Alan F.]

Possibly something like these 5/16 Fluoroelastomer Rubber Balls: http://www.smallparts.com/Minnesota-Rubber-514AD-Fluoroelastomer-Balls/dp/B000FMUJXQ?ie=UTF8&qid=1269823491&sr=1-26&pf_rd_r=1VA4JZAWNXXCA6HPXNSJ&pf_rd_m=A2LPUKX2E7NPQV&pf_rd_t=101&pf_rd_i=350666011&pf_rd_p=493388231&pf_rd_s=center-3


Or these 5/16 EPDM Rubber Balls, but I'm not sure if a max of 220 degrees F will be good enough... but they do come in a pack of 10
http://www.smallparts.com/Minnesota-Rubber-559PE-Balls-003/dp/B00137WRIC?ie=UTF8&qid=1269823615&sr=1-21&pf_rd_r=1SWEEGXA27XJP2F8TDRQ&pf_rd_m=A2LPUKX2E7NPQV&pf_rd_t=101&pf_rd_i=350666011&pf_rd_p=493388231&pf_rd_s=center-3

[Brown Bomber]

Erasers sound like a good idea, if they can handle the heat.

[Alan F.]

Yeah I'd worry about regular pink rubber erasers being up to the task, let alone staying in place, they'd probably melt into a stinky gooey mess.

[greasy j]

I think you're right. that was just kind of a joke. although the ones I took off were very soft, almost gooey, or else hardened in parts.

how many people are going without them and does it sound cool?

[Alan F.]

I dunno, mine came out all gooey and swelled up.  I think it was the gasket remover spray that did them in.  I have another block somewhere I could scavenge them from but I doubt they're much better than the ones that rolled under my bench last year...

[City Boy]

Hi greasy.Unless you wish to have the rubber inserts in place for original asthetics,you need not worry about installing new ones.No harm will befall your ears.   Rock On

[754]

I have seen them years ago in gasket sets..

 Maybe Ibco or Vesrah..

 I have a 70 ish hexed 750 head  and barrel, someone drilled thru the fins, tapped them and put 1/4 inch setscrews thu the fins.. .... anyone ever see THAT..??

[City Boy]

Hi 754.Why the hell they do that?    Rock On

[bryanj]

Youre right you used to get them in the Vesrah sets but not any more i think

[greasy j]

thanks you guys! still the best site ever.

[mystic_1]

The cylinder fin rubber separators are designed to allow you to rapidly drain your wallet during a rebuild.

  

mystic_1