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4 Posts
Hey everyone, I'm new to this site. I just got a 400ex a little over a month ago. It's an 06, completely stock. It runs great but I've started to look into doing some basic mods. I'm looking to get more top end speed on it so I'm planning on changing the stock 39t rear sprocket to a 36. When I do that, I want to do some basic mods to recover some of that low end torque back after the sprocket change. I'm planning on doing a Lexx slip on exhaust and a uni air filter. I plan on keeping the lid on (for now) because I ride in a lot of dirt, dust, and whatever else.
My question is, how do I rejet the carb to accommodate these new mods? I'm totally new to this whole process, first time I've looked into aftermarket stuff on any machine I've had and really know nothing. I know that stock pilot is 38 and main is 148 I believe. However, those are just numbers to me and I dont really know what they mean.
I've seen dynojet kits for 50ish dollars that I wouldn't mind spending the money on because it comes with instructions and again, I have no idea what I'm getting myself into. I also heard that a lot of people switch to the 42mm pilot because apparently the difference in cold startup and idle is night and day but apparently the dynojet kit doesnt come with pilots? I'd like to go to a 42 but i cant find a dynojet 42 pilot and i heard somewhere that you arent supposed to mix brands? Not sure if this is true or not. Also if I could get any guesses on what size main I should start out with, thatd be awesome.
I guess my main (no pun intended) question is can I use a 42 pilot from whatever brand with a dynojet kit? Sorry for the long post but I'm trying to give everyone a background to my situation. Any help would be awesome. ??
Also if anyone has an estimate of price if I would just take it somewhere to get it jetted by someone who knows that they're doing, thatd be great too.
My question is, how do I rejet the carb to accommodate these new mods? I'm totally new to this whole process, first time I've looked into aftermarket stuff on any machine I've had and really know nothing. I know that stock pilot is 38 and main is 148 I believe. However, those are just numbers to me and I dont really know what they mean.
I've seen dynojet kits for 50ish dollars that I wouldn't mind spending the money on because it comes with instructions and again, I have no idea what I'm getting myself into. I also heard that a lot of people switch to the 42mm pilot because apparently the difference in cold startup and idle is night and day but apparently the dynojet kit doesnt come with pilots? I'd like to go to a 42 but i cant find a dynojet 42 pilot and i heard somewhere that you arent supposed to mix brands? Not sure if this is true or not. Also if I could get any guesses on what size main I should start out with, thatd be awesome.
I guess my main (no pun intended) question is can I use a 42 pilot from whatever brand with a dynojet kit? Sorry for the long post but I'm trying to give everyone a background to my situation. Any help would be awesome. ??
Also if anyone has an estimate of price if I would just take it somewhere to get it jetted by someone who knows that they're doing, thatd be great too.
