whitch pipe 2 get

[colt45]

hi i was wondering what pipe to get either a hmf sport slip-on or a bill ballance slip on what tjhe differences were and witch one will be louder? it also come with a 170 MIKUNI SMALL ROUND main jet and a uni air filter i want the louder 1 so tell me what u think thanks! and is the jet the right size ,do i need to run with out a lid? thanks if u answer

[ohsobad_chevy]

I would recommend going with the full system for starters. HMF's slip ons are proven to work better with their own head pipe. I have heard the ballance series on a trx450r and I have heard the regular sport series on a yfz 450. The Ballance was a little louder to me, but not all that much. I think the regular sport series had a lil better tone to it. Trust me man, loud will get old reeeeally quick... I know you think it sounds kool, but I ride in the trees a lot and it kinda gets annoying. I have a 400ex with a HMF sport full system and it is LOUD in the trees. My 2 pennies.:cool:

[krt400ex]

a mikuni 170 is way too big. get a keihin 155 or 158 and shelve the airbox lid.

[JW450R1]

HMF FULL SYSTEM.WOW

[GPracer2500]

Keihin? Z400s have a Mikuni BSR36. I thought the carb was upgraded in 05' [shrug]--not sure if that changes the jetting specs or not.

Whatever the case regarding the carb, you'll have to rejet according to your location and riding conditions. Don't expect anyone to hand you a jet (especially if they don't know the details of your riding environment) and expect it to be right. My impression has been that HMF's published jetting "suggestions" are only right for the densest of air. Makes sense though--that protects HMF from people running their engines dangerously lean.

[krt400ex]

Originally posted by GPracer2500
Keihin? Z400s have a Mikuni BSR36. I thought the carb was upgraded in 05' [shrug]--not sure if that changes the jetting specs or not.

Whatever the case regarding the carb, you'll have to rejet according to your location and riding conditions. Don't expect anyone to hand you a jet (especially if they don't know the details of your riding environment) and expect it to be right. My impression has been that HMF's published jetting "suggestions" are only right for the densest of air. Makes sense though--that protects HMF from people running their engines dangerously lean.



sorry, i assumed he had a 400ex because he is in a 400ex forum. didn't notice it was a z400 in his sig. the ex's have keihin carbs.

[slvrlakerdr08]

get the regular version but ask for the Eliptical version of it, it has a beefier deeper sound, trust me its what i have on my 450r and it sounds good

[ohsobad_chevy]

Originally posted by slvrlakerdr08
get the regular version but ask for the Eliptical version of it, it has a beefier deeper sound, trust me its what i have on my 450r and it sounds good

Tell us more about the elipticle version...I have never heard of that from HMF.

[slvrlakerdr08]

well its like a white brothers shaped cannister with the same round end cap but it gives more bottom end and is throatier, and runs good. go to the HMF site and on their they have them in either E or R when you order the E is eliptical and the R is round.

[colt45]

Originally posted by krt400ex
a mikuni 170 is way too big. get a keihin 155 or 158 and shelve the airbox lid.

what if i get a full system is the 170 mikuni jet fine?

[04hmf400ex]

I have a slip on hmf sport series with a 158 main jet and a k & n filter and wow does it help that 400ex. I can stick with a 450r on one of our local tracks. ill n ever buy any other. my neighbor has a 400ex with different cam, high comp piston, port and polish, and full white bros and i can stick right with him. that is just my thoughts though.

[organiz3d_chaos]

Originally posted by ohsobad_chevy
Tell us more about the elipticle version...I have never heard of that from HMF.

Looks like they don't make them for the 400ex, but they do make them for the 450r.

[ohsobad_chevy]

Originally posted by organiz3d_chaos
Looks like they don't make them for the 400ex, but they do make them for the 450r.

Yeah, just found that on their site. Did you get a quad yet?

[organiz3d_chaos]

Originally posted by ohsobad_chevy
Yeah, just found that on their site. Did you get a quad yet?

Yea got me a black 06 450er on saturday...today im sore....

[ohsobad_chevy]

Originally posted by organiz3d_chaos
Yea got me a black 06 450er on saturday...today im sore....

LOL roger. what you think about it?

[organiz3d_chaos]

Originally posted by ohsobad_chevy
LOL roger. what you think about it?

I like it...

Hopefully this guy was done with his thread since we jacked it :p

[krt400ex]

Originally posted by colt45
what if i get a full system is the 170 mikuni jet fine?


first off, i was saying that thinking u had a 400ex. i apperantly wrong. next thing, it would prolly work fine if u shelved the airbox lid. just do the plug check. it the plug is a light chocolate brown color ur jetting is good. if it's white or a very light color then ur lean. if it is black then ur rich and if it is wet then ur really rich.

[ohsobad_chevy]

Hey man, for starters you can go here: http://www.atvriders.com/articles/jetting.html Read through that a few times and you will start to get a good understanding. You will be surprised how picky your quad is when it comes to jetting. What elevation are you at by the way? I would think that a 170 is a lil big for no more mods than you have. I would start with a 155 main. It is better to start rich and get leaner. Keep in mind the temperature change from early morning to mid afternoon because it will make a difference. Jetting is never 100% correct at ALL times.