2003 400ex wont start
#1
2003 400ex wont start
hey guys, ive tried searching but i cant find the answer. firstly ive got a 2003 honda 400ex. i bought it used from the dealership so im not sure of whats been done to it aside from a pipe, filter and i drilled out the airbox. ive found that if the bike sits for a bit its hard to start and it wont idle at all for a few minutes on its own no matter where the choke is set to. but heres the issue i have now, yesterday i started the bike and it was sounding poppier than normal, it ran for a minute and then died and wouldnt start again. its got a full tank of premium and i checked the its getting fuel. i just ordered a sparkplug tool so i can change the plug but the ignition wire is giving off a strong spark. im hopeing its just the spark plug but if not then what else could it be? ive read about the kill switch being a culprit and i cant find any documents that talk about bypassing it. its definatly something id like to get rid of. also if you guys could point me to a FAQ section on here or perhaps a post thats gots some tips and tricks for this thing id appreciate it. thanks for your time
#2
#3
2003 400ex wont start
thanks for the reply, i wont know until i get the tool to check the plug to see what its runnign like. i havent ridden the atv since drilling the holes, only run it a few times but it hasnt left my garage. do you happen to have a diagram or perhaps a link telling me how to fatten up the air fuel mixture a little to compensate? also assuming i can do so without re jetting, how can i tell when ive added enough fuel?
#4
#6
#7
2003 400ex wont start
well after a headache ive got it sorted out, kinda. the 18 mm plug wrench had to be ordered, so it came in on saturday, was a little too long and kept hitting the bottom of the tank, so a hacksaw fixed that problem. i yanked the plug out and it was completely black. turns out the local place and the parts store dont have the proper plug for my 400 so i had to order 1. went home cleaned up the plug as best as i could and she fired up. runs like crap but it runs, so im jsut waiting for my new plug, supposed to be here today
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#8
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well the other day i went to ride my 400ex and i had been riding it just about all day, electric start isn't workin right now so i pushed it off and it cranked, i turned it around and then it died and wouldnt start back. i put new gas in, cleaned the carb, cleaned the jets, it was getting spark, put a different spark plug in, and still wouldnt start. can anyone give me some help b/c now i'm lost
#9
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hi josh I just worked on a 2000 400ex it had fuel ,compression,spark but would not start,I found that the timing chain had worn,and had jumped a number of teeth I put a new timing chain in ( $100) set the valve lash now it runs great.I heard this is a common problem,hope this might help
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