09 YZ450F STK exhuast

26 replies to this topic
  • blakers213

Posted February 22, 2011 - 06:13 AM


Rivet gun.

  • wags450

Posted February 22, 2011 - 03:41 PM


had some time to today to modify the stk muffler that was on my 450F.
i drilled out the rivets and removed the "perferated cones" from within the muffler. repacked, reassembled and resealed the muffler.

the muffler is definetly louder LOL. seems to rev a bit more freely. haven't ridden it yet to see if any low end power was obtained.

anyone have any info / experience they could share with a mod like this?

thx :smirk:

I did the same thing accept I put a screen in there to count as a spark arrestor. i know its no a USFS approved one but I havent had an issue and I get checked atleast 2-3 times a ride by the San Bernadino National Forest patrols and rangers everytime I go riding up there.

Bike runs great and actually has less popping than before

  • wags450

Posted February 22, 2011 - 03:43 PM


What did you guys use to button the exhaust back up?

3/8 rivots from Home Depot $5

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

Posted February 22, 2011 - 05:54 PM


3/8 rivots from Home Depot $5

Cool, thats what I was thinking but I wanted to be able to open it up again without drilling again. Thanks for getting back to me

  • grayracer513

Posted February 22, 2011 - 06:48 PM


3/8 rivots from Home Depot $5

I really hope you meant 3/16" rivets...:smirk:

  • wags450

Posted February 23, 2011 - 07:30 AM


I really hope you meant 3/16" rivets...:smirk:

My bad good catch. Yes 3/16" rivets.


If you dont want to drill out you can always get a tap and put screws in it. Only problem is they will probably work loose

  • grayracer513

Posted February 23, 2011 - 07:38 AM


The trouble with threaded screws is that there is only the thickness of the sheet metal to tap into, and the just don't hold for very long. One of the things I like about mufflers like the DRD is that they have blind nuts welded in place and are assembled with screws rather than rivets.

Related Content


Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

yz400f throttle bog by yz400fmaniac

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • * * * * *
  • Hot  28 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.