jetting 2002 400ex wit K&n and lid removed questions

[OutlawEX]

Ok guys my friend is having trouble wit jetting his bike..I tried helping as much as i knew and its weird...Ok he has a 2002 400ex with the lid removed and a K&n filter...The waether is about in the 80's so i was wondering what jet u put in urs and what did u all mess with,the pilot,air screw,main..And remeber its basically stock no pipe,so dont reply if u jetted us wit a pipe on ,sorry...Ok thanks alot guys

[tprender]

Try a 42 pilot and a 152 or 155 main as a starting point if you have still have the stock exhaust. Clip in the middle.

[eldoexrider01]

if he is gonna run dyno-jets, i can go look at my instructions for his applicatons but besides that i would go with his above and jus tinker with it and find the sweeeet spot

[OutlawEX]

he isnt running dyno,his bike is all stock besides the kn and he is at a 48 pilot and a 188 main and its still burning white....I donno what its doing

[Dune Surfer]

A 188 main is way to big. I am running a 160 main at sea leval with a pipe,K&N, and outerwares airbox lid cover. I would start at a 155 with his bike.

[300eXTraILRyDeR]

this might be stupid but if your runnin a 188 maybe not. are you sure your checking the bottem of the sparkplug right?? if not take the bike to a shop.

[OutlawEX]

I know how to jett a bike,i been riding for 10 years...Here i thought i was strange i got a 225 main in mine but its ported..But his bike is all stock and he put a filter on it and bumped the jet up till it was getting richer and richer so he ended up at a 188 main and it still was white,So then heput the lid on and bam it ran brown as it should....Maybe the plug is messed up oir something,its the oddiest thing i seen...A ported 400ex runs noramlly about a 190-200 and he at a 188...Everything is being done right....Maybe when he gets a pipe on it ,it will jet better...

[TravEX]

alot of guys on here say that you can't go on plug color alone with the gas additives these days,,,with the 188 does it act rich?,,,i would say that a 155 would be suitable for his application,,,