Which is better 04/05 carb 0r 06+ carb? - Honda TRX Forums: Honda TRX 450R Forum

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Old 06-11-2010, 01:48 PM   #1 (permalink)
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What size is the 04/05 carb and what size is the 06+ carb? Which one is better?
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Old 06-11-2010, 03:04 PM   #2 (permalink)
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Bore the 06+ carb and it has better acceleration.
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Old 06-11-2010, 03:35 PM   #3 (permalink)
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04/05 42mm
06+ 40mm

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Old 06-11-2010, 04:37 PM   #4 (permalink)
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Thanks for the help baileygunns and dyechainsaw.
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Old 07-31-2011, 10:34 PM   #5 (permalink)
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I have a question about 05/06 carbs as well.
I have an mx 05 trx450r w/ 13.5.1 sparks piston, sparks exhaust, stage 2 hot cam, and I swapped out the 05 for the 06 carb that was on the first bike(06 that was having problems)
My questions is if I swapped back to an 05 carb, how much if any difference would there be in performance?
The only reason I'm thinking of doing this is I have two bad wrists(broke them when I was younger) and get terrible arm pump within 3-5 min of riding. I let a friend of mine borrow my 06 carb to go to a national race as his started sticking the day before he left... and he says it was all he could do to hold on after a few laps and he never gets arm pump.
This is what I think maybe a last resort as I've tried everything I can think of from working out my hands and wrist to spending stupid amounts of money trying to get my ike better setup... any help would be great. Thanks.
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Old 08-01-2011, 01:08 PM   #6 (permalink)
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performance wise the the FCR carbs (06+) have a better throttle response than the keihn (04/05) carb . As far as your wrist issue there is a link in this section on how to make the fcr carb easier on the thumb bye modding the spring. A good antivibe stem and som flex bars will help you alot too.

Was in Engine tech faq section
FCR Throttle Spring Mod
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Old 08-03-2011, 03:29 PM   #7 (permalink)
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i put a fcr on my 04 and the throttle response was better but it killed my power so i switched back to my stock 04 carb
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Old 08-03-2011, 03:43 PM   #8 (permalink)
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alot of the GNCC guys swap to the older 04/05 carb.. i assume for the low end power gains? dont quote me
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Old 08-03-2011, 09:44 PM   #9 (permalink)
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Kyrider - How much power did you lose? Do you think boring the stock 04 carb show an improvement?
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Old 08-03-2011, 10:44 PM   #10 (permalink)
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my et times in drag went from a 3.8 to a 4.2-4.3 when i switched to the fcr carb, i think if you bored the fcr out it would be wayyy better than the stock carb
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Old 08-03-2011, 10:49 PM   #11 (permalink)
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I feel the FCR is better. People say they are harder to work on, or they need constant tuning. I disagree with any of that. But..... it all depends on your build and what you race.
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