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04EX
03-27-2005, 09:06 AM
Ok i want to get more throtle response out of my 400. I already have WB E sereis slip on. If i do the head pipe, jets, and air filiter will that make a difference in throttle respone? Any other suggestions?
EvilJester400EX
03-27-2005, 09:07 AM
That won't increase throttle response. Just buy a Sparks timing advance key.
chucked
03-27-2005, 09:26 AM
More compression will give you more throttle response.
cals400ex
03-27-2005, 03:20 PM
a sparks timing key or the aggressive curve gt thunder rev box will both help. i don't run the key but my good buddy does. on my bike i run the gt thunder rev box and it made a very noticable difference in throttle response.
04'400ex'er
03-27-2005, 03:26 PM
You can remove the choke also for throttle response but it doesnt work miracles. I would do that and get the timing advance key and you will be happy.
Plante400
03-27-2005, 07:08 PM
bigger carb:D
YFZ450Ridr
03-27-2005, 07:53 PM
what all companies make a rev box that wont blow a hole in your wallet?
04EX
03-27-2005, 09:41 PM
Well doesent a rev box just let my bike rev to a higher RPM??
dork
03-28-2005, 01:01 AM
i believe the gt thunder one has a different advance curve as well.
Freestylemxr
03-28-2005, 04:59 AM
My friend has a edelbrock 440 carb, advanced timing key, rev box, cam, piston, and all that good stuff and he still dosnt have great throttle response, i think its just 400ex's in general
04EX
03-28-2005, 09:54 AM
i was fine withs its response untill i rode my buddies Raptor 660 that had a full exhaust, jetkit, intake. lol
cals400ex
03-28-2005, 11:12 AM
gt thunder has 2 different boxes for the 400ex. i have the hotter curve box from him and it makes a pretty big difference in throttle response. if you go to a larger bore bike like the yfz or raptor, you may gain better throttle response than the 400ex. i am not sure. the edelbrock carbs probably make the 400ex have worse throttle response than stock since it has a very long throttle throw. the fcr 39 and 41 carbs will drastically increase throttle response.
04EX
03-28-2005, 10:34 PM
ok so if i where to get the hotter curve box would i lose any reliablity?
cals400ex
03-29-2005, 11:44 AM
Originally posted by 04EX
ok so if i where to get the hotter curve box would i lose any reliablity?


you shouldn't have any problems with that box. my bike does idle a bit irratic and isn't as smooth as stock but there is always give and take when it comes to these things.