2004 yz 450f

[yz450frida]

Which teethe and sprocket kind should i use for trail and wooded area ridding for a more top end speed and torque?

[yz450frida]

And whats a good silencer for a fmf powerbomb?

[Hoosier-Daddy]

I cant see anyone needing a sprocket setup with more top speed than stock for the woods. I actually went 2 teeth bigger on the back for the woods on my 09. I still don't hit 5th gear very often. It gave me more control in the tight stuff and less likely to stall without a ton of clutch. I use steel sprockets for low cost and durability. I don't need the lightest sprockets in the woods.

[seacraft69]

Gearing for top speed and torque ain't gonna happen. Pretty much one or the other. However for trail I'm running a 51 tooth rear. And for exhaust I have an fmf factory 4.1.

[Will.A.R.]

Drop one tooth on front, flywheel weight. Stock exhaust. U won't ever use the power that things got in the woods

[Hoosier-Daddy]

Drop one tooth on front, flywheel weight. Stock exhaust. U won't ever use the power that things got in the woods

I love the power on the bigger hills!

I also love the flywheel weight!

[yz450frida]

My chains and sprocket are pretty worn. 51 tooth thats for more torque would you go with a 12 or 13tooth front sprocket.

[Hoosier-Daddy]

My chains and sprocket are pretty worn. 51 tooth thats for more torque would you go with a 12 or 13tooth front sprocket.

I believe stock is 14/48 on your 2004. I saw significant change going up 2 in the back leaving the front alone on my 09.(13/49 stock)(heavy flywheel weight is big help)

The smaller you go on the front, the faster you will wear your chain and sprockets out. If you have stock on there now(14/48), you will see a huge change going to 13/51.

So to answer your question I would try a 13, especially if you are trying to still have some top end like your original post stated.

Edited April 11, 2014 by Hoosier-Daddy

[yz450frida]

thanks Imma give that at go. heavyer flywheel? what would that do?

[Hoosier-Daddy]

thanks Imma give that at go. heavyer flywheel? what would that do?

Heavy flywheel, besides getting suspension done, is the best improvement I have seen in my bike.( I dont have a rekluse) It helps prevent stalling at low rpm, inproves traction, smooths power, makes bike less herky jerky, easier to lug the bike. There are threads about it. I got the gytr 9.21oz. easy to install with flywheel puller.

My bike is like night and day after flywheel weight, lower gearing like you are looking to do, and suspension.

[TenCrows]

I used to have an '04.  I found out I didn't like how it came stock, but I ended up going to a 15/49 for more top end, but I didn't ride in the woods with it.  I used to do trails round the area sometimes that were tighter, but I just learned to deal with the clutch.  Changing the gearing doesn't seem like it changes the low speed operation like it does high speed. 

[yz450frida]

Cool if You Ride a bike without Packing how much damage Would it do?

[yz450frida]

I got a powerboMb header and a getting kit installed.

[Hoosier-Daddy]

Changing the gearing doesn't seem like it changes the low speed operation like it does high speed.

I respectfully disagree

[grayracer513]

I do agree.  Numerically, it makes a much bigger difference at speed than plunking around.  If you make a 10% change in gear ratio, and you were running 12 mph at 3000 in first and 62 mph at 8000 in 4th to begin with, the result will take your 8K speed down to 53 mph, but your speed in first at 3K will only drop to 10.8.

 

That might be enough to make it feel better, but I ran into exactly what TC mentioned on the '03 I had.

[Hoosier-Daddy]

I was judging strictly by feel of before and after I changed sprockets. The gain at the bottom, mathematically small but noticeably helpful in the tighter woods, was worth it to me because I was very rarely hitting top speed.

Edited April 11, 2014 by Hoosier-Daddy

[yz450frida]

Im looking for more torque ill be ridding rocky hilly terrain were imma have to make my own trails

[TenCrows]

I do agree.  Numerically, it makes a much bigger difference at speed than plunking around.  If you make a 10% change in gear ratio, and you were running 12 mph at 3000 in first and 62 mph at 8000 in 4th to begin with, the result will take your 8K speed down to 53 mph, but your speed in first at 3K will only drop to 10.8.

 

That might be enough to make it feel better, but I ran into exactly what TC mentioned on the '03 I had.

 

Same thing I saw when I tried lowering the gear.  The opposite happened when I went higher.  I gained a lot of speed in fourth without changing 1st much at all.  

Edited April 12, 2014 by TenCrows