Racing AMRA: Need a spark arrestor/new exhaust?


6 replies to this topic
  • Streamline

Posted October 27, 2010 - 09:34 PM

#1

I recently joined the AMRA and I need to get a spark arrestor to be legal and to be able to meet the 96db limits. What is the best/easiest/least expensive option in doing so? I have a 04 YZ450F with the stock exhaust, other than a FMF Power Bomb.

Thanks for the help,
Tyler
#29P

  • WB450

Posted October 28, 2010 - 07:20 AM

#2

This is the way I went, works great.

http://www.promotobi.../cPath/46_48_39

  • YamaLink

Posted October 28, 2010 - 07:54 AM

#3

Pro Moto Billet is a win-win option!

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Streamline

Posted October 28, 2010 - 03:25 PM

#4

I've read up on the PMB and most say they couldn't pass the 96db levels when they were tested?

  • dbreezy81

Posted October 29, 2010 - 06:13 AM

#5

I have raced AMRA and they aren't super strict on the sound requirement. Just need to make sure you have a spark arrestor. When I raced I used the PMB insert on my 07 exhaust and I passed tech no problem.

  • Bsmooth

Posted November 09, 2010 - 01:52 PM

#6

AMRA failed my freshly packed pro-circut t-4 system with a spark arrestor in. 112 decibels at idle. I had to stuff a couple rags in there to make it quieter but still didn't pass. Any cheap and easy ideas as to quiet down this beast?

  • Jim813

Posted November 10, 2010 - 10:02 AM

#7

AMRA failed my freshly packed pro-circut t-4 system with a spark arrestor in. 112 decibels at idle. I had to stuff a couple rags in there to make it quieter but still didn't pass. Any cheap and easy ideas as to quiet down this beast?


Do they make a quiet insert. If not, I think your best bet would be selling the Pro-Circuit for a quieter exhaust such as the Leo-Vince.





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