N00b ..

[sheefreak]

Fatty's

[2k4_Shee]

in your opinion which way do u see this working out better.

 

 

A) bottom end sprocket and a high rev pipe

 

or

 

B)top end sprocket and a bottom end pipe

 

the more i read the better im understanding the pipe/powerband hits but as far as gearing would you be better changing both sprockets or just changin one? Btw what is the stock gearing...Larger number of teeth=more top end, correct?

[Ducman]

We'll I have had Gnarlies and Rockets on my stock motor and Rockets on my 4mm stroker. I don't have a dyno graph sitting right in front of me but I haven't ever heard of T-5's or any other high rev pipe compared to FMFs as nearly the same. The peak HP output might be with in a couple ponies but the rpms where they make them wont be all that close and it will make a difference depending on what type of riding you are doing.

 

I know that the low end came on quite a bit earlier with the FMF's than the Rockets that is they "got on the pipe" at a much earlier rpm, although the Rockets had decent low end torque before they began to hit the pipe. The rockets did make quite a bit more top end power and rev way the hell higher though which allows you to shift into the next gear at a higher rpm, therfore higher up in the power band when you go into the next gear. What this does is allow you to pull a higher gear under the same load conditions. In the sand this allows you to pull higher gears and goway faster on the top end. In the dirt on say a gravel road you would probably spin the tires and go slower if you cant get traction. It can be easier to get a holeshot with a bottom end pipe because you are less likely to bog and the motor will pickup rpms better from a dig. Also the top end pipe has a little lag getting on the pipe if you are at a lower RPM. You have to clutch it to get on the pipe which will spinn the wheels where as a low end pipe might just get right on the pipe and hook up better because you don't have to spin the wheels to get on the pipe.

 

If you want to use a low end pipe on a mostly stock motor with high gearing 1st through 3rd gear are going to kick ass but you probably wont pull 5th hard enough to make it very useful and it might not be able pull 6th at all. With a top end pipe and a low geared sprocket the gears are going to be too close together to utilise the top end in the lower gears, you'll be constantly shifting making it uneffective in lower gears but it will pull 5th and 6th like a mofo and you'll be deadly in the 40 to 65 mph range. This is why people usually go for low end pipes for riding at slower speeds, 1rst through 4th gear, trails, mx, ect. If you want to go balls to the wall in sand, and pull 5th/6th a top end pipe is the way to go. In sand, I couldn't beat a stock YFZ with my gnarlies other than pretty good holeshot. With just rockets it evened out pretty good. With my rockets and stroker, I have a tough time putting power down with a stock swinger for the holeshot (front end shoots for sky) but once I hit 3rd, I reel in even a piped/modded YFZ, and they get owned real effin fast.

[2k4_Shee]

yea i ride with mostly thumpers and they are giving me a hell of a run for my money bc they start off like a mofo. I want a pipe to be able to jump on them soon and hold them down...I plan to do other mods as well such as reeds, k&n, maybe a sprocket change but not sure yet, and i was thinking about someday maybe a little motor work like a small port or big bore kit...Basically i want the pipe that will let me jump on the down low and hold them down...

[superchicken]

old school fmf gold series,are the ticket for ya.i ran them last year and loved them.whent to rockets and love them like a drunk blonde.the gold series are simular to fatty's but with a nickle finish.you can pick them up pretty cheep too

[Ducman]

If you want to get the 4 strokes out of the hole and keep them behind you, on a fairly stock bike the trick is going to be getting good traction on the launch for a hole shot and gearing and HP to stay ahead. For a stock motor I'd say a set of maxis I-razers for traction, a 15 tooth front sproket/stock rear, and FMF SST or similar good all around pipe. In a sand drag you'd want more of a high rev pipe, not for the launch, but to pull hard once your out of the hole since sand takes a bit more HP and higher revs in the taller gears. Mods like timing advance, lightened flywheel, more compresion will help you get out of the hole better too.