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Chet
03-08-2009, 10:02 PM
I purchased a new 07 leftover 400ex, i did the following so far, HMF slip on, Uni air filter 8-1" holes in the air box lid, 42 pilot & 162 MJ. I want to kick it up a notch in power, a mod or 2, what would most suggest.
03-08-2009, 10:04 PM
cam
matt14c
03-08-2009, 10:06 PM
If still stock bore. I heard the Curtis Sparks timing key advance is an awesome and inexpensive mod.
Chet
03-08-2009, 10:07 PM
Originally posted by hondarider661
cam


Hondarider661, can you make a cam suggestion, brand ect.
Chet
03-08-2009, 10:12 PM
I have read about the Sparks key, for the riders who has them installed, I have a feeling it will take away some top end is this so, I don't want give up any top end, we have this long railroad bed 3/4 mile where we really wind them out and there times when I am crakin it hard in 4-5 gears
but if the sparks key will help, i will go for it
03-08-2009, 10:13 PM
im not a 400ex guy. but in my 450r i have a hotcam. there good cams. i got mine used. for cheep.here
dunatic
03-08-2009, 10:26 PM
hot cam stage 1
rev box
timing key
400ex07
03-08-2009, 10:37 PM
I did the timing advance key, and I don't remember losing any top end power. If it lost any I did not notice it at all. I think its the best mod you can do for the price of it. But a cam would add power too.
honda400ex2003
03-08-2009, 10:46 PM
Agreed on the key and get an xr 400 cam or something. even a stage one hotcam would give you some improvement. I like mine in my 416. It hits pretty hard down low without losing any top. steve
03-09-2009, 03:47 AM
protect it with skids, then suspension...get the handling and power to ground transfer in line...the stock suspension wastes stock power so a ny added power is also a waste...
03-09-2009, 10:48 AM
Originally posted by Chet
I have read about the Sparks key, for the riders who has them installed, I have a feeling it will take away some top end is this so, I don't want give up any top end, we have this long railroad bed 3/4 mile where we really wind them out and there times when I am crakin it hard in 4-5 gears
but if the sparks key will help, i will go for it

deffinately not, reading up it seems you want more advanced timing in higher rpm because of the piston speed. I have my timing advanced 6 degrees and it will pull to the rev limiter without a problem in 5th gear. Deffinatly a great mod.