Sign in to follow this  
Followers 0
Menzies450

what Muffler to get for 2009 yz 450

10 posts in this topic

is there a big difference in either of theses Mufflers if so whats the best one to get

1. Factory 4.1

2. Powercore 4 HEX

3. Q4 Hex

4. Powercore 4

 

and also does it natter what header I get

 

the mega ,Power ect....

Share this post


Link to post
Share on other sites

The Factory 4.1 is going to be loud, I installed it on my 10' 450 and it seemed open the bike up on the bottom end. With the stock exhaust it seemed to be corked up. I tried the Q4 before the the 4.1 and the Q4 is going to be more for off-road use, because it's not as loud(we all know that keeping sound levels low will help keep our trails open). Personally I felt like the Q4 corked the bike up more than stock. But that's my personal opinion.

Share this post


Link to post
Share on other sites

I also heard the Powercore 4 is very loud. The new HEX design is supposed to lower sound levels, I haven't tried any of the HEX mufflers so I can't comment on those

Share this post


Link to post
Share on other sites

I have had the Q4 and P4, the P4 was better

My new bike came with a MRD pipe and is awesome , way more power than the above. It's loud though...

Edited by WGP

Share this post


Link to post
Share on other sites

I have a 2009 with a 4.1 & the mega bomb pipe on it & it doesn't seem that loud at all. It has a nice sound to it & the bike def has good bottom end. I had the same system on my kxf & it sounded softer than stock...

Share this post


Link to post
Share on other sites

The header does make a difference on the '09.  I think it was smaller diameter than most of the aftermarket options. 

 

I was running a complete '06 Yamaha exhaust system and loved it.  My riding buddy had a Dubach full system which also worked great.  We did a comparison and couldn't tell any difference between the two.

 

--KT--

Share this post


Link to post
Share on other sites

The header does make a difference on the '09.  I think it was smaller diameter than most of the aftermarket options.

 

Bigger.  Too much bigger.  The oversizing was done as a compensation for the restrictive muffler.  With that gone, it's too large to effectively contribute to optimum exhaust efficiency.  Use an aftermarket pipe, or a stock header from '06 or '07.

Share this post


Link to post
Share on other sites

Bigger.  Too much bigger.  The oversizing was done as a compensation for the restrictive muffler.  With that gone, it's too large to effectively contribute to optimum exhaust efficiency.  Use an aftermarket pipe, or a stock header from '06 or '07.

 

 

I noticed you said "....or a stock header from '06 or '07."  What would the stock header from the '06 and '07 do with a stock muffler on the '09?  What if any performance gains are there?  What does the smaller header do for the '09?

Share this post


Link to post
Share on other sites

The '08 header was added to the restrictive muffler to increase the system volume as a way of reducing the pressure that the muffler causes.  It was necessary so that the bike would have anything like respectable top end power.  If you took the earlier headers and installed it with the shorty muffler from the '08, the bike would fall on its face above mid range. 

 

The only possible use I could see for the '08-'09 header as something you would use as a choice might be if you wanted to run a really quiet exhaust system.  It might add power it that case.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0

  • Similar Content

    • By Perri07
      I have a 2006 yz250. It was fully rebuilt top to bottom last winter before racing started
      rode all year and it was fine
      the problem I am having after winter start up is
      starts no problem, run decent, when I turn the throttle smoke and. Lack oil spray out of the silencer like if I put a glove on there's a nice layer of oil
       
      also the part of the carb that comes out of the tps and sits on the throttle slide. To me seems loose as in I can lift it to a point and it doesn't spring back. Is it suppose to stay tight to the top of the slide 
      it feels like it doesn't any force down till about 3/4 throttle when I hold it up with my finger 
       
      also when I lean my bike over the idle picks up a lot
       
       
    • By cosmoKenney
      2009 Husky WR 300.
      New top and bottom end.
      New brake pads and they were just bled. 
      Hyde skid plate.
      FMF Gnarly pipe and FMF Q-Stealth silencer.
      JD Jet kit.
      Comes with extra cylinder, head and piston. 
      Comes with lighter springs for the suspension.
      Pulls like a mule.
      This is an awesome trail bike. If you ride Georgetown, Foresthill, Elkins Flat or Chalk Bluff this bike will not let you down.
       
    • By Steve Sutton
      Apologies for the long post, but I’m including as much info as possible.
      I have a 2-Stroke Yamaha TDR250 1KT, same motor as the TZR250 apparently.
      I just completed a top-end rebuild. I only replaced the left piston as the right one look good. Probably should have replaced both, but anyway…
      My problem is the right cylinder/exhaust gets very hot very quickly and smokes a lot. The exhaust is hot only after 30 seconds of idling. The left remains room temperature and does not smoke.
      I don’t want to ride it too much in case it causes irreparable damage. But when I did try to ride her, I can only get a few hundred meters before she cuts out. I have to start again and can not get into 2nd gear before it stalls again. I’d have to limp home at a bicycle’s pace as anything above idle revs kills the engine.
      Not sure if the poor running is related to the hot exhaust, or another problem entirely.
      I’ve done the following troubleshooting:
      - swapped around plugs – no difference
      - swapped around plug leads – no difference
      - swapped around Carburetors (but not the Jet Needles) – This then made the left cylinder smoke and the right smoked a little, but not as much as previously. The carbs are back on their original sides as they are specifically left and right.
      - sprayed carb cleaner onto the carb boots to test for air leaks and that had no effect.
      - Raised the Jet Needle in the right carb for a richer mixture – It appears to smoke less (could be my imagination), but it still gets hot quickly.
      - Checked the plugs again and the troublesome cylinder’s plug looks to be running very rich (all dirty), so I lowered the needle this time for a leaner mixture. Still no difference.
      I removed the exhaust and wiped my finger in the cylinder’s exhaust port. Looks like black paint!
      Has anyone ever experienced this and what was the solution?
    • By nissan_twinturbo
      just curious if anyone has ridden both the new and last gen yz450 and how different they REALLY are. i can read reviews all day but theyre all from professional mx racers that probably pick up on little things id never notice. selling my ktm, pretty set on getting me a new yz, my price range is around 4k so that puts me in the range of buying a 2010-2013 yz450. however im being told from a few guys who ride these that i really need to save and spring for a 2014+, the cheapest 2014 i could find was $5000. are the 14's really that much better? should i save and go for one of those? My main actual question is with that same money could i make a 2013 the same or even better? What ever one i decide on ill probably do the same to either for aftermaket parts, exhaust , tuner, fly wheel weight and a lowering link in the rear. Ive ridden a 2015, which is what sold me on one, i loved it! i just dont wanna be disappointed if i get the early gen. either way will be better around the track then my ktm exc! lol, but man that electric start is soo nice
    • By LilBraaper
      Hello everyone I am 16 years old and I was a quad rider ever since I was young. I had a ltr 450 that I sold recently. I'm about 5'5"-5'6" tall and weigh about 115 lbs. I rode my friends rm 125 just this past weekend and I enjoyed riding the bike! I'm looking into buying a 125 but I still cant decide weather to buy a yz 125 or a ktm 125 sx. Again I'm a newer rider to dirt bikes but I still know how to ride one and I'm also new to 2 strokes but I've been doing a lot of research lately and learned a lot about them and all the maintenance with them. I will be using the bike for pretty much all trail riding. I just want a reliable bike that I can take care of that will give me no problems. Any Opinions/Preferences? Thankyou Everyone!