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Trees4Traction

How do you quiet a yz 450 to 94 db or lower

8 posts in this topic

I live in michigan and ride pretty much all single track. I joined the CCC this year and did the atlanta ride. I didn't even get checked for sound they saw that I had a pro moto spark arestor and silencer. When I rode the color tour this weekend they would not let me ride because at an idel the DNR officer gaged me between 94.7db and 94.9db and 1/8 throttle the gaged me at @101db this is a problem. Pro moto has there sprk arrestor and silencer rated at between 94 - 96db this is not true. I have been searching on how to get the bike quieter but not lose its power without spending a whole lot of money. Does anybody have any ideas or has anybody be able to quiet the beast. I want to ride the rites of spring in March but wont be able to do this leagally if it is not quiet.

P.S. I called Pro Moto and they said they have no problem passing in Calf. and there tech is supposed to getting back with me.

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I got mine tested at 99db with the PMB silent core, I ended up buying a FMF Q and it tested at 96db. I have no idea how to get to 94?

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The only SURE way to get the bike to 94 is to buy a fully choke WR pipe. The drawbacks are obvious though. Another option though I have not seen real results is to buy a CRD Absolute Performance silencer. Supposedly 92 db or some such thing. I like my Absolute Power compared to my ole R4 but that isn't saying much. :cry:

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Install a FMF Q muffler and WR throttle stop.

You can also try to make a "lid" for the airbox as that will quiet (restrict) things.

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europe is governed by the FIM and we are by the AMA

they ,the FIM, have stricter guidelines on exhaust noise

you might check into some of their systems

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