2005 Trx450r mods and jetting questions - Honda TRX Forums: Honda TRX 450R Forum
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post #1 of 18 (permalink) Old 05-08-2010, 08:35 PM Thread Starter
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I have a 05 450 with a hot cams stage two camshaft, k&N air filter, DMC full exhaust, and no airbox lid.. What jet brand should i use (Dynojet, Kehin, ect.)? and what size should i start at? Any help would be greatly appreciated.

I have been confused on jetting because many people say that the different brands have different size inlets even if they have the same jet number.

Thanks..

2005 Trx450r
12:1 comp
Uni filter - lid on with 4 vents
Sparks exhaust
Stage 1 HC

2007 crf450r
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post #2 of 18 (permalink) Old 05-08-2010, 08:59 PM
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185 keihin
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post #3 of 18 (permalink) Old 05-08-2010, 09:25 PM
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Just get with woodward and tell him you need the hrc jet kit with 50 pilot unless you already have new pilot and hrc main needle then yeah 185k

05 450R
Terry Design Concepts Full exhaust
Jetted
EHS Airbox Lid
Stage 2
Working on shock rebuild
Hiper Tech 3s
Razr on back Razr2 on front
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post #4 of 18 (permalink) Old 05-08-2010, 10:56 PM Thread Starter
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do i need to put the needle on a new clip or adjust the air/fuel screw?

2005 Trx450r
12:1 comp
Uni filter - lid on with 4 vents
Sparks exhaust
Stage 1 HC

2007 crf450r
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post #5 of 18 (permalink) Old 05-09-2010, 12:56 AM
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Best thing for you if you can afford it would be the full HRC kit. It comes with a GREAT camshaft and the airbox lid and a set of Keihin jets and a needle. If you cant afford the full kit with the cam, just get the HRC jet kit. Chuck the 185 main, 48 pilot, set the needle in the middle, turn the screw 2.5 out, and it should get you VERY close.

I run dynojet kit because I bought and installed it before I knew better. It took some work and trial and error but I got mine DIALED PERFECT on the jetting. However if I had to do it again, HRC jets all the way.

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post #6 of 18 (permalink) Old 05-09-2010, 03:08 PM
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Hey Juice...

just out of curiosity... and for all those Dynajet people on the Org...

what jetting did you end up with?

**06 450ER**... #3 (Dale lives on)

86TRX250R (mostly stock 66mm bore x 72mm stroke) **for sale**
86TRX250R (ESR310 72.5mm bore x 72mm stroke '298cc' fully modded) **SOLD**
88TRX250R (ESR330 77.5mm bore x 74mm stroker '345cc' fully modded)

HRC kit (all but gone)
Hot Cams stage III
Okie porting w/ATP CV4 springs (36mm Ti/31mm)
Venom/KBR N2O Porting w/KW springs (37mm/31mm)
Venom/KBR 487 100mm 14.25:1 piston
Cold Fusion Nitrous**
Venom 'QP' pipe
ESR Pro Series pipe
ESR modded intake w/RAT stack
42mm Taper-Bored FCR
Direct Drive clutch lockout, CR500 springs
GT Thunder-Link w/Durablue Lowering Link
Durablue Anti-Sway Bar
Modded shock mounts
Rage Modded Tranny

Jetting/Carb: #168, #45slow, NGPR needle 3rd clip, #55 Leakjet, Pilot 2 turns out.
Jetting/N2O: 22N/21F (22hp)

*STU Comp Cut 21x12x8 (6) paddle 'Padla Brats' on Douglas Blue label 8x8.....

Thanx to: Venom/KBR (Mixxer/Kam), Rage ATV (Dee), Sredum (Chris), and many ORG members
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post #7 of 18 (permalink) Old 05-10-2010, 03:09 AM
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2005 450r.

12.25 Venom, HC2, Rossier pipe, no airbox and QuadWorks K&N knockoff w/ outerwear.

Dynojet plug in air bleed
Stock pilot.....i dunno what size it is to be perfectly honest...
Dynojet needle, one clip richer (down) from middle

I bounced between a 185 and 170 main. IT ran good with the 180/185 but hit a false rev limiter up top....too rich. I backed off until that went away and ended up at 175. Its just a shade rich at my elev but I go to sea level ro race frequently and it works great. I could prolly go to a 165/170 and be great. Dynojets instructions put me waaaay to rich. So rich it wouldnt rev past about 4000rpm before it choked and farted on itself. In fact im going up to St Anthony later this week for a weekend for dune thrashing at 5200ft. Ill take my kit and see if the 160/165 runs good.

Also, am I right in hearing that these 450's run a bit faster with the a/f on the slightly leaner side? Anyway here is a chart I found for converting jet sizes...


Width------Keihin # -- DynoJets # -- Mikuni #

0,0540---- 140--------- 130--------- 121,9
0,0550---- 142,5------- 132--------- 123,8
0,0560---- 145--------- 134--------- 125,6
0,0570---- 147,5------- 136--------- 127,5
0,0580---- 150--------- 138--------- 129,4
0,0590---- 152,5------- 140--------- 131,3
0,0600---- 155--------- 142--------- 133,1
0,0610---- 157,5------- 144--------- 135,0
0,0620---- 160--------- 146--------- 136,9
0,0630---- 162,5------- 148--------- 138,8
0,0640---- 165--------- 150--------- 140,6
0,0650---- 167,5------- 152--------- 142,5
0,0660---- 170--------- 154--------- 144,4
0,0670---- 172,5------- 156--------- 146,3
0,0680---- 175--------- 158--------- 148,1
0,0690---- 177,5------- 160--------- 150,0
0,0700---- 180--------- 162--------- 151,9
0,0710---- 182,5------- 164--------- 153,8
0,0720---- 185--------- 166--------- 155,6
0,0730---- 187,5------- 168--------- 157,5
0,0740---- 190--------- 170--------- 159,4
0,0750---- 192,5------- 172--------- 161,3
0,0760---- 195--------- 174--------- 163,1
0,0770---- 197,5------- 176--------- 165,0
0,0780---- 200--------- 178--------- 166,9
0,0790---- 202,5------- 180--------- 168,8
0,0800---- 205--------- 182--------- 170,6
0,0810---- 207,5------- 184--------- 172,5
0,0820---- 210--------- 186--------- 174,4
0,0830---- 212,5------- 188--------- 176,3
0,0840---- 215--------- 190--------- 178,1
0,0850---- 217,5------- 192--------- 180,0
0,0860---- 220--------- 194--------- 181,9

The Myth, The Legend, The Man-Child..There can be ONLY one, JUICE....

04-05 Service Maunal, click here!!!

Thanks:
Mrs. Juice
Mixxer
Venom Performance
HogNutz Racing
LR Motorsports
Daryl Rath / Rath Racing

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post #8 of 18 (permalink) Old 05-13-2010, 01:57 PM Thread Starter
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As of now, my carb is 100% stock, my elevation is roughly 1200ft. so does the 185main, 50 pilot, fuel screw 2.5 out and needle on middle still sound good?

2005 Trx450r
12:1 comp
Uni filter - lid on with 4 vents
Sparks exhaust
Stage 1 HC

2007 crf450r
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post #9 of 18 (permalink) Old 05-13-2010, 02:18 PM
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sounds good, but i'd just put a hrc jet kit in it.


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post #10 of 18 (permalink) Old 05-14-2010, 02:09 PM Thread Starter
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im confused, i thought the HRC jet kit came with that?

2005 Trx450r
12:1 comp
Uni filter - lid on with 4 vents
Sparks exhaust
Stage 1 HC

2007 crf450r
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post #11 of 18 (permalink) Old 05-14-2010, 10:31 PM Thread Starter
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thaks for the help

2005 Trx450r
12:1 comp
Uni filter - lid on with 4 vents
Sparks exhaust
Stage 1 HC

2007 crf450r
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post #12 of 18 (permalink) Old 05-17-2010, 07:12 AM
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Quote:
im confused, i thought the HRC jet kit came with that?[/b]
it does but you get the needle. which makes quite a bit of difference.


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post #13 of 18 (permalink) Old 05-17-2010, 02:57 PM Thread Starter
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sorry for all of the questions, but is there any power gains on buying the hrc jet kit?
I'm real tight for money..

2005 Trx450r
12:1 comp
Uni filter - lid on with 4 vents
Sparks exhaust
Stage 1 HC

2007 crf450r
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post #14 of 18 (permalink) Old 05-22-2010, 08:28 PM Thread Starter
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talked to my local honda shop and ended up getting the HRC Jet kit. It came with the 185 main and the new needle. the guy i talked to said that o did not need a new pilot jet, but i thought i needed a 50 pilot or somthing bigger. What do you think, i haven't rode it yet, i will tomarrow though(hopefully)

2005 Trx450r
12:1 comp
Uni filter - lid on with 4 vents
Sparks exhaust
Stage 1 HC

2007 crf450r
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post #15 of 18 (permalink) Old 05-24-2010, 07:56 AM
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yea you may need to bump it up to a 50


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