dual mufflers on 400


18 replies to this topic
  • rmx250rider

Posted July 27, 2009 - 07:35 PM

#1

I seen on another persons bike, he had duals, they were FMF factory 4.1
how would i try to atempt this project.

I have a 98 yz400f with the 2005 450f conversion

  • KJ790

Posted July 27, 2009 - 07:38 PM

#2

I seen on another persons bike, he had duals, they were FMF factory 4.1
how would i try to atempt this project.

I have a 98 yz400f with the 2005 450f conversion


Was the other bike a Honda by any chance?

  • grayracer513

Posted July 27, 2009 - 07:44 PM

#3

how would i try to atempt this project.

My advice would be not to, but if you insist, your exhaust fabrication skills will be at a premium.

  • ben_suhard

Posted July 27, 2009 - 07:44 PM

#4

Why do you want to do that? It'll probably just add weight, if you can even buy a dual for your bike, which I doubt. As mentioned above, it was probably a CRF250, they come standard with duals aswell. Honda did it to try to get noise levels down. Worth noting, is that the 2010 CRF250 has a single. http://www.motocross...314FAD84EE6F221

  • rmx250rider

Posted July 27, 2009 - 07:45 PM

#5



  • grayracer513

Posted July 27, 2009 - 07:46 PM

#6

Honda did it to try to get noise levels down.

It didn't really work, either.

  • ben_suhard

Posted July 27, 2009 - 07:50 PM

#7

Interesting, I've never seen that on a YZ before! Even the race teams run singles on their CRF250's..

  • Family Man

Posted July 27, 2009 - 11:19 PM

#8

funny honda clamed it help with the handling of the bike aswell.

  • ben_suhard

Posted July 28, 2009 - 12:15 AM

#9

funny honda clamed it help with the handling of the bike aswell.

Actually, it could have improved the handling because it would get the weight closer to the centre of the bike. But if it added weight aswell, depending on how much, it could have been counter productive.

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  • grayracer513

Posted July 28, 2009 - 06:40 AM

#10

funny honda clamed it help with the handling of the bike aswell.

Apparently not enough to keep using it, or expand its use to the 450's. It's a waste of time, energy, and money, if you ask me.

  • cowboyona426

Posted July 28, 2009 - 06:43 AM

#11

Duals... great on a V8 or twin cylinder street bike, not on a single cylinder dirt bike.

  • CountryboyMX720

Posted July 28, 2009 - 06:44 AM

#12

funny honda clamed it help with the handling of the bike aswell.


Yeah and with the new single there saying that too


But IMO, the duals look good. But my opinion may be biased cause i have them. :worthy:

  • Ga426owner

Posted July 28, 2009 - 07:29 AM

#13

I seen on another persons bike, he had duals, they were FMF factory 4.1
how would i try to atempt this project.

I have a 98 yz400f with the 2005 450f conversion



well get your pipe, a pipe bender, and your welder and a whole bunch of $$$ for two mufflers.....good luck and please tell us what the objective is for this project?
the look, the noise or the fun of welding? :worthy:

  • yamahammer426

Posted July 28, 2009 - 08:22 AM

#14

I can't see why the time and effort put into the project would be proportional to the gain from doing such a thing. You'd need the other muffler, a way to connect from the header or midpipe on the right side of the bike to the other muffler, you'd have to fabricate mounts for the midpipe and muffler on the left side of the bike, and you'd need to make enough space between the left number plate and the frame to allow the muffler to mount and clear the number plate. And, most importantly, you'd need the time and ability to make all that come together.

  • rmx250rider

Posted July 28, 2009 - 03:06 PM

#15

[quote name='yamahammer426']I can't see why the time and effort put into the project would be proportional to the gain from doing such a thing.]

For the look, and I got plenty of welding experience, plus it will be the only YZ400F out there with duals( that we know of)

idk either I will go with the Factory 4.1 pipes
or get the stock 2009 YZ450f pipes

I like to make things different, go against the crowd.

I have already started this project, so I will post update pics when I can

  • ben_suhard

Posted July 28, 2009 - 09:52 PM

#16

idk either I will go with the Factory 4.1 pipes
or get the stock 2009 YZ450f pipes

The 09 YZ450F has duals??? Don't use a stock 09 YZ450 muffler, they're restrictive and heavy with those cones inside.

  • rmx250rider

Posted July 29, 2009 - 08:02 AM

#17

no, I was either going to buy (2) stock 09 450 pipes, or buy (2) factory 4.1

  • CountryboyMX720

Posted July 29, 2009 - 08:17 AM

#18

What about using 250r silencers? Not sure if the diameter of the pipe would work, but still, its a idea.

  • rmx250rider

Posted July 30, 2009 - 12:59 PM

#19

Im getting my friends duals off his 250R so I hope it works out that way if not, im going to buy some SS pipe and go frome there





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