I want more low end response


9 replies to this topic
  • motocross_rockstr

Posted September 28, 2008 - 11:38 AM

#1

I have a 2007 YZ450F and I love this bike, theres only one little prob i have with it. It needs more low end grunt. It doesn't have the torque i want when i need to be up in a higher gear to clear a certain jump, but dont have the runway for it. I was just wondering if anybody had any suggestions out there. I'm prob gonna go for a twin bros exhaust I've heard good things but if theres any other suggestions or opinions out there please let me know.

  • grayracer513

Posted September 28, 2008 - 11:45 AM

#2

The things you've heard about the Two Bros exhaust have probably been in connection with an '08 YZ450, not an '07. Almost any pipe will give give an '08 a mid range boost, but an '07 does not have the same handicap the '08 does.

I suggest using the exhaust cam from an '06 YZ450. It's the same profile as the '07, but the lobe centering is different. It should help quite a bit.

Another thing that will help, if you are running the stock pipe, is a DRD exhaust system. The full stainless is a very good value, and I find it adds to the low end while maintaining good high end power.

  • The Italian Stallion

Posted September 28, 2008 - 12:29 PM

#3

DR D and a 51 rear sprocket Zip ty card mod:thumbsup:

  • desert-rat660

Posted September 28, 2008 - 12:51 PM

#4

i put a HC piston in my 06 and the bottom end torque was really improved

  • Slinkyman16

Posted September 28, 2008 - 01:08 PM

#5

a few ways.
a cheap way.. going up a tooth or 2 in the rear..

then a exhaust. dr.d is a good one.. if ur on the cheap. MRD is also a very great value.. he can custome spec u a exhaust for where u want the power to be. also has a lifetime warrenty..(but most any exhaust for the 07 will do something for the power delievery.not much but some)

then a High comp pistion will do it to but u will have to run race gas.

also might want to think about sending ur carb to ziptye and see if that helps.. its a good way to spend a 100 bucks..
theirs a few ways u can do it.. all depends on how much u want to spend.

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  • desert-rat660

Posted September 28, 2008 - 03:03 PM

#6

i wasw able to still use 91 octane fuel without pre ignition occuring

  • mywifefarts

Posted September 28, 2008 - 03:12 PM

#7

I also have an '07 yz450f. I know the cam from an o6 would be more effective but I've been wondering if a pipe from an 'o6 would slip on without any major problems or jetting issues. If so would the bigger diameter help at all.

  • grayracer513

Posted September 28, 2008 - 06:44 PM

#8

It might, but my instincts tell me it wouldn't help much if it did at all.

  • Wiz636

Posted September 29, 2008 - 08:36 AM

#9

Another thing that will help, if you are running the stock pipe, is a DRD exhaust system. The full stainless is a very good value, and I find it adds to the low end while maintaining good high end power.


I could not agree more.

http://www.thumperta...841#post7005841

  • mywifefarts

Posted September 29, 2008 - 01:58 PM

#10

What about the WB carbon or aluminum pro. I've noticed alot of nice closeout prices since they were bought out





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