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Discussion Starter #1
I was wondering if anybody has put the crf carb on the trx. I need some help getting this thing dialed in. I am currently running the stock exhaust with a open airbox lid. I have a 172 main, 45 pilot, and the air screw is 2.5 turns out. Any help is greatly appreciated.
 

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You might PM Rico'450R, he has a FCR carb on his quad.
 

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Originally posted by Brian22@May 13 2004, 08:56 AM
I was wondering if anybody has put the crf carb on the trx.  I need some help getting this thing dialed in.  I am currently running the stock exhaust with a open airbox lid.  I have a 172 main, 45 pilot, and the air screw is 2.5 turns out.  Any help is greatly appreciated.
I think you will have to jet up on your main....172 is a bit to small.
 

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Brian22, I'm running a 160 main and a I think 42 low on it
I'm going home for lunch today and I will get the spec's for the carb and the cam.
I'm running a 2 stage Hotcam, CRF39 carb, and a slip-on pipe! I will post about 1pm pacific time.


TRX450R spec's

Stage 2 Hotcam
Intake
Lift: 10.1mm
Lobe Center: 109.75
Duration @ 1mm: 248
Valve Lash: .15mm

Exhaust
Lift: 8.7mm
Lobe Center: 105.5
Duration @ 1mm: 268.5
Valve Lash: .28mm

FCR39mm Keihin Carb with Hotstart and TPS
Main Jet - 160
Slow Jet - 45
Needle - OCEMR#3
Mixture Screw - 1
Main air jet - 200
Slow air jet - 100

I also ran a Pro Circiut pipe Titanium slip-on With no air box lid and a UNI filter!!
There it is, enjoy and I hope your bike runs as well as mine!!!!! good luck!!!!
Honda Forever!!!
On the Hotcam box it said CRF450 02-04, so I think it has the same spec's as the CFR cam!
'And yes the 2 stage cam gives you that seat of the pants feel!!! with no doubt!!!
Like I said 3rd gear is unreal!!!!!!!!!!!!
 

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Originally posted by Rico'450R@May 13 2004, 10:59 AM
Brian22, I'm running a 160 main and a I think 42 low on it
I'm going home for lunch today and I will get the spec's for the carb and the cam.
I'm running a 2 stage Hotcam, CRF39 carb, and a slip-on pipe! I will post about 1pm pacific time.
are you running no air box lid?
 

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Brian22 jetting FCR40 and FCR39 are going to give you 2 different results.
Joe
 

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Discussion Starter #7
Im currently running without the airbox lid. It seems to run fine on top, but with it sitting there idling it sounds as if it has a miss. I am just wondering if my pilot is a little bit to big. If I just barely blipe the throttle and let up it starts to run rough. I have a 42 pilot and I am going to try that. Thanks for all the help.
 

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Discussion Starter #9
I was just going to tell that I got this dialed in. Man does this carb make a difference. The throttle response is unreal. TRX all the way.
 
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