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View Full Version : 3/4 to full throttle


rooster300ex
03-07-2010, 08:39 AM
Do I need a larger main jet, because if I have my 300ex at around 3/4 open and then I goto WO I can't really feel any difference. The engine doesn't change sound or anything.

Here are a few pics after yesterdays ride at lake murray. I buried my front end twice. It was fun though.

http://img72.imageshack.us/i/dsci0091.jpg/
http://img708.imageshack.us/i/dsci0090s.jpg/
http://img521.imageshack.us/i/dsci0089s.jpg/
http://img256.imageshack.us/i/dsci0088k.jpg/
http://img693.imageshack.us/i/dsci0092d.jpg/
honda400ex2003
03-07-2010, 02:42 PM
i would suggest doing some WOT plug chops and see how one looks to determine how it is running at that position. you could also do some needle runs also to see how it is running there too. good luck, also what jetting are you running on the 300 now? steve
rooster300ex
03-07-2010, 09:27 PM
It runs good and everything I just noticed this yesterday. Anyways it was a dyno jet jet kit. 38 pilot, 3 turns out on screw, 4th groove from top on DJ needle, and the DJ 128 main. Mods are in my sig
honda400ex2003
03-07-2010, 09:45 PM
sounds like you are really close dude, how does the plug look after a bit of riding? steve
rooster300ex
03-08-2010, 11:12 AM
Its a dark brownish color. Plug looks good.
honda400ex2003
03-08-2010, 11:20 AM
sounds like you are good to go, you could try it just to see how it changes it. I wouldnt but if you are bored one day you could see how it does. steve
rooster300ex
03-08-2010, 12:06 PM
your mailbox is full
440exhondaman99
03-08-2010, 12:44 PM
Originally posted by rooster300ex
Its a dark brownish color. Plug looks good.

you could aways try bumping up the main jet one more size just to see if it helps.. if it dont then go back to what you had it it.. it cant hurt anything... im runing a lil ritch on my bike but if i ran the mixure perfect i didnt have like any top end at all so i bumped it up from a 170 to a 185 and it helped my top end a lil but it is runing a lil ritch
honda400ex2003
03-08-2010, 01:48 PM
Originally posted by rooster300ex
your mailbox is full

all cleaned out now sorry about that, i only had 2 messages in my inbox, i didnt realize i had that many sent ones. steve
honda400ex2003
03-09-2010, 03:59 PM
did you try anything new with the 300 roost? steve
rooster300ex
03-09-2010, 06:46 PM
nope not yet. I just washed it today. I'll mess with sometime when I get bord
honda400ex2003
03-09-2010, 07:36 PM
sounds cool. steve