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400Ex_Rida
10-27-2003, 02:37 PM
I have a 400ex with complete exhaust, rev box, and k&n. How much of a difference will the 2.5mm bore make? Does anyone have it done?
Doibugu2
10-27-2003, 02:46 PM
Rico just put one on his 416, I'm sure he will respond. Not sure how much ride time he has on it.
400Ex_Rida
10-27-2003, 04:13 PM
Will it give the stock motor to much fuel?
Doibugu2
10-27-2003, 04:25 PM
No, because you can run an FCR 39mm on a stock motor. It just has to be jetted properly.
400Ex_Rida
10-27-2003, 04:30 PM
Im not planning on building the motor so it seems like the cheaper way to go, instead of buying an edelbrock or fcr
400Ex_Rida
10-27-2003, 04:35 PM
will a bigger or smaller main jet be needed. I have a 155 right now
Doibugu2
10-27-2003, 04:50 PM
Sorry can't help with that.

But these are questions you should be asking Sparks. That is part of what you paying for.
10-27-2003, 04:51 PM
they jet that mofo for u
10-27-2003, 05:49 PM
I"M running the same jetting as my stocker in my sparks carb..:eek2:

Yes it offers power gains but not as much as a FCR or edelbrock. I had very little if no adjustments to make except for the main jet. I bought the carb used from the admin on the site. He pulled it off his 416ex and it was dam near perfect on mine...:cool:

PS..rocky ridge racing does the same carb bore for $50 less...:macho
pnut420
10-27-2003, 06:51 PM
Originally posted by Rico
I"M running the same jetting as my stocker in my sparks carb..:eek2:

Yes it offers power gains but not as much as a FCR or edelbrock. I had very little if no adjustments to make except for the main jet. I bought the carb used from the admin on the site. He pulled it off his 416ex and it was dam near perfect on mine...:cool:

PS..rocky ridge racing does the same carb bore for $50 less...:macho

That a good honest answer man. Cant you just get a carb of the new 400 since it is 38mm and be almost where Sparks is:confused:
10-27-2003, 08:32 PM
nope...the new 400ex doesnt have a 38mm carb...that was a miss type...according to everyone i have talked to
10-28-2003, 07:18 AM
Originally posted by pnut420
That a good honest answer man. Cant you just get a carb of the new 400 since it is 38mm and be almost where Sparks is:confused:


Yeah that was a crock of chit.. Typo on honda's part. Part numbers are the same so it's the same carb as it's always been.:ermm:
400Ex_Rida
10-28-2003, 07:54 AM
Thanks for all your replies