what is everyones jetting?

[bigfoot300ex]

I just wanted to see what everyones jetting was and what exhaust,airbox mods they had
I have a slip-on LRD with no airbox lid and a k&N
and a 190 main jet but i think im going to a 200 because it is burning too lean.To me this is really weird b/c the stock was a 118 i think
anyone else running this high of a main jet?

[KEVIN132]

runnin hrc kit and k and n im runnin 180 main:D

[wvspeedfreak]

HMF slip on,no lid,twin air filter....175 main.

[dirtriderex]

with HRC and sparks pipe I run a 195

HMF slipon with lid and stock airfilter....128 main

[450 Racer R]

TC racing, K&N, no lid, 162 main with hrc needle on third clip

[zawetzel13]

my quad has an 04 CRF450 dirtbike engine with Yoshi full titanium with K&N no airbox. runnin 200 main and 155 pilot and i think it's still a little to lean. have u done any engine work?

[DirtDevilBT]

Wrong:D

[Sportrax10]

Sparks pipe, no lid, Sparks filter kit, 190 main...

[macsolocam]

What is everyone running with the fcr carb setup?

full exhaust
no lid
cam
piston
maybe ing. mod?

tks
macsolocam.

[bigfoot300ex]

Originally posted by zawetzel13
my quad has an 04 CRF450 dirtbike engine with Yoshi full titanium with K&N no airbox. runnin 200 main and 155 pilot and i think it's still a little to lean. have u done any engine work?
no motor work........yet

[National#6]

Depends what elevation you are running at. I run a 200 Main and a 52 pilot at 31/2 turns out in 60 deg weather with a modified motor at 4600' elevation.

[1_bad_450r]

With HRC and HMF slip on, I run a 190.

_______________
450R

HRC kit, HMF slip on, K&N, Razor MX rear, Holeshot front, nerfs, graphics kit, renthal handle bars

[1_bad_450r]

With HRC and HMF slip on, I run a 190.

[dtmichau]

thats definately one thing ive heard about the 450r's, that the jetting was crazy on them. I about to install a Full system LRD pipe, stage one hotcams and K&N filter without the lid. I was wondering where you guys think i should start jetting at? 180 and work my way up?

Ill have my quad put together by the beginning of april hopefully so ill be able to enter it in the quad of the month for the april contest :)

[red2004 TRX450R]

[i] I was wondering where you guys think i should start jetting at? 180 and work my way up?
[/B]

I see on here lots of people staring out low and working up in jet size.

I have to say that is the wrong way to do it. You should start out rich and work down in jetting!
It’s better to start out little rich that start out a little lean.
Lean conditions are a LOT worse for an engine than being a little rich!
Being lean cause things like detonation, over heating, melting of stuff etc.
Being rich cause oil to wash off the cylinder walls and failed plugs. But takes a lot longer to hurt the engine!

Yes leaner is meaner! But at what cost!


Some one back me up on this !!!

[kargaaro]

agreed.

HMF slip on, no lid K&N, 180 Main, MI

[TRX250R87]

'05 450R with about 20 hours on it at 25*F...
-HRC cam
-stock pipe and 2" end cap
-stock 48 pilot
-air screw about 2.5 turns out
-HRC needle middle position
-190 main

Not sure how "dialed in" I am, but with my GPS I was able to get a few more MPH than with the 182 main. With stock unstudded tires and 14/36 gearing, I was able to get 72.5 MPH on the ice. I think I should be able to get faster than that though!
ERIC

[wvspeedfreak]

Originally posted by red2004 TRX450R
I see on here lots of people staring out low and working up in jet size.

I have to say that is the wrong way to do it. You should start out rich and work down in jetting!
It’s better to start out little rich that start out a little lean.
Lean conditions are a LOT worse for an engine than being a little rich!
Being lean cause things like detonation, over heating, melting of stuff etc.
Being rich cause oil to wash off the cylinder walls and failed plugs. But takes a lot longer to hurt the engine!

Yes leaner is meaner! But at what cost!


Some one back me up on this !!!
I agree with you to an extent.However,I also think there is a little superstition in jetting.You are not going to melt your engine as quickly or easily as some say just by being off a couple of jet sizes.

[TrxTex]

I was having the same problem but I put the HRC needle in at the middle position and a 190 is working for me. Im guessing the stock needle is the bottle neck. I tried a bunch of sizes up to the 200 and it was still too lean. Not anymore. Either move your clip down on your stock needle a few clicks or get an aftermarket one. I at 3600ft most of the time.

[red2004 TRX450R]

Originally posted by wvspeedfreak
I agree with you to an extent.However,I also think there is a little superstition in jetting.You are not going to melt your engine as quickly or easily as some say just by being off a couple of jet sizes.

YA It would be hard to MELT it. but with high compression and lean jetting it will detonate/ knock!

I can show a pix of a small block chevy piston that was knocking, it looks like some one took a shot gun and shot the top of the piston!!! the reason it happend thow was to much compresion, to much timming, to lean carb, and to low of octain for the combo!!

[mountainman_270]

Im running TC full pipe, 175 main, stock filter, cut box lid, stock 48 needle, air mixture screw 3.5 turns out. This is TC recommendations although it "seems" lean compared to all other pipe systems, it runs well and shows no signs of being lean.

[mountainman_270]

And oh, I almost forgot, HRC needle on 4th position!!

[sulnz450r]

I have white bro. slip on
ehs racing lid
180 main !

[911]

fmf slip on and no lid i tried a 190 main and felt it was MUSHY in the spread so i went to a 180. much crisper. it's cold out so i don't tack it but come warmer weather it should be perfict. try some dif jets and go by the seat feel and check the plug:D

[450r#221]

Im running a 195 main,50 pilot,4th clip on HRC needle,2.5 turns out on screw with full Sparks exhaust,filter,HRC kit

[chad502ex]

Originally posted by 450r#221
Im running a 195 main,50 pilot,4th clip on HRC needle,2.5 turns out on screw with full Sparks exhaust,filter,HRC kit

i ran the same as your setup before my 530 except 3 turns out

huh

[450r#221]

Seems to work pretty good:macho

[R_rocket]

full system ducan fat boy
hot cams stage 1
no air lid
stock air fiter (i took out the screen in the air filter)
main jet 175

[03GNCC270]

BIG GUN SLIP ON
HRC NEEDLE 3RD CLIP
168 MAIN
WITH CUT AIR BOX LID.
STOCK FILTER

[Grizzly450R]

i run a 128 w/ a Bill Ballance(HMF)

[New450r]

I so far still have the stock exaust but cut the lid in the back and glued an outerware screen and rejeted to 178 and works great but all quads are different

[450R_lover]

HMF Bill Ballance Carbon full system, Hotcams Stage II, K&N, No Lid..... With dynojet kit 175 mj, 50 pilot, dynojet needle on 3rd clip?? i think

[mattonln]

I run 175 main, needle in 3rd clip

HMF slip-on
No Lid
K&N w/outerwear.. i also removed all snorkels on airbox and crap

my uncle runs a 190 with...
LRD full
HRC cam
K&N and no lid

[middleman102002]

i would love to post what my jetting is but the truth is i have no clue the dealership i bought mine from changed the jetting for denver (5280 feet)

then they went out of business and i didnt ask what the jets where before they went out of business

anyway i was wondering what i should run at a mile high with
White Brothers Pro Series Carbon and K&N

thanks

oh yeah im also running 100 octane fuel cause all we have here is crappy 91 octane with 10% ethanol unless you buy the 100 octane they have a some gas stations

[Mxracer53]

I have a Sparks exhaust and air filter with sc ring no lid and a 185 main

[DirtDevilBT]

Originally posted by middleman102002
oh yeah im also running 100 octane fuel cause all we have here is crappy 91 octane with 10% ethanol unless you buy the 100 octane they have a some gas stations

GO BRONCOS!!!!!!!!!!!!!!!!!!!!!!!!!

I feel yeah. Califonia has 91 super oxygenated stuff. Wont have to worry about all that after the piston install. lol

Hmf
02 CRF cam
UNI lidless
Dyno Jet needle pulled up one from middle
48 pilot 3 turns out
165-170 dynojet mains in high desert to low mountains
210 at Glamis---never checked plug tho, worked

Feels good, never have had time to check, never had fan come on either, lol. I'M HELPFULL, YES SIR!:p

[middleman102002]

[QUOTE]Originally posted by DirtDevilBT
[B]GO BRONCOS!!!!!!!!!!!!!!!!!!!!!!!!!

you a broncos fan

anyway yeah the gas really sucks as soon as ppl on ebay stop screwing me over im gonna buy a 11.5 piston so i can run better gas

[dysfunktinal]

i live in utah and i run no box lid, k&n, full yosi system amd i run a 170 main jet. Stock was a 112 :)