Why is my 400ex smoking

I dont think it would smoke alot if it only popped a little, try the tip from the and see what happens. Clean the carbs if that doesnt help. Having your valves not adjusted perfectly would not make it smoke, as long as they are not ticking then I wouldnt worry about them, although it may be about time to adjust them.

If you can get it just right where there is no smoke then you will know if it is a fuel mixture problem. I'll try that choke thing tomorrow. Also There are two out of three screws stuck in the exhaust the ones that hold the tip on. I tried getting them out a little today, I will get an easy out on it tomorrow, and if that dont work I'll drill it out.

But then I'll try the exhaust tip. I think the bike came from georgia, could it have different jetting cause of that?

Would that make it leaner or richer? What does ticking valves mean? I didn't notice any ticking valves. I did notice a little cam chain noise, not alot though.

I got the bike cheap enough that even if I do have to do a complete rebuild, I will still be ok. I think I should have time to do some stuff to it tomorrow. What is most common? Supreme Member Offline Location: miami Posts: Ok, so should I go ahead and order piston and rings or just rings? What else should I replace while I am in there?

It is 5 years old, so it is probably on its original top end. Will I be able to replace with std bore piston? As far as boring out the , I would not on that age unless you want to start blowing headgaskets,,,,the 's have an interesting problem around that age that the metal gets weak from the increased heat and pressure and will actually allow the head to stretch a little so much that you blow a headgasket. Ya, I would not want to bore it unless I have to, because of cost, and in many cases it decreases the value of the bike, cause people assume that it was raced or abused.

I'll do the compression test and let you all know the results. If it is a , do you think I need a piston and rings or just rings?

What determines if you need a piston as well? If I didn't replace the piston, what could happen to it if I just used the original one with new rings? I drilled out those exhaust bolts and tried the tip from the the ex, and it still smoked as suspected , but I dont think it smoked as much, and it was extremely quiet.

I'll try and get the compression tester from my friend, and test it this evening. I will let you know the results. It certainly does sound like rings but he said its white smoke. I said it could be running lean but for some reason I was thinking about a diesel engine, diesels blow white smoke if theyre running lean. The only reason for it to be blowing white smoke is burning water - anitfreeze.

But this is air-cooled. So your either blowing black smoke and running really rich to see a large amount of it. Or its oil which would be your rings. Rings are most likely your problem. You may not need a new piston, you may be able to replace the rings on the stock bore. From neutral with the quad running reach down and move that lever forward and then shift down twice, it should go past first and into reverse.

Sweet, apparently it does in fact have reverse…. The Banshee is considered an off road ATV and not one designed for closed courses only, so they were affected by this regulation. Skip to content Popular. April 23, Joe Ford. Table of Contents. I just noticed that it leaks oil at the header and motor connect.

I just got it from a guy that said he rebuilt the top half and he told me that the valves needed to be adjusted. But what will make it leak? Thanks in advance. What will make it leak? Well unfortunately, possibly a poorly done rebuilt upper half! Oil is getting into the combustion chambers which causes the smoke. Could be the head gasket was not installed properly, or the head deck had some debris between the gasket and the head or block.

Also could be the piston rings were not aligned properly allowing oil to get by. Also check for the presence of, and the proper installation of the valve seals. Oil can get by those too and drain into the combustion chambers.

Probably not what you wanted to hear, but smoke is caused from oil in the combustion chamber. These are three ways it could get there. Also, this is probably a dumb question, but I assume you are not putting oil in the gas like you would for a 2 stroke engine. You can post now and register later. If you have an account, sign in now to post with your account. Note: Your post will require moderator approval before it will be visible.

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Reply to this topic Only 75 emoji are allowed. Insert image from URL. Go to topic listing. Similar Tagged Content. Hey y'all. I have a Yamaha ymf BearTracker. I got this thing for free from people whose son tore it to hell. So it wasn't in great shape to begin with. So when it ran it ran rough and I got it running for a year or two, just something fun for the kids to ride on with me on gravels.

Now just randomly, the start button stopped working so I had to jump the solenoid, then put a temp start switch in. Kill switch would still work.