I want more low end response

[motocross_rockstr]

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]

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]

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

[desert-rat660]

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

[Slinkyman16]

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.

[desert-rat660]

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

[mywifefarts]

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]

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

[Wiz636]

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.

https://www.thumpertalk.com/forum/showthread.php?p=7005841#post7005841

[mywifefarts]

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