400ex Velocity Intake Installed

[cheater13]

Well after all the talk, i finally put the Velocity Intake on the 400. It's my last performance-type upgrade I'm going to do to it until it needs rebuilt. Then I'm going to go to a 416 kit but that'll be awhile.

Anyways, here are some pictures of the intake on my 05 400ex. It fit perfect on my 450r carb with zr's adapter.

http://i396.photobucket.com/albums/pp47/cheater13_photos/IMG_0239.jpg

http://i396.photobucket.com/albums/pp47/cheater13_photos/IMG_0240.jpg

http://i396.photobucket.com/albums/pp47/cheater13_photos/IMG_0241.jpg

http://i396.photobucket.com/albums/pp47/cheater13_photos/IMG_0243.jpg

The mounting bracket on the aluminum tubing needs bent alittle bit because the tube is right against the seat as you can see in these pictures. It actually slightly pushes the tube down when the seat gets put on.

http://i396.photobucket.com/albums/pp47/cheater13_photos/IMG_0242.jpg

http://i396.photobucket.com/albums/pp47/cheater13_photos/IMG_0244.jpg



Jetting Recommendations

They sent me a nice little installation paper with jetting specs on too. This is where they said to start and go from there so here's what it says:

Main Jet: Increase jet size 5 points.

Pilot Jet/Idle Mixture: With stock pilot jet, turn mixture screw an additional 1 full turn out. With a #40 pilot jet, turn mixture screw an additional turn 1/2 turn out.


I'm actually getting ready to leave and go to a shop an hour away to drop it off. I was never good at jetting even though i read all the stickies so I'll have them do it. ;)

But hopefully they jet it to nearly perfection so i notice a difference and so it'll bring my drag times down.

Tell me what you all think.

[JOHNDOE83]

LOOKS GOOD!!!

I wouldnt bring it somewhere for jetting, they will tune it with what you have or what they have laying around, I dont think a shop will hold your bike and order jets and keep trying till its right.

For about $35 or less you can jet it right at home very easily without plug chops or that plug color crap that doesnt really work anyway.

Its very easy to tune the main jet "stupid easy" actually.

As long as you have a 40 or 42 pilot your good.

you just need some main jets.

Probally only need a few.

[Blodg]

Let us know if you see an improvement. If you have drag times from before and then it will be interesting to see how much the times drop. Normally a skinny intake tract will increase air VELOCITY which improves low-to-midrange power and throttle response. For top end power you need air VOLUME which a skinny intake pipe may not supply but then again the K&N filter on the tube is pretty good size so as long as the tube is not restricting the volume of air it may be better on top and bottom end.

[400exmxracer]

Yeah, I'm interested in the results too

[RNL]

Looks good, let see how it works.

[cheater13]

Sorry John, I took it to the shop Friday. :p

But he's supposed to be calling me back today and tell me how everything's going. I'll post any noticeable results when I get it back later this week if he gets done.

Wish I could get it dyno'd before and after but there isn't one around here.

[cheater13]

Went and picked it up today.. Good and bad news.

Good: Alot more snappier low-mid.

Bad: 3/4-Full throttle it isn't gettin enough gas.

The guy from Superjuice said that I would need a full jet kit because the jets they bought weren't big enough. The jets he put it in we're a 170 main and a 58 pilot. And they did adjust my air/fuel mixture screw. He said I need probably around a 190 main.

He also said if I put the 400ex stock carb back on it'll be a lot easier to tune.. Which I'm not doing.

http://i396.photobucket.com/albums/pp47/cheater13_photos/5366F6C0-ACCB-4BA3-9340-6E086F9AECC0-1009-000000EEB36259E2.jpg


Help me out guys. Should I get a jet kit and go from there or what?

[ish416]

$110 labor and $69 (+tax) to rejet a carb??!?!?

It would be easier with the stock carb??

They are fist-f*&king you.

Have you already paid 2 hours for them to rejet it?

[cheater13]

That $69 is for a complete stage 3 jet kit.

I only paid $110 for rejecting with labor and tax included. Labor is f*ckin expensive around here.

But I need help on what I should do/buy.

[Blodg]

A 190 main seems kinda big but you can buy a main jet for $3 to $5 and it takes 5 min. to put it in yourself and go ride to see if it is better or not. To each his own but most of us wouldn't pay someone else to jet our quads. But time is valuable and that is your decision but as Ish said the comments from these guys make it sound like they don't know what they are talking about or are trying to screw you. I am surprised a shop would use a dyno jet kit?

[cheater13]

Originally posted by Blodg
A 190 main seems kinda big but you can buy a main jet for $3 to $5 and it takes 5 min. to put it in yourself and go ride to see if it is better or not. To each his own but most of us wouldn't pay someone else to jet our quads. But time is valuable and that is your decision but as Ish said the comments from these guys make it sound like they don't know what they are talking about or are trying to screw you. I am surprised a shop would use a dyno jet kit?
But wouldn't buying a jet kit be better? Just incase that certain jet that i would get wouldn't be the one. I found a kit off here:

http://www.jetsrus.com/a_jet_kit_atv/honda_450_TRX450R_2004-2009.htm

I'd assume i would get the 04-05 450r jet kit cause that's what my carb is.

And if i changed the main jet, how would i know what to change the pilot to? And where to adjust the fuel/air screw?


And here is Superjuice's website:
http://www.superjuiced.com/index.htm

[Blodg]

The size of the main jet has zero effect on the pilot jet or fuel/air screw setting. So those would not change if set correctly.

Yes a series of jets is best, I have every jet and some duplicates for 140 through 200. The dyno jet kit uses some funky sizing and I prefer to stick to the Keihin sizes.

[cheater13]

Originally posted by Blodg
The size of the main jet has zero effect on the pilot jet or fuel/air screw setting. So those would not change if set correctly.

Yes a series of jets is best, I have every jet and some duplicates for 140 through 200. The dyno jet kit uses some funky sizing and I prefer to stick to the Keihin sizes.
Yeah them he put in I'm pretty sure are dyno jets. I would like to get that kit off jetsrus but is that a good kit? Is it everything I'll need?

It runs a lot better than it did. It's just when I do full throttle, it sputters down.

[JOHNDOE83]

if its a dyno jet its probally a 195 in kehin sizes

I think thats to big for your motor possibly

if its like a early rev limiter with loss of power its to rich.

if it hesitates or kinda speeds up slowly in the topend its to lean

[JOHNDOE83]

buy from jetsrus in incriments of 5 from 170-210

pm me

and lets jet it properly ;)

then youc an pay pal me the money you would pay the shop...lol...jk

[cheater13]

Originally posted by JOHNDOE83
buy from jetsrus in incriments of 5 from 170-210

pm me

and lets jet it properly ;)

then youc an pay pal me the money you would pay the shop...lol...jk
Yeah, I'll probably end up doing that but I did find a Jetting Conversion Chart:

http://www.hawkgtforum.com/forum/showthread.php?t=3690

But will do John! I'll paypal you a few bucks if you help me get it runnin perfect. :D

Empty your mailbox though!

[Blodg]

I suspect the same as Johndoe and think it may be too rich and not too lean as the shop suggested, especially if that 170 is a dyno jet.

[RNL]

I'm wondering what effect this intake would have on a stock internals 400.

[cheater13]

Blodg: Yeah it might be running too rich but i don't know for sure. I have excellant idle - half throttle response. When i have the throttle the whole way in, it sputters and don't have any power.

RNL: I would think it would still help. Anything that helps our engines breathe better will have some type of benefit i would think.

[flint250trx]

if you are good from low to mid range with good idle i would not touch the piolit (slow) jet. I would throw a new plug in it and run it up and downt the road a few times. white or grey more fuel black too rich and lean it out

Josh

[cheater13]

Originally posted by flint250trx
if you are good from low to mid range with good idle i would not touch the piolit (slow) jet. I would throw a new plug in it and run it up and downt the road a few times. white or grey more fuel black too rich and lean it out

Josh
Guess I could try that. I wish the spark plugs weren't so dang hard to get to on these things though!


And also, I called the guy and made sure what kind of jets is in it. They're actually Keihin jets already.

[JOHNDOE83]

Originally posted by flint250trx
if you are good from low to mid range with good idle i would not touch the piolit (slow) jet. I would throw a new plug in it and run it up and downt the road a few times. white or grey more fuel black too rich and lean it out

Josh

That actually doesnt really work.

[cheater13]

I found someone that would help me out with the jetting. All I need to know is what all I have to buy?

I can't stand not riding when it's 65 out.