I love my YZ450F


24 replies to this topic
  • DrNation86

Posted April 01, 2013 - 03:55 PM

#1

I have a 04 with Marshalls Racing Suspension, FMF PowerCore 4.1 With PowerBomb Headpipe, DNA Racing WheelsImageUploadedByThumper Talk1364860504.234621.jpg

  • f150jokerstyle

Posted April 01, 2013 - 04:54 PM

#2

Purdy!

  • kiessel24

Posted April 01, 2013 - 05:28 PM

#3

How do you like the 4.1? Is it loud?

  • DMC707

Posted April 01, 2013 - 08:19 PM

#4

Another Okie --- cool ! nice lookin bike

  • FinchFan194

Posted April 01, 2013 - 08:29 PM

#5

I loved my 04, the perfect gear box/engine power delivery IMO.

  • yz133rider

Posted April 01, 2013 - 08:46 PM

#6

Ive been considering polishing my engine covers lately and seeing yours sealed the deal for me. Busting out the sand paper!

  • DrNation86

Posted April 02, 2013 - 05:10 AM

#7

The 4.1 sounds great. Not too loud. Thanks for the comments it was just a random thought of the day i decided to post lol

  • gunnin88

Posted April 02, 2013 - 08:30 AM

#8

I run the 4.1 on my 2010 and it's very loud. people do not like to ride behind me.

  • kiessel24

Posted April 02, 2013 - 09:01 AM

#9

You running it with the spark arrestor?

  • slothman

Posted April 02, 2013 - 10:27 AM

#10

Ive been considering polishing my engine covers lately and seeing yours sealed the deal for me. Busting out the sand paper!


agreed !

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  • DrNation86

Posted April 02, 2013 - 11:36 AM

#11

No spark arrestor

  • gunnin88

Posted April 03, 2013 - 12:16 PM

#12

You running it with the spark arrestor?


yes arrestor did not make any noticable diffrence.

  • kiessel24

Posted April 03, 2013 - 12:18 PM

#13

yes arrestor did not make any noticable diffrence.


I just ordered the 4.1 along with the quite insert. It says it'll lower it to around 94db. So we'll see how it performs

Edited by kiessel24, April 04, 2013 - 11:18 AM.


  • f150jokerstyle

Posted April 03, 2013 - 03:03 PM

#14

I just ordered the 4.1 along with the quiet insert. It says it'll lower it to around 94db. So we'll see how it performs


I have the ti 4 muffler and with the quite core in it it still blows around 98db. mine is a 03 the older 450's were simply not built with noise in mind I think. I'v heard the mega bomb helps 1 or 2db but i'm running the stock one.

  • kiessel24

Posted April 03, 2013 - 03:05 PM

#15

I have the ti 4 muffler and with the quite core in it it still blows around 98db. mine is a 03 the older 450's were simply not built with noise in mind I think. I'v heard the mega bomb helps 1 or 2db but i'm running the stock one.


I have a 2010 and can't afford a whole new system yet but eventually I'll get a new header too.

  • f150jokerstyle

Posted April 03, 2013 - 03:07 PM

#16

I have a 2010 and can't afford a whole new system yet but eventually I'll get a new header too.


You should be good then I think FMF's data is based off the newer bikes. Also i'v read on here the stock header on your bike is pretty darn good if I remember right.

  • kiessel24

Posted April 03, 2013 - 03:13 PM

#17

You should be good then I think FMF's data is based off the newer bikes. Also i'v read on here the stock header on your bike is pretty darn good if I remember right.


Yeah I heard something like that too. Once I get it ill let you guys know how it performs.

  • gunnin88

Posted April 04, 2013 - 09:59 AM

#18

the quite core robs big HP from what I understand. I ride Tahuya national forest and have been checked by DNR guys before they have never mentioned that my bike was to loud but I'm also tail riding so it's not getting opened up all that much.

  • kiessel24

Posted April 04, 2013 - 11:17 AM

#19

the quite core robs big HP from what I understand. I ride Tahuya national forest and have been checked by DNR guys before they have never mentioned that my bike was to loud but I'm also tail riding so it's not getting opened up all that much.


The insert that comes with my exhaust is both the spark arrestor and quite core. It's all one piece so I don't really have a choice.

Edited by kiessel24, April 04, 2013 - 11:17 AM.


  • gunnin88

Posted April 04, 2013 - 11:29 AM

#20

they sell just a spark arrestor, its what I bought I think it was 28 bucks, I'll find a link

Edited by gunnin88, April 04, 2013 - 11:34 AM.






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