Stupid Exhaust question

[LazeR]

With a WB E-series, if i am running say 8 disks and drop it down to 4 will it make me run rich? or will i not need to worry about jetting when going from different amount of disks?

[4TraxRider]

You'll need to rejet to acheive the best power gains when adjusting the amount of disks on a pipe.

[cals400ex]

a lot will depend on how your air/fuel ratio is now. i don't run a pipe with discs, so i don't know if adding or subtracting discs makes the bike richer. i don't think changing disks changes the air/fuel ratio a lot, but instead just a little. the temperature, altitude, and modifications will all change your jetting. i always go by what the plug tells me. i then fine tune by how the bike runs against another bike similar as mine.

I really dont think it will make much of a difference. If you are a little rich right now you dont need to worry about it. On my old 300ex i didnt even rejet. I know it was stupid but i didnt.

[ewalker302]

Fewer disks = Lean, and increase in bottom end

More discs = rich, increase top end


As far as jetting, you just have to try and see.

If removing 4 discs you may have to go down on the main, you may just need to close the air/fuel screw to adjust.

:bandit:

[hondarider2006]

Originally posted by ewalker302
Fewer disks = Lean, and increase in bottom end

More discs = rich, increase top end


I thought it was the other way around???:huh

[xc400ex]

more discs = more flow = bigger jets
fewer discs= less flow = smaller jets

or you can just take all of them out like i did.

[LazeR]

So most likely i should rejet! Also, will i have to change my pilot since i have a K&N Filter and the Pipe? or will it not lean out in the bottom end?


also thanx for everyones help so far!

[cals400ex]

the pilot jets are lean from the factory anyways so i would change it. i found the 42 to do what i need right now.

[bdrue]

how the heck does more discs equal more flow? i dont think it makes any sense:confused:

[xc400ex]

If you look at the discs the air flow exits between them. If you was to put on 1 disc the quad probably wouldnt even run at all. The more disc the more square inches of opening, therefore being more flow.

hes right mpore disks = more flow. I think if you have 4 disks then it is the same as stock.

[LazeR]

Originally posted by Jingle
hes right mpore disks = more flow. I think if you have 4 disks then it is the same as stock.


I will prolly have run like 4-5 discs when im at the dunes so i wont get a ticket!

[ewalker302]

I think running four discs pretty much negates the benefits of having an aftermarket pipe at all.

I run 9 in my megamaxxII and I have read of people here running 12-14 on meganmaxx and e-series pipes.

:bandit:

[JOEX]

Originally posted by ewalker302
I think running four discs pretty much negates the benefits of having an aftermarket pipe at all.

:bandit:
Yeah, it pretty much does but at the dunes out here the db limit is 93 and I think they are trying to lower it even more. So running few discs helps quiet it down.

Joe

[ewalker302]

With the e-series quiet core installed it shouldnt be too loud w/8 discs.

You mean there are no 2 strokes riding the dunes??

:bandit:

[JOEX]

I'll probably be getting a quiet core for mine to keep the noise down if it will really work.

Ther are plenty of 2 strokes but they seem to have a lower db than 4 strokes:huh

Here is some data on sound recordings.....
http://www.oohva.org/pages/What%20Works%20for%20Sound.html#Anchor-47857

Joe

[JOEX]

There is more info here divided by manufacturer...
http://www.oohva.org/pages/sound.html

Joe

[airheadedduner]

You mean there are no 2 strokes riding the dunes??
Shees are the most common dune bikes. A lot of people run Toomey pipes. With the hush kit from Toomey they are around 87-89db. The sound from thumpers carries a lot farther then the noise from a 2 stroke too.


LazeR, you should be okay as far as sound with 6 discs, maybe 8. If you see the sound cops go over to them and have them curtesy check it. I don't think they are supposed to give you a ticket that way. If it is too loud just take out more discs. Or you can do what I do and haul *** the other way:blah: As far as removing discs efecting jetting. It don't a whole lot. When I first got my 440 it had 12 discs in it. I dropped it down to 6 and it was fine.

[ewalker302]

I dont know if the sand absorbs the higher pitched 2 stroke sound better, but I do know that I can hear my nephew's 2 stroke yammi 80 dirt bike at my house 1 1/2-2 miles away through the woods.

:bandit: