Thread: 2007 400EX Smoking no more than 35 hours

The plug is a little dark, but not oil fouled by any means. It smokes less when warm but it does leave a trail of smoke anytime. I have a 1990 Yamaha that has been used and abused since new and it still doesn't smoke and starts much easier than this honda does. QUESS I GO BACK TO YAMAHA if I can unload this junk.

quote: Originally posted by rcracer We tried to take it to Hectors Honda in Jamestown, they said seeing you didnt buy it here we will get to it when we can, it could be a couple of months.........so we didn't have any luck there also. wow that is horrible. Obviously you are there because you are not happy with another dealer and they could gain another frequent customer if they took care of you. They must not like to make money

I would take a bunch of very detailed pictures of your 400ex, showing it's good condition. Take pictures of the plug, compression tester, various parts of the engine, etc. Contact Honda again, and send them this information- explain to them in the most professional way possible that what your dealer claimed was wrong and detail how you maintain your 'wheeler. I would also throw in the part about your 1990 Yamaha. In my opinion, a...

If the air filter wasn't maintained properly that could cause the rings to go bad by letting dirty air get into the combustion chamber

I thought if you take out baffle without jetting your leaning it out? and the airfilter being packed with mud will kill a motor if ridden long in that condition.

A few calls and some well written letters as well as emails to everyone that works at the location you bought it as well as honda corporate might get the ball rolling in your favor. Just dont cuss or swear in your letters or calls. Be patient and very persistant. Who is going to win?

is there any kind of residue on the plug itself, generally if you're bruning enough oil to present a constant stream of smoke it will be pretty apparent on the plug itself. also does it smoke no matter the temp of the bike? as in once it warms up does the smoke decrease or increase? maybe a short vid of the smoke? water in your gas?