To you sport bikers

[Headz400]

Ive heard of people taking off their silencer. I took it off on my z400 and it increased acc. a lil. Would it be good to run it like this w/o the silencer i mean their aint much the silencer does, but im afraid ill be running lean or something.

[Chuck_Norris]

anything your do to increase flow in or out will require increased jetting to avoid the lean conditions. most quads come from the factory already lean. I am running the JET4POWER system on my YFZ450 so knowing where I am is as easy a reading the meter

[Headz400]

So would it still be ok to run it without the silencer?

[Chuck_Norris]

So would it still be ok to run it without the silencer?

make a run at WOT, turn the bike off and read the spark plug if it is white or the header is glowing then you are way to lean.

[Headz400]

wats WOT?

[atvtrailer]

wide open throttle  

[2Raptors]

Start with a new plug then run wide open thru the gears turn around and run wide open back, then pull your plug to check color.  White=lean, tan=good, brown/black=rich

[Axo]

You will want alittle back pressure. I dont recommend running an open header.

[Headz400]

ok so if i am running lean w/o the silencer i mean would it mess up the bike?

[koh0001]

 it will Burn up the pistons.mabe a hole right in the middle.

[Headz400]

So in order to ride it like i would have to jet it correct? to what size would be good? i dont plan on doin anything else cause i dont really race that much. im mostly trails. just like how the bike sounds like that w/o having to spend money on an exhaust.

[KFXhead]

Spend the money on an exhaust that was engineered to do what you want without compromising your engine. I can guarantee you that a holed piston will cost more than $250 that a good pipe would cost you. JMHO. Take out the spark arrestor from your stock pipe & it will sound better or louder like you want & no problems with jetting.

[Headz400]

Wat exhaust can i get for $250? Are u talkin about slip-on or the whole system?

[2Raptors]

Ebay

[KFXhead]

Slip-on. I have the KFX version of your ride & I just put a white bros e-series on it & it made a big difference.

[Headz400]

i think imma go with the HMF slip-on. on ebay it was for like $269 with a jet kit and filter.

Would the gains be very noticable?

[Da_Mtg_Man]

Get Curtis Sparks if you have or plan to have some serious motor mods. If not then go with the W. B. E-series. It is hands down the second best pipe for the Z400. I've seen it in action and it produces huge power.

[Headz400]

I dont plan on doin serious engine work just the basic like filter kit, jet it and slip-on.

[KFXhead]

I was lucky to find a like new White Bros E-Series from a friend of "da mtg man's" on this site  for sale & he hooked me up for $140 cash & it looks like new. To answer your question, YES you will see & feel a difference. I did & I love it!!!

[Z-rider03]

call leesons motors, you can get a brand new hmf slip on with jet kit and uni air filter for 220. hmf rocks, check out dirt wheels pipe shootout, best powerband from bottom to top. its true.

[Z-rider03]

leesons motors 1-866-leesons