rubber glued to engine cover works!

You don't glue anything in. Just cut little short pieces of tube and stuff it in between the fins. I can't remember for sure but I think I put six in mine and they are all still there......................

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Going back to the original thread, was the rubber mat like a car floor mat? I was thinking of using a softer rubber like whats used in computer mouse pads. What kind of glue? Maybe some kind of contact cement?

66

Hey cruiser, I think the mouse pad would be OK. I took the easy way out and used a roofing product. I don't know what it is called but I think it's for the edge of your roof and goes under your shingles. It has it's own glue and you just peel off the wax paper and stick it on just like you would with a decal. To be honest, I would like to go thicker and am thinking "1/2 inch thick mud flap off of the rear of a transport truck. I would try contact cement to hold it on.
I went out for another ride last night and was so amazed at how this mod helps. I guess it's like holding your hand on a bell, it stops the ringing!

cool. amazes me such a small modification to a bicycle engine can do so much

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If you have any old 7mm plug wire,it works pretty good.Cut 1/2" or less pieces and jam between every other fin.Ron

Thanks for the info. I'm familiar with that roofing product and the glue will work good with the high heat from the engine. The heavier density of the roofing stuff might be better for sound deadening than the mouse pad material. The mud flap is also a good idea too if you can get it to stick on. It will be interesting to see how well contact cement works...

66

That may work O.K., but you are better off with a softer material.

The BEST sound deadener? Lead.

Next best, but probably not suitable? Sound deadener like they use in auto doors- looks and feels like a sticky clay.

For our bikes, I'd recommend a thick, dense rubber, but not too hard a compound.

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Kinda like this right?

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Ghost0,

That looks factory. Nice neat job! What did you use and how well does it work?

66

Just used some rubberized plastic that I had laying around. It is about 1/8" thick and does an excellent job. Like was mentioned earlier, any rubberized plastic will work. What I mean by rubberized is that it is not brittle. Acrylic won't work, too brittle and sounds like glass. You want something that sounds more like a tire when you tap it.