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JRAMBO

WR 426 Noise in dbs

10 posts in this topic

I took my bike(02 WR 426) with a full white Bros. exhaust yesterday to the bushwackers race at praire city to have it sound tested so I can race it in san jose at metcalf in 2 weeks.Well I took out as many discs as possible down to 4 and the quiet core it registered 102 on the db meter .The guy told me this is the hardest bike to keep quiet him and his friend worked like 2 months on one to get to 96 dbs.I guess what I want to know is?Does any body have a 426 that they have at 96dbs what pipe and how does it run still run as good if jetted right. :banghead: I just would like to race it in the cross country class if possible. Thanks Jeff

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I run the stock pipe. I have no idea what my jetting is.

I removed the stock baffle and put in a "Quite-is-cool" tip.

Last race I tested at around 90 to 92db.

Good product, easy to install and my bike actually runs better with this tip than it does uncorked. :banghead:

Here is a link to their website: http://www.quietiscool.com/

Quiet002a.JPG

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These guys also make a shield that fits over the E-series discs. It's on their website.

I have an E-Series on my WR400. I run 10 discs with the quiet insert and the Quietiscool shield. The bike still does not come anywhere near 96 dB.

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I had a WR426, it has the vortip and I also used the GTYR, the GTYR was at 93 db, the vortip was 91. I now have a WR450, FMF Powercore4 witht he quiet core insert and it runs 94 db. Powercore4 without the quiet core is over 100db.

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I had a WR426, it has the vortip and I also used the GTYR, the GTYR was at 93 db, the vortip was 91. I now have a WR450, FMF Powercore4 witht he quiet core insert and it runs 94 db. Powercore4 without the quiet core is over 100db.

How much of a power loss do you experience with the quiet core.

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FMF Q - I have a 450 that I run with stock header and stock jetting, I registered 92 at a race last weekend. My buddy has a 426 with the power bomb header, (he plays around with his jetting), but it is equally as quite as mine. Performance wise? I manage to eat the orange 450's all day long and I can run with YZ's and other WR's that are louder than mine no problem. I've heard alot of smack talk about the Q's but I have been extremely happy with mine for two years. I have a 99 WR 400 with the E-Series pipe and I have the same problem, I am down to 6 discs and it's still to loud. Try re-packing........

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Ya I tried to repack it and tryed the Q insert and four discs and still 102dbs so I am going to try the new E-2 its a lot longer that my other pipe so hopefully I will be racing next weekend We will see thanks for all the help its nice to see you can get the dbs down on these bikes.

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How much of a power loss do you experience with the quiet core.

Not sure, I have never ran the Powercore without the quiet core insert. I installed the powercore and insert all at once and over stock, huge improvement. It has a nice sound, throaty, "commands respect" type of sound. :banghead: You know the sound, the type that makes other riders pull over and let you through.

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