'07 exhaust q's
Posted April 29, 2009 - 12:52 PM
I jumped on a buddy's '05 "other brand" 450 and was absolutely blown away with the power of his bike. He was also shocked at the lack of power on my bike as compared to his. Both bikes are stock with free mods done the only difference is that his had a Pro Circuit Ti4 pipe and header.
I know the exhaust argument has gone circles around here but will a pipe and header TRULY make that big of a difference? Anyone ever do a dyno comparison?
Posted April 29, 2009 - 02:08 PM
Posted April 30, 2009 - 11:11 AM
I'm not saying that more free flowing exhaust won't give you more but I found I never really needed it and $45 US and a few minutes of labor gave me enough flow while staying below our 98db noise rule:thumbsup:
Having said this... I just fitted a FMF Q2 and Mega Bomb header all mfg'd for an 06' YZ450F... I have not had a chance to even fire it up yet but I am expecting power gains...
Posted April 30, 2009 - 12:06 PM
For me, I know with my ability i'm never going to be able to extract everything that my '08 WR450's got, but riding is also about enjoyment. If I'm having more fun with more power than I need it's money well spent for me;)
I've got an FMF 4.1 on mine and absolutely love it. And in relation to other bikes, I never seem to be short on power with the group I normally ride with, which is a mix of CRFs and EXCs, and that's in sandy, whooped out riding which is pretty open and power-reliant in places. WRs still rock me for me and, the way I'm thinking at the moment having already owned two of them, I'll only be buying WRs in the future unless something radical comes along.
Posted April 30, 2009 - 01:34 PM
I know one tooth on the rear is no big deal by itself but that mixed with a pipe/header combo might be part of it, huh?
I would think dropping one tooth on the front would make a huge difference but not on the rear...any thoughts?
Posted April 30, 2009 - 01:50 PM
A 51T rear might workout alright:ride:
Posted May 01, 2009 - 12:43 PM
Posted May 01, 2009 - 07:15 PM
You didn't mention airbox mod. I would suggest doing that immediately. Followed by adding a pipe. Opening up the "inhale" is best matched by opening up the "exhale." All this resulting in needing a JD jetting kit or the GYTR AIS removal kit (comes with jets/needles).
Do the above and you will find yourself taming a wild new animal. And, IMHO, you will have your red friend looking at ways to mod his bike after riding yours again.
Posted May 02, 2009 - 03:35 AM
Posted May 02, 2009 - 02:09 PM
modifying the stock exhaust on my 08 wr450.
This needs to be done properly, not half-assed (I'm not suggesting you in particular did it this way desdave BTW! It's just that it seems that so many do.)
It needs to be modified right through in order to achieve real gains in performance.
Investigate not only what you can see from the outside, but also the "guts" of your muffler, then do the math (calculate effective oriface diameters etc.)..... then modify properly and HANG ON!
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Posted May 02, 2009 - 05:35 PM
Posted May 05, 2009 - 02:56 AM
It seriously is bullshit that you make a $12,000 performance race bike and deliver it in that state. Regulations or not, you can make a fast bike and still
meet the regulations. I don't stand for that excuse. I have a 2.3 litre, 204kw car that meets all the regulations and still gets 5.6 litres/100km on the open highway. I also have an sv650 road bike that pumps 72 bhp and also meets all emissions and noise standards.
Posted May 06, 2009 - 02:37 AM
The way i picked up my 08 was rubbish. It was boggy, restricted and slow.
Mate, sounds like you picked the wrong dealer!
Dave Fraser (near Wollongong) sold me mine totally unrestricted, it flew from the first ride.
Posted May 06, 2009 - 11:54 PM
Posted May 07, 2009 - 03:13 AM
As it turns out, the bike is so rich the spark plug looks like chargrilled bacon.
Aaah, actually I must admit that mine was quite rich when delivered too come to think of it.
It certainly still went well initially, but even better soon after that first ride after I'd gone down a couple of sizes in main jet.