newbee jetting info

[inlinepwr]

i'm looking into jetting it seems that is a very important mod. to do so i was hoping to get some help. i've read quite a few posts on this topic so i'm starting to understand it some. i took the bowl off the carb to find out what jets i have 38 & 148. the main jetting seems strait forward just get the next 5 sizes larger, but not sure which pilot to get . any info will help this newbee thanks

[honda400ex2003]

I would not even mess with a pilot unless you are out like 4 turns on the fuel/air screw. Otherwise a main a few sizes bigger and about 3 turns out on the f/a would be good for what you have with the exhaust and filter. If you want to convert it i used a dynojet 138 with my slip on t-4 and a k and n. If you go the carb and tuning thread there are many different setups and you can most likely find one just like yours. it is a good starting point then do a plug chop and check it out. steve

stay away from dynojunk kits!!!! go to www.jetsrus.com and read their faq's on the left

[Eviltanker]

I'm at 502ft above sea level and Run a 40- 152- needle on the 3rd- and 2 1/4 turns out.

[honda400ex2003]

i just used it for example purposes so he could cross reference them I would just buy some from your local shops if they have them otherwise get some from jetsrus steve.

[inlinepwr]

thanks for the replys. i'll be picking up some jetts tonight so i guess i'll see how it goes. whats the deal with the main jet it has a nutt on it and looks like it is adjustable?? also should i change both jetts at the same time or change one ride the bike than change the other to make sure its going in the right direction??

[Eviltanker]

Start off with your base then run a plug chop. Work up from there.

[honda400ex2003]

The one with a nut that looks adjustable could be a dj. they have a sleeve and then a seperate jet that screws into it. I am not sure otherwise. oh and evil tag, you are it now. LOL steve

[Eviltanker]

2- Needle set,jet
16- Nut,hex
24-Holder,Needle jet
39- Jet, main
25- Holder,jet

Back to you Steve

[honda400ex2003]

I never really looked into the whole inside fo teh carb. I thought he was just talking about the jet being different on the end i think? The only one i have seen that comes apart is the dj. back to you evil. i have to look at it some more and think about it. steve

[inlinepwr]

how do i check the clip position in the carb. i can't seem to find info what setting shoulb it be at. i rejetted to 40 pilot and 155 main but haven't riden it yet.

[Eviltanker]

when you look at the needle with the point down you will see 5 grooves with the clip in one of them. You are probably safest putting it in the middle slot.

[honda400ex2003]

yup, the 3rd from the top would be good to start also. that is a general spot. steve