Installed a HMF slip on

[42F67N]

Installed my HMF slip on today and it sounds bad *** i jetted it with the 165 main i didnt adjust the screw because its pouring rain and i couldnt ride it to see if it needed to be adjusted.

deff a great sounding pipe!!!:blah:

http://img.photobucket.com/albums/v232/42F67N/kfxtoday001.jpg

http://img.photobucket.com/albums/v232/42F67N/kfxtoday005.jpg

[MoToX199]

nice pipe,wat year is ur quad,let me know how your gettin works out 4 you

[42F67N]

Its a 2005 HMF sent me 4 jets a 165 170 175 and a 180 the jet that was in the quad was a 130 i figured 130 to 165 is a big enough jump for just a slip on.

[MoToX199]

ok,i have 3 more questions thats it,are they minuki jets are dyojet? the reason why im askin is cause i also just recently ordered a hmf and they told me to run a 145 main,im curious why they sent you all those bigger jets then what they told me to run,also do you have the spark arestor in? can you let me know how the jetting works out for you when you get a chance to ride it? haha sorry for all the questions,but thnx for the info so far:)

[42F67N]

Im not sure what kinda jets they are:confused: i rode it today with the setting the way it was in my first post and it stumbled threw the mid range so i removed the air snorkel and now it runs great so i have a 165 main no air snorkel and i didnt touch the screw,thats all i did seems more powerful down low for sure not much diffrent up top.


The sound though is awesome!!

[MoToX199]

haha sry 2 more questions,do you know what your elevation is there? and do you have your spark aresstor in? thnx!

[42F67N]

I live right outside philly so id amgine its around the same as urs,it came with a spark arrerestor screen but i didnt put it in.

[MoToX199]

alright thanx for all the help,sry to bother you with so many questions lol

[42F67N]

No bother at all i know getting info on this board is tough to say the least:uhoh:

[250r/kfxrider]

Got the same pipe, love the sound and the low end power but the other day i raced my buddies 400ex and my top end is completly gone, he killed me! HMF only sent me a 145 and a 175 main jet. On their web site they say to run a 170 and 2.5 turns out on the mixture screw. I put in the 175 and 3 turns out and I think it is way too much! Stock it had less low end but 10 times more top end! I couldn't even hit the rev limiter in the top end of the last three gears ( i tried!). Their is no excuse to be beat by a 400ex with a KFX or a Z. I am ordering the dyno-jet kit to give me some more jetting options. By the way, that is with a UNI-filter, no air box lid, no spark arrestor, and in Nebraska...elevation unknown!
http://i57.photobucket.com/albums/g217/stealthrt93/kfx2.jpghttp://i57.photobucket.com/albums/g217/stealthrt93/kfx1.jpg

[42F67N]

Im gonna get mine out saturday and make sure the jetting is dead on before i take it out riding sunday. i think i have the jetting correct though

[kfx400ripper97]

i have an 03 kfx and a full system hmf and im runnin a 130 mainjet 2.5 turns thats pretty low to what hmf says i should do but im also up in canada

[MoToX199]

haha im gettin really confused now on what jets to run:p

[42F67N]

Originally posted by trick400ex
haha im gettin really confused now on what jets to run:p I just emailed HMF and they wrote me back i asked them there jetting recommendations and they wrote me back with "Set the fuel screw (2.0~2.5 turns out) and a 145 main jet. "so i wrote them back and asked if thats the case why did u send me a 165 170 175 and 180 main jet?

[MoToX199]

yea they also told me to run the 145 main,can you please keep me updated on what they say? thanks

[42F67N]

There replie back to me was no replie at all they never answered me,im gonna make a phone call to them and *****!

[MoToX199]

haha ok,just let us know how the out come is if you can,thanks

[42F67N]

Still no answer from HMF:ermm:


anywho i got the quad out today for some top speed runs and the jetting seems good to go quad has way more power down low for sure seemed to hit the rev limiter fast in 1st gear lol yanks the front end effortlessly even on slow 3rd gear riding im happy with it so far.

so my set up is the hmf slip on removed air snorkel and a 165 main jet thats it i did nothing else to it and its running good.

[MoToX199]

sweet,im happy you figured it out,haha one last thing do you have a stock filter? and you have the lid on correct? sorry to be a pain,but thanks for all the info:D

[42F67N]

yea it has a stock filter and the lids on the airbox

[MoToX199]

ok thanks for all the help you have given me and having having the patiece to deal with all my questions,sorry to be a pain:blah:

[42F67N]

No problem.

[250r/kfxrider]

I ended up throwing in the 145 Jet that I have, and went with 2.5 turns out on the mixture screw to start with. It runs sooooo much bettter than it did!!!!! Rev limiter is too easy to hit now, gonna look into the programable cdi box and get the extra rpm's that are there. Still no airbox lid and a UNI filter.

[42F67N]

wheres the mixture screw at on this carb anyway?

[250r/kfxrider]

What you have to do is, when you have the carb turned sidways to put the jet in look towards the front (engine side) and there will be small brass looking plug with a small hole in the middle, there are two plugs but this is the smaller one and the one closest to the motor and it looks like it is coming down a little from the carb. take a drill and a small drill bit and use the small hole for a starting point. Drill through the plug and it should come out, if not move up a bit size or two until you can pry or pull it out. Don't worry, there is a gap between the plug and the mixture screw, once the plug is gone you can see the mixture screw! Pretty simple.:)

[kfx400ripper97]

im runnin my airlid and snorkel with a full system hmf and a 130 mj 2.5 turns , im also in canada. does that seem right?

[Jeffksf]

Originally posted by kfx400ripper97
im runnin my airlid and snorkel with a full system hmf and a 130 mj 2.5 turns , im also in canada. does that seem right?
Thats way to lean unless your in the mountains maybe, but the stock jet is a 135 or 130 so having a full system you should atleast be at a 165 probably more like 170 or 175.

[Z400Silverado]

Great pipe, I was very impressed with my HMF I used to run.

[42F67N]

does anyone have or know of a place with a picture of where to drill?


HMF sent me to jets today in the mail no charge they sent me a 145 and a 150 main im gonna drop it down to a 150 and see how it performs

[250r/kfxrider]

I'll try and get ya some pics of where to drill this weekend!

[MoToX199]

do you know if there minuki jets or dyno jets?

[SWIFT]

I'm running a HMF slip on, K&N, no snorkel and a 155 main and it seems to be dead on. It runs strong

[booterskuggs]

Just putting a slip on wont require rejetting, its letting more air into your engine that make jetting a need. If you take off your airbox lid you will need to rejet. If you leave it on you wont. My mods are no lid, MBRP pipe,165 main,3@1/2 turns out on the fuel screw and mine runs like a raped ape