2000 YZ426 w/white bros e series...NOISE!?

Get an FMF Q Series. It will pass

I've got a WR400 with the White Bros E series tapered head pipe and muffler. it has always been loud but with great power. I recently restuffed the muffler and added a quiet is cool internal insert. ( www.quietiscool.com ) This insert is similar to the one White Bros sold for a while, but not as restrictive. Additionally, I run 12 discs and I use the White Bros 360° end cap. This end cap shoots the exhaust directly out the back of the bike in a straight direction and away from the DB meter. This alone is good for a couple of DB. A lot of people do not realize that simply deflecting the exhaust away from where the DB meter is held is a big bonus to achieving an acceptable DB meter reading. The bottom line is that the bike is at 96.4DB and the power is awesome. I am going to have the bike tested again soon, as I have put about 500 miles on it since I last restuffed the muffler. Over the years, I have restuffed the muffler numerous times, and I am paying greater attention now more than ever as to how long the stuffing lasts. Hope this helps.

I also have a 2000 426 with white brothers e-series pipe.....I just put a quiet core insert in.....I can tell a difference in the sound....but I have not had it tested yet...I was riding at Stonyfort, here in california, and a ranger pulled me over...he suggested the fmf Q series to me....He said it would make the 426 pass the 96db test.....It might of just been talk on his part, but he seemed to have a pretty good knowledge of combinations that would work...Good luck..

I too have the WB E-Series. I takes 5 or less plates AND the quiet core to get under 96 dB. BTW the quiet core is a POS. A five year old with a welder could make a better "quite core". But it will drop the sound just enough. If you have any fabrication possibilites PM me and I'll send you a pic of the quite core and you can fab one yourself.

BTW the quiet core is a POS. A five year old with a welder could make a better "quite core".
Ever seen the one out of an R4? It's a washer. :mad: :mad:
I've got a WR400 with the White Bros E series tapered head pipe and muffler. it has always been loud but with great power. I recently restuffed the muffler and added a quiet is cool internal insert. ( www.quietiscool.com ) This insert is similar to the one White Bros sold for a while, but not as restrictive. Additionally, I run 12 discs and I use the White Bros 360° end cap. This end cap shoots the exhaust directly out the back of the bike in a straight direction and away from the DB meter. This alone is good for a couple of DB. A lot of people do not realize that simply deflecting the exhaust away from where the DB meter is held is a big bonus to achieving an acceptable DB meter reading. The bottom line is that the bike is at 96.4DB and the power is awesome. I am going to have the bike tested again soon, as I have put about 500 miles on it since I last restuffed the muffler. Over the years, I have restuffed the muffler numerous times, and I am paying greater attention now more than ever as to how long the stuffing lasts. Hope this helps.

DUH . The db meter is held 20 inches away and at a 45 degree angle parellel to the exit of the exhaust. (No matter where the exhaust exits) All they are going to do is move the pickup. If you directed the exhaust straight up, thats where the pickup is going to be moved according to SAE J1287. Look it up. So bottom line--there is no bonus to directing the exhaust anywhere but where it is supposed to be. As a matter of fact if you directed it straight down, the sound will bounce off the ground and you will get a higher reading

when i bought my 426 it came with the e2 and at first i liked the sound, but now its just irritating. for those of you went down to 5 plates and re-jetted, what did you re jet to? also how hard is it to change jets? i have never even removed the carb before.

thanks

anybody?

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