Hmf jetting help

[98300exduner]

Okay well I just got a bill balance slip on for my 03 400ex I ride at silver lake sand dunes probably 7-8 times a year. I live in granger Indiana and my motor is all stock. What should I do for jetting. Thanks

[honda400ex2003]

http://www.exriders.com/vbb/showthread.php?s=&threadid=445695&highlight=jetting+placement

should be everything you will need to get it dialed in. there are suggestions to go off of then do the chops. steve

[AtvKid4Eva]

i live in Ohio and on my stock 400 i ran a 165 main with the airbox lid off and it ran great. should get you in the ballpark.

[2001400exrida]

heck no taht's why to high a number.

put a 152 main in it and you should be good to go, may have to bring the pilot screw out another half turn.

[Zeb400EX]

Originally posted by AtvKid4Eva
i live in Ohio and on my stock 400 i ran a 165 main with the airbox lid off and it ran great. should get you in the ballpark.

I'm in southern indiana and I run the same (165 main) with the lid and it ran perfect. Took the lid off and ran a 170 main and it screamed!

[2001400exrida]

those numbers are way to high for a stock 400ex with just a slip on. even if the airbox lid is off.

slip on stock jetting is usually anywhere from 150-158 main. you don't open it up that much with a slip on. Now put a full system on it and you will get a bigger main.

[honda400ex2003]

check out the excel chart on the link for something that will get close if not perfect. steve

[AtvKid4Eva]

My bike ran perfect with a 165 main and the lid off. It all depends where you live and what elevations your at so it's not a standard jet size for a slip on.. Just have to test out a few sizes...i figured you live close to me so that would give you a decent starting point. Good luck

[honda400ex2003]

correctamoondo lol anything we can give is only going to get you close. temps, elev, and such make a big difference. with the cold and low elevation you will be running pretty big till spring. steve

[2001400exrida]

Originally posted by AtvKid4Eva
My bike ran perfect with a 165 main and the lid off. It all depends where you live and what elevations your at so it's not a standard jet size for a slip on.. Just have to test out a few sizes...i figured you live close to me so that would give you a decent starting point. Good luck

he is around my same elevation and those numbers are way to high for a stock 400ex with just a slip on. I don't care what you fellas say.

You're gonna be running something in the 150-158 range with a slip on as your only mod.


You can't tell me that your'e gonna go from the stock 148 main jet all the way to a 165 when all you did was put a slip on it and open the lid. nope sorry dudes that's bad advice for a starting piont.

Take my word for it and throw a 152 main jet in there and see hwo it runs.

[jensenracing77]

Originally posted by 2001400exrida
he is around my same elevation and those numbers are way to high for a stock 400ex with just a slip on. I don't care what you fellas say.

You're gonna be running something in the 150-158 range with a slip on as your only mod.


You can't tell me that your'e gonna go from the stock 148 main jet all the way to a 165 when all you did was put a slip on it and open the lid. nope sorry dudes that's bad advice for a starting piont.

Take my word for it and throw a 152 main jet in there and see hwo it runs.
X2, even with many mods you would be at the high end of the jetting range of the carb capabilities.

[98300exduner]

Thanks guy I'll be in the 150 range. And do I have to have two different jetting for summer and winter eventhought I probably ride it 2-3 times ever winter month

[AtvKid4Eva]

haha listen to you guys..i like how you tell me that my jetting was off but in fact my bike ran PERFECT and the plug was dead on..its ok tho i was only trying to help.

[2001400exrida]

it's ok if your jetting was right on, to each their own.

I just did not want you to suggest a 165 main jet to somebody who is only running a slip on. that's not a helpful suggestion at all.

I know this kids elevation, i live right next door to him in illinois. he will be needing a 150 or a 152 to start off. Your 165 was way too big so i dunno how your quad ran so good unless you had other work done to it.

the point is, if you want to help don't suggest a 165 to somebody who only has a slip on, that' absurd and i'm suprised honda dude didn't step in and agree because it just makes things harder for the guy who is trying to find the right numbers.

[AtvKid4Eva]

if you live right next door why didnt you just help him instead of him posting on here? judging by your 33 posts im not sure how right you are..when i bought my slip on the jetting HMF recommended was a 165 main this was years ago and it may have change but then thats what i ran and all i had done was a slip on to the motor..ive built several 400's and know how jetting works so you dont need to tell me my post wasnt helpful...it is what it is go next door and help him get his bike running instead of sitting on her arguing with me. have fun.

[2001400exrida]

i'm trying to help him by giving him more correct numbers. are you talking about the stock numbers (keihen)?

the dynojet numbers are lower than the stock ones.

Anyway, i meant that i live in the state next door, and indiana doesn't get to much higher in elevation than illinois does.

there is no reason for you to take offense, i'm just trying to save this guy some trouble.

With just a slip on, he's going to be alot closer to a 152 main jet then he is a 165 (stock numbers). I'm running a 416 with a fmf powerbomb and a supertrapp pipe, k&n air filter and it has a 168 keihen main jet. so you can't tell me this guy is gonna run a mostly stock motor with only a slip on and a 165 main jet. sorry that thing won't run good. unless you're 6k above sea level then u might possibly but i still doubt doubt it.

ps. hmf has never recommend a 165 in their instructions for a slip-on. mayhbe a full system but i doubt that too... i don't know where you got your information but it's wrong.

[AtvKid4Eva]

done with this thread. have fun.

[98300exduner]

hey thanks guys for both of ur opinions they are both helpful. i dont want people to be arguing. forums are for people to help everyone out and more imput the better to help narrow down my choices. i will take both of ur guys advice's thank you both.

[jensenracing77]

i have to agree with 2001400exrida
even with the full system (400EX don't need a differant head pipe) and air filter and no lid you will only be about a 152. i built some TC Racing MX engines, the ones i built with the stock head and carb was only a 158 and 160. around the MX tracks i have seen many times people have bigger jets than needed.

[bherriman]

My brother picked up an HMF competition Slip on and they recommend a 165-175 on a stock bike, depending on elevation. I put a 165 in and its perfect. That being said, when i still had my stock carb I was running a 155 with a 416, slip on, filter, and holes drilled in the lid. It almost impossible to jet your bike according to the next guys bike. Trial and error is the best option.

[2001400exrida]

here's my 416 if u wanna see it.

http://i102.photobucket.com/albums/m93/rschaef83/IMG_0647.jpg
cutting the swingarm off

http://i102.photobucket.com/albums/m93/rschaef83/IMG_0635.jpg
redneck hauler, mine is on the right.

http://i102.photobucket.com/albums/m93/rschaef83/IMG_0640.jpg
before i put the header on.

http://i102.photobucket.com/albums/m93/rschaef83/416.jpg
new 450r swingarm and axle, i still have to get my brakes on.

http://i102.photobucket.com/albums/m93/rschaef83/IMG_0642.jpg
busted carrier before i replaced the stock rear end.

[2001400exrida]

Originally posted by bherriman
My brother picked up an HMF competition Slip on and they recommend a 165-175 on a stock bike, depending on elevation. I put a 165 in and its perfect. That being said, when i still had my stock carb I was running a 155 with a 416, slip on, filter, and holes drilled in the lid. It almost impossible to jet your bike according to the next guys bike. Trial and error is the best option.


like 4 of my friends have that pipe it is very common. you're gonna be way to rich with a 165 man that's ridiculous.

i dunno why they recoomend that

[98300exduner]

okay so im going to be looking around 152-160. im new to thsi stuff and the chart is sorta confusing.

[bherriman]

Alright let me take a pic of the instructions. You might wanna take a look at those 4 instruction sheets you have before you open your mouth again. I guess i was wrong though It recommends a 165-170 not 175. I'll post a pic in a minute.

[2001400exrida]

yeah try the 152 it'll get ya real close.

[bherriman]

<a href="http://s1190.photobucket.com/albums/z445/bherriman/?action=view&amp;current=DSCN1170.jpg" target="_blank"><img src="http://i1190.photobucket.com/albums/z445/bherriman/DSCN1170.jpg" border="0" alt="Photobucket"></a>





<a href="http://s1190.photobucket.com/albums/z445/bherriman/?action=view&amp;current=DSCN1169.jpg" target="_blank"><img src="http://i1190.photobucket.com/albums/z445/bherriman/DSCN1169.jpg" border="0" alt="Photobucket"></a>





<a href="http://s1190.photobucket.com/albums/z445/bherriman/?action=view&amp;current=DSCN1168.jpg" target="_blank"><img src="http://i1190.photobucket.com/albums/z445/bherriman/DSCN1168.jpg" border="0" alt="Photobucket"></a>

[AtvKid4Eva]

^^ would you look at that! hmmm right from the HMF manual...told ya.

[2001400exrida]

i would not recommend that jetting for just a slip on. it won't run right.

[bherriman]

This is gonna be my last post on this thread, I'm not gonna get in a pointless argument. You really need to give it up, just because you think its wrong doesn't mean it is. If you look at the pictures HMF got this jetting using a dyno and I'm sure they know what they are doing. I'm not saying this guy needs a 165, I'm just saying HMF recommends it and I put it in my bros bike and it runs perfect.

[AtvKid4Eva]

haha really man? give it up. HMF dynos all their bikes and exhaust systems to come up with these numbers im sure they are close...thanks for that photo now i can stop posting on this thread because i know what i said was right.

[AtvKid4Eva]

ha sorry bherriman i posted basically the same thing right after you..just let him keep arguing. we know were right. im out.

[2001400exrida]

ignorant you are.

there is no right or wrong dude.

I'm suggesting what this guy needs to start with so i can help him because i have experience with slip ons and jetting.

I'm not going to suggest a 165 because hmf says too......that's not a smart suggestion. with just a slip on he needs somehting like a 152.

i'm sure that your hmf's with a 165 main jet are probably running aftermarket filters withthe lids off aren't you?

i'm just trying to help this guy, i dont' care what you guys think is "RIGHT" there is no right or wrong but 165 is too high for a slip on, PERIOD.

[AtvKid4Eva]

why would you not suggest the size that HMF recommends? they are a bigtime exhaust company i would believe there recommendations anyday over yours. stop posting in this thread.

[2001400exrida]

i'm here to help the person who's looking for numbers, maybe you shold stop posting, u obviously are clueless haha. do you want me to pull out a fmf manual or a lexx manual or a dynojet kit and show you what they recommend for JUST a slip on?

you're definetly not familiar with jetting that's pretty obvious.

[2001400exrida]

here's some real world numbers for you bud.

http://hmfracing.com/forums/showthread.php?t=4263

http://hmfracing.com/forums/showthread.php?t=4415

http://hmfracing.com/forums/showthread.php?t=4068

http://forums.atvconnection.com/honda/309274-05-honda-400ex-hmf-pipe.html

all day long guys all day long.

[AtvKid4Eva]

done. your wasting everyones time

[AtvKid4Eva]

for one id never run a FMF or LEXX exhaust haha so i dont care.

[2001400exrida]

Originally posted by AtvKid4Eva
for one id never run a FMF or LEXX exhaust haha so i dont care.

yeah your HMF is the best pipe ever made on earth.

screw yoshimura or sparks, you've got the best with HMF, muahahaha.

i'm trying to avoid wasting peoples time by handing this guy the correct numbers haha. you on the other hand are hellbent that HMF is just dead on right with 165-170.

read the posts that i linked you might lean something.

[2001400exrida]

let us know how it works out for you in the end duner.

[2001400exrida]

i love how bherrimen and atv kid both quit commenting when i posted the straight facts off of the hmf website forum posts haha

hilarious!

they might recommend a high setting so that they don't have anybody running lean but if you look at experience and the real world. 165 is not correct bherrimen or atv kid.

check those links i posted and you'll learn the facts.

[honda400ex2003]

Originally posted by 2001400exrida

they might recommend a high setting so that they don't have anybody running lean but if you look at experience and the real world. 165 is not correct bherrimen or atv kid.



that is correct as any other manu does with jetting. look at dj specs. they run so rich on some stuff it isnt even funny...

gotta cover the bases though, it gets expensive when people arent buying product and want you to rebuild engines that melted down from being too lean.


As i recommended at the beginning of the first page, he will have to do some plug chops and read the plug at all of the different areas of jetting. no one is going to guess it just right 90% of the time.

steve

[rubbersdown]

Originally posted by 2001400exrida
i love how bherrimen and atv kid both quit commenting when i posted the straight facts off of the hmf website forum posts haha

hilarious!

they might recommend a high setting so that they don't have anybody running lean but if you look at experience and the real world. 165 is not correct bherrimen or atv kid.

check those links i posted and you'll learn the facts.

Dude stop being such a troll. Every time you post you post like 3-4 times right in a row, you trying to get you post count up or something? not to mention the fact that I havent seen one thread you have posted in that didnt turn into an argument, even with some of the most "prominent" guys on the 400ex bored. Keep it up, you'll be booted off the forum in no time.

[2001400exrida]

Originally posted by rubbersdown
Keep it up, you'll be booted off the forum in no time.

you're not in any position to make that decision. mind your own rubbersdown.

i'm just trying to help people and when i see a recommendation that is not going to help but only make things worse. I feel the need to use my personal experience and step in and save this guy some time.

again, mind your own.

honda400ex you have jetting experience with these things, what do you think he should start with? i mean i feel like i'm the black sheep that says 165 is too big, when really if you've ever tuned these machines u know that's it's much to big for a simple slip on application, MOST OF THE TIME.

and for rubbersdown, here's a helpful thread i started with no arguments!

http://www.exriders.com/vbb/showthread.php?s=&threadid=453325&perpage=10&pagenumber=1

[honda400ex2003]

my jetting recommendation is on the first page and can also be found on the thread that i suggested for him to read over and familiarize himself with. Learning what he is doing is the key, not just going off of what someone recommends. It can be an ongoing battle for far too long if he lets it. it could be changed every day almost if he wanted. 99% of the days it will be good, the other 1% it will be great. The 2 days of the year that he has the same conditions that he jetted it for is the 1%. otherwise for every 20 degrees he could do to a different jet and redo it completely. when the humidity changes he could do it again.

steve

[rubbersdown]

Originally posted by 2001400exrida
you're not in any position to make that decision. mind your own rubbersdown.

i'm just trying to help people and when i see a recommendation that is not going to help but only make things worse. I feel the need to use my personal experience and step in and save this guy some time.

again, mind your own.
Didnt say I was going to be the one to do the booting. People get booted all the time when all their thread posts turn into nothing but arguments. Im not here to fight with you, im just sayin. You come in here with your barely 60 posts (75% of them in the last 2 days) and your telling people their "ignorant" and "dont care what you fellas think" and that everyone is wrong. Thats fine if you think that but state your opinion ABOUT THE TOPIC, NOT ABOUT THE PEOPLE WHO POST and maybe some facts and be done. In every thread I have seen you post in, you have a different opinion (which is fine) but then you just start attacking the people in the thread telling them they dont know what their talking about. Well the common denominator is you buddy. you arent making many friends here right off the bat.
Ok blah blah blah, enough with that crap lol
On a side note, I do sort of agree with you. A 165 does seem like a pretty big jump for a slip on if stock is under 150. I would think a 155 would be a good starting point. do a few plug chops and decide up or down from there. Every bike runs different by itself not to mention elevation, temp., humidity and all those other factors that will make a difference.

[honda400ex2003]

http://www.exriders.com/vbb/showthread.php?s=&threadid=445695&highlight=jetting+placement


heres the same thread again for reference to anyone who would like to look at it. 90% of these are tried and true numbers that have worked for that setup at 1500 ft at an ave of 60 degrees. see the Jets r us FAQ stuff for more details on how to change yours to match lower or higher jetting.

there are so many threads on this topic it isnt even funny. a simple search brings up so much to a with a well versed person commanding the keyboard...


/ discussion on my behalf. unsubscribed and waiting for the next one to do the same bull over again...


steve

[2001400exrida]

Originally posted by rubbersdown
Didnt say I was going to be the one to do the booting. People get booted all the time when all their thread posts turn into nothing but arguments. Im not here to fight with you, im just sayin. You come in here with your barely 60 posts (75% of them in the last 2 days) and your telling people their "ignorant" and "dont care what you fellas think" and that everyone is wrong. Thats fine if you think that but state your opinion ABOUT THE TOPIC, NOT ABOUT THE PEOPLE WHO POST and maybe some facts and be done. In every thread I have seen you post in, you have a different opinion (which is fine) but then you just start attacking the people in the thread telling them they dont know what their talking about. Well the common denominator is you buddy. you arent making many friends here right off the bat.
Ok blah blah blah, enough with that crap lol

i really wanted to let this die. but you're making assumptions and also false accusations.

I state my opinion, i don't attack others. I've stated several times in this exact thread that i'm trying to save the poster time and effort by suggesting a much closer and more accurate jet. I didn't say anybody was wrong, however it's definetly not a good suggestion for just a slip on. I'm free to say that i don't care what you guys think, there shouldn't be anything wrong with that. I also don't care how many friends i make. I was never good at math so least common denominators don't work for me chief!

I calls it likes i sees it. When i sees BS, i calls it BS. Just trying to help people based on my personal knowledge. Although i don't have many posts, i've lurked this forum for several years. I've also been riding for 12 years, this is my 4th 400ex and i currently own 2. a 2007 and a 2001 with the 416.

I know a thing or two about jetting, i also know a thing or two about know it alls. Maybe somebody had an hmf slip on with a 165 main jet, well good for them but it's not a good recommendation in the scheme of things.

I clearly state my opinions about the topics, i'm not the one who is referencing other peoples posts in seperate threads just as CJM and beherriman have (they referenced my knowledge in a completely seperate thread). I know that bherriman builds race cars, however he has a thing or two to learn about jetting the 400ex if he thinks a slip on will run a 165 main jet.

Sometimes you can't take the exhaust manufacturers word for it (just like these 2 guys have), that's just bolony from HMF in this case. Sorry that you guys feel so strongly that HMF has to be correct, but they simply aren't, it's too rich for a slip on, sorry dudes.

i have slip on, box lid off, uni filter and i'm running a 155 at the same elevation of this guy.

my 416 is a little closer to the 165 main jet deal and it's got a full system. and a 11:1 comp piston with filter and lid off.

don't pick on the new guy just because he is making valid points.

[bherriman]

Originally posted by bherriman
This is gonna be my last post on this thread, I'm not gonna get in a pointless argument. You really need to give it up, just because you think its wrong doesn't mean it is. If you look at the pictures HMF got this jetting using a dyno and I'm sure they know what they are doing. I'm not saying this guy needs a 165, I'm just saying HMF recommends it and I put it in my bros bike and it runs perfect.



I really didn't want to post on this thread again, and I'm sure I will regret it. The only reason I even got into this thread is because you claimed 4 of your friends had an hmf and you had the instructions to prove they didn't recommend a 165... ect. ( then of course you edited your post and deleted most of it) So I actually went and got the instructions out just to prove that they did in fact recommend a 165. I would like you to show me where I told him he NEEDED to run a 165, because I never gave him jetting advice. I rarely give out jetting advice on this forum because its impossible to have any sort of accuracy in your guess. I simply said it is what HMF recommended and I put it in my brothers stock 400ex with the HMF Comp. series S/O only and it runs PERFECT. Also if you read back I stated that when I had my stock carb and all the mods in my sig. I only ran a 155 main. So obviously jetting various tremendously between bikes and modifications.


Oh yea, and in another two days when you decide to throw some more fuel on the fire and dig up a dead argument, don't expect a reply back from me.

[jensenracing77]

Although i don't have many posts, i've lurked this forum for several years.
[/B]

me to. that is why i have a hard time here. i never got involved much because of bad info. i don't know why i started to post now. there is some good info here but with so much bad info it is hard to tell for an inexperienced guy to know what is true. when i get involved it just makes me look like all the others. i should have used a differant user name here than my other places.

[2001400exrida]

yeah, like i said, lots of know it alls around here, some of which recommend bad advice. just exaclty like putting a 165 for just a slip on.

there is certainly good info to be had if you ask the right people, but yeah you gotta watch some of these suggestions, or just keep reading and basically weed out the BS and try to figure out what is more obvious.

[98300exduner]

well got a new spark plug in and ran the 152 for a while and i took the plug out and it was a brownish cardboard color. im pretty sure thats a good think right? well if it is thanks to everyone helping me out and giving your opinions thanks guys!

[bherriman]

Did you plug chop like the link that Steve gave you said to, or were you just riding around? Brown is good yes.

[2001400exrida]

brown is good, sounds like you got the right jet.

aren't you glad you didn't try to put a 165 in that beast haha.