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Everything Dirt Bike
Make / Model Specific
Yamaha
1999 YZ400F NO START??
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<blockquote data-quote="BrettC95" data-source="post: 218359" data-attributes="member: 4767"><p>I got this bike on a trade a little while ago, and it was running. A little rough, but running. When I brought it home, I put some fresh gas in it, since it sat for a little while, and I rode it around the back yard to get a feel for it. It lasted all of 3 minutes before stalling and never started again. I'm fairly confident this isn't user error (as far as starting procedure goes) considering I started the bike 2 times before taking it home and then again, twice, when I got it home. The carburetor was rebuilt by one of our local shops in August, but sat since then. Naturally, I assumed it to be a carburetor problem so I pushed it into the shop and began tearing the carburetor apart. Everything was spotless, as if it had just came out of the shop the day before. I took care probably everything back together and then went on a hunt for the spark plug (what a pain that is). Spark plug fouled out. So I went and bought a new one. Put it in. Adjusted the fuel screw down from 2.5 turns out to 1.5, started it, it ran for about 15 seconds and died while I was playing with the idle. I tried to start it again. Nothing. 30 minutes of kicking, yelling, and breaking my foot, and nothing. So I pulled the new spark plug out and whaddayaknow?? It's fouled. Black. Still running rich? At only 1.5 turns out? Surely it shouldn't go in any further? </p><p></p><p>Anyways, I put another new plug in, and now.... I'm getting nothing. Still has good compression, still has spark, still getting fuel (as far as I know), but it doesn't even seem like it's trying to start anymore. Is it flooded?</p><p></p><p>For the record, I can turn a few wrenches but I am in no way a mechanic nor do I claim to be. But I would like to learn. </p><p></p><p>P.S. I know this type of thing has been covered many times before, but I'm at a loss right now and having trouble piecing together information from numerous threads and forums.</p></blockquote><p></p>
[QUOTE="BrettC95, post: 218359, member: 4767"] I got this bike on a trade a little while ago, and it was running. A little rough, but running. When I brought it home, I put some fresh gas in it, since it sat for a little while, and I rode it around the back yard to get a feel for it. It lasted all of 3 minutes before stalling and never started again. I'm fairly confident this isn't user error (as far as starting procedure goes) considering I started the bike 2 times before taking it home and then again, twice, when I got it home. The carburetor was rebuilt by one of our local shops in August, but sat since then. Naturally, I assumed it to be a carburetor problem so I pushed it into the shop and began tearing the carburetor apart. Everything was spotless, as if it had just came out of the shop the day before. I took care probably everything back together and then went on a hunt for the spark plug (what a pain that is). Spark plug fouled out. So I went and bought a new one. Put it in. Adjusted the fuel screw down from 2.5 turns out to 1.5, started it, it ran for about 15 seconds and died while I was playing with the idle. I tried to start it again. Nothing. 30 minutes of kicking, yelling, and breaking my foot, and nothing. So I pulled the new spark plug out and whaddayaknow?? It's fouled. Black. Still running rich? At only 1.5 turns out? Surely it shouldn't go in any further? Anyways, I put another new plug in, and now.... I'm getting nothing. Still has good compression, still has spark, still getting fuel (as far as I know), but it doesn't even seem like it's trying to start anymore. Is it flooded? For the record, I can turn a few wrenches but I am in no way a mechanic nor do I claim to be. But I would like to learn. P.S. I know this type of thing has been covered many times before, but I'm at a loss right now and having trouble piecing together information from numerous threads and forums. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
1999 YZ400F NO START??
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