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View Full Version : advise for 87 250x i need parts.. 400ex carb ?



all4jesus1122
12-06-2006, 01:23 PM
some have said 400ex will work for my 250x is there any adjustments i need to make. jets. filters?

if i can get a used kiehin 38mm would that be better?

i think i need to rebuild the whole engine. its runs very weak and a bit rough.

sounds like i shold get a cam while i am at it and maybe bore it out to 80 mm


anyone selling parts for a 250x.
i need:
rear brake calipar
400ex carb
ehaust
engine parts, rebuild


repair MANUEL

SET THE STAGE
12-06-2006, 03:57 PM
looks like a nice project. i don't know a whole lot about the swapping of 250x carbs (or any 4-stroke carb for that matter.)

all4jesus1122
12-06-2006, 05:28 PM
i already have :

+3+1 American Star racing arms
with 400EX Shock conversion,
extened swing arm with
+4 Durablue Axl
Renthal handle bars


i would highly recomend the 400ex conversion kit for any 250x or 300ex. it only costs about 2-300 dollars. It is a huge improvement. rides like a cadilac (aka 400ex) very stabile now

lets hear it guys what mods should i put into this motor while i rebuild it

zell250x
04-12-2007, 05:11 PM
i rebuilt mine last year and put a 12to1 comp piston, i recomend changing cam chain, and i put a new clucth and stiffer clutch spirngs in it. that made a big difference. but im putting a 350x motor in right now and hoping for a big improvment. i also have 400ex shocks on but i need 400ex a arm now.

2muchquad
04-12-2007, 10:06 PM
If you got the dough ,go with a 80mm piston kit or 76mm which you can use your sleeve,that will put you at 260cc or so.Drop in a cam and get a 400ex carb along with a exhaust system and you should be ready to rip;)

DJR300ex
04-13-2007, 03:51 PM
nice, i have a FMF Megamax full system ill sell you for real cheap, but i would recommend that you save up and get a sparks. BTW i like how you front fenders are cut. do you have any more pics of it?

all4jesus1122
04-14-2007, 02:07 PM
hey i dont know much about the fmf but a guy i know said he likes his where you from.... how much would you sell it for

DJR300ex
04-14-2007, 03:54 PM
im from Lebanon, Missouri. i'll try to clean it up tonight and take some pics if you want them. i need rid of the thing, it's just sitting in my garage so i'll sell it real cheap. just give me an offer