[Virge]

Virge, with the top AND sides cut, especially like Honda has you do it, you're gettin a little more air than we are. Try 1 and 1/4 out on the fuel screw, that may fix the cold to start thing. Let me know how that goes. Doug

THanks Doug, I'm also thinking that I may not have screwed the FS all the way in. With the spring on it I didn't want to really torque it in. Should I just really screw the thing in until it stops then go out 1 1/4 turns?
virge

[[email protected]]

First make sure it's all the way in, then unscrew it to the recommended 1 and 1/8th. If it still does the same thing, back it out another 1/8th.
I know what you mean, you dont want to strip it out. Just turn it in until it seats, don't force it. Doug

[Virge]

First make sure it's all the way in, then unscrew it to the recommended 1 and 1/8th. If it still does the same thing, back it out another 1/8th.
I know what you mean, you dont want to strip it out. Just turn it in until it seats, don't force it. Doug

Got it dialed, man she runs like a bat outta hell, The horse trail is getting torn up though so I better get out to Gorman soon.

I went out on a litle evening cruz, that light doesn't do so bad.

Thanks for the help.

[HotLap]

2005 450X 4000 ft.

JD kit 165 main with red needle in 4th position
Applied Engineering smog eliminator kit
Applied Engineering crank case re-routing kit
Twin Air power flow kit
Airbox side vents cut out & snorkle removed
Pilot screw out 1 1/8 - 1 1/4 turns

[mustang]

OK it seems everyone likes the JD jet kit , now for those of us who know , you don't need a 70 dollar box of jets and two needles that you are only going to use 1 of each .
The 450X runs like a rocket without the JD Kit also . You just have to be patient and start small to get where you want to be .......keep reading and I'll show you how to set up your X for the price of the exhaust componets only .

1. Cut the top off the air box ....don't be shy make a big hole .
2. Cut open the "vent in the air box door .
3 replace filter with new , or clean , or buy a new twin air filter for 30 bucks .
4. Leave the fuel screw at 1 1/8 turns (stock setting)
5. replace main jet with a 170 mine is equal to about 172 (Ijust opened it up with the right size main jet reamer .)
6. leave the stock pilot jet in (42)
7 Using the STOCK needle set the clip in the 4th notch from top .
8. Buy a good free flowing exhaust .

you are done the bike will run like a two smoke with a tractor bottom end !

Total cost to rejet = ZERO (but you do need a reamer set to open the stock main jet)

Ever wonder what the #'s on a main jet mean ?
it's simple
a #100 is 1 mm diameter hole
a #142 is 1.42 mm
a #170 is 1.7 mm
#200 is 2 mm , and so on it goes
If you haven't modified your air box or exhaust I would start with around a 150 main jet and move needle to 3rd clip and see how it does .
Here's a good tip if you whack the gas and are not sure of which way to go with jetting , bigger or smaller , pull the choke on while riding and if problem gets better you need a bigger main jet , if it gets worse you have to go smaller on main jet . It aint rocket science but can be frustrating these hondas are easy to jet , try doing a multi cylinder street bike that has been heavily modified . four carbs to screw with and set can be a total nightmare !
a 150 will be a good increase for a stock bike and will probably get rid of the X's throttle bog for you .
My X is dialed in perfect with the following setup :

FMF Power Bomb Headpipe
FMF Q2 Exhaust
Big Hole in top of air box
Twin Air Filter with the backfire cage still in it !
172 Main jet
42 pilot jet
Stock needle set at 4th notch
Fuel screw at 1 1/8 (stock)
pink wire mod
VP c112 race fuel
Re Routed crankcase breather

My altitude and temp is basically sea level with temps 50-90 degrees
The X is a non california bike , with these mods she starts with a quick push of button maybe only spins 1 or two revolutions and will lite right off . choke is off after just a minute and it pulls like a freight train on steroids. NO bog , No hesitation pulls hard right from idle to rev limiter , if it didn't break up on rev limiter this beast would still make power way past redline !

c-ya****mustang

[[email protected]]

That's all good, but all of us aren't " those of us who know".

In my case, I'm pretty good at a lot of mechanical things, for instance I can lace rims ! Jetting, on the other hand, is something I've never been in to very much.

It's no five minute job to change needles in any 250/450X.

In my case, I routinely work 50-60 hours per week, and words can't describe how little interest I have in "starting small" and working my way up, down,sideways, or whatever, experimenting with different combinations. I don't have the time or desire.

When I first got my first JD kit and my KTM ran perfectly, to me it was worth whatever he charged, 60 bucks or 200. Also, the comment that the kit is "a box of jets and two needles" isn't correct. It's not correct either that only one each is going to be used. It includes a high altitude/cold weather needle, and every main you can possibly need while changing for the engines needs for just what you were talking about, different exhaust, air cleaners, temperatures and altitudes ,etc.
It also comes with GREAT directions and pictures, for those of us who -don't know.Everytime I've needed to change something because of an add-on the answer was either in the directions, or an e-mail away , and he has hit it on the money every time,KTM or Honda. That,too, is worth something.

I think the way you put it minimizes the R&D abd service the guy puts into what he sells, and as far as satisfied customers go, when have you ever heard of so many completely satisfied customers, especially when you consider the need being addressed is as complex a subject as jetting on a whole lot of different bikes ?I've been in this sport a long time, and have never seen such a performance home-run, for that kind of money.

This guy also personally returns e-mails, try that with FMF, ProCircuit, etc. I think it's a GREAT product, and for the money it's a great deal. If all companies in this sport had the kind of service guys like JD and Ken do, this would be a lot better sport than it is.

It's great you're happy with how your bike runs,it's the only time I've ever heard of anyone running a 170 main , with a stock needle in any position, and been happy.It's also the first time I've read of good results with just the top of the air box off, unless it was also angled down front to rear , unless it was also removed down some distance from the top. The seat fits pretty tight.

In my case, I'll spend the 60 bucks, do the one time install, and be very,very happy about not doing the "jetting process". And when I get another bike, if it comes lean, and I know it will, I'll be installing one of his kits as soon as I get it home, like I did this time.Who knows how long it will take with internet searching until someone tells those of us who don't know how to fix their bike ? I'll pay the 60 bucks. Doug

[mustang]

Are you sure you don't get a kickback on JD Jets , LOL
Don't be so serious man .
A main jet change on this bike takes under five minutes , it couldn't be easier . go back and read .....make a big hole in air box and side too .and its a 172 main not 170 needs the fuel for all the xtra air it sucks . also the exhaust is not stock .it is more of the "R" exhaust it suffered a small loss of torque for huge gain in top and middle.
I agree that kind of service you speak of is outstanding . Me I like to experiment , different strokes for different folks .
wanna race for pink slips ? HUMOR DOUG , don't blow a gasket !
c-ya****mustang

[[email protected]]

I'm not TOO serious bud ! Sorry .
Hey, I respect you guys who LIKE to jet, I sure dont .
Hey, a drag race would be fun . Not for pinks though, your tuner a.. would have nitrous or some other evil trick ! Doug

[mustang]

actually maybe a blower , nitrous is to violent at WOT.
nah......... the bike is just fine for tight NH woods trails .
She has developed a healthy appetite though for fuel . New unmodified I would get about 60 miles b4 reserve now I suck up 2 gallons in around 50 or so but it is usually ridden pretty hard .
What kind of life are you getting out of chain and sprocket .
I'm looking at one of sidewinders tri-metal sprockets saw a ad in Dirt Bike for $79.95 and in that same issue that's what they have on their X and seem to imply that it wears like iron .
c-ya****mustang

[[email protected]]

Our gas mileage both took the same dump ! Oh Well.
My stock driveline stuff is still good with the stock stuff, I've just gone over 30 hrs. on the bike.I'm beginning to see wear though and know it won't be long.
The Sidewinder stuff is supposed to be good, but I've heard a LOT of unhappy customers of theirs for one reason or the other.
The IronMan/DirtTricks stuff i've only heard good about though,and I'll probably go that way. Ken sells them here,too.
Let me know what you find out.
Blower huh ? Well that figures. You'd probably show up running the blower with like a 500 main jet ! Doug

[mustang]

You know that the future is going to be fuel injection for dirt bikes too ! Most all of the street bikes are coming fuel injected from honda shadows to triumph speed triples , even Hardly Ableson is doing fuel injection now , then all us tuner boy types will need for the dirt bike is a laptop to remap the fuel and timing curve .
In fact I have played with the power commander you can put on fuel injection bikes and you can tune every parameter for peak torque and power a lot easier and better than playing with tapered nails and brass plugs with a hole thru it . sounds primitive doesn't it . I say bring on the fuel injected dirt bike . If you screw up you just reload the last map that worked for you .
c-ya****mustang

[paul turner]

C'mon guys,

let's get more set-ups in this post.

paul

[[email protected]]

Paul. It's because our JD kits work so well, what's to post, bro ?
What's the matter,man ? Popping and back-firing got you down ?
Just give up and join the cult. You may feel "dirty". but it'll pass.... The tan plugs,but with 165 and 170 mains and no more popcorn machine sound..it'll make it all worthwhile ! There is a clear pattern here...Doug

Got it dialed, man she runs like a bat outta hell

Virge

Throttle is response better than many two strokes!!!

BDude

JD kit 165 main with red needle in 4th position

HotLap

[Scott Wilson]

I just bought my two oldest boys 250 rs they are the 05 model do i need to rejet these? they seem lean out of the box like my 450x I dont have plans for pipes or anything yet as the kids are 115 lbs or so.

[[email protected]]

Scott, are they 'R' models or 'X's ? Doug