dyno jet

[JKD03]

i recently purchased a stage two dynojet kit. how do i find out the size jets that are in it now??

[honda400ex2003]

If it is all stock it is a kehin 148. you should be around a 138 or so with a dyno jet unless you take off the lid and have an exhaust and such. then you will be more. make sure you use the adaptor for the jets in the kit and use the needle that is provided. you should be good with it on the 3rd clip setting from the top. Good luck, steve

[JKD03]

well the honda shop put it in already i got a full sparks exhaust and a k&n air filter with the lid on im scared to ride it with the lid off

[honda400ex2003]

lol, i had my t-4 slipon and a k&n with a 138, 3rd position, 38 pilot, and 3.5 turns out on the f/a. you can check in the box to see what jet they used. if the dealer put it in, i am sure they just went with the directions on the sheet. the sheet is always rich enough to cover just about everything so you should be good. you can probably get it a bit better than what the dj sheet says. I would say that they used a 146 or so for the full exhaust and filter to cover it. steve

[JKD03]

so how do i tell if i need to re jet it i havent had a chance to ride sense the jets were installed due to wisdom teeth removal lol

[honda400ex2003]

i guess the only way is to do a plug chop and find out or at least drive it for 15 minutes. warm it up on a plug, then change it to a new one. then take it for a ride or do a chop by running it where ever you want to check it. so if you want to check the main, go wide open for a while and kill it while wide open a few times. you can look up a better description cause that one is not very good. lol, steve

[honda400ex2003]

heres a decent one. steve

http://www.exriders.com/vbb/showthread.php?s=&threadid=316367&highlight=plug+chop