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WB450

My 07 YZ450 is acting weird....

15 posts in this topic

I haven't rode it for a while ( 2 + months), but I've been starting it in the garage once a week, so a couple of weeks back it won't start at all. I pulled the plug and checked for spark, it was good so I put it all back together and it fired right up. A week later the exact same thing. I take it out Saturday and it was a little hard to start, but if fired up and all seemed good. I rode for a bout 8 minuted to warm it up and check the oil all of a sudden it died. It was like it lost the electrical. I do the spark plug thing, and it fired up on the first kick, I put it together and rode it for the rest of the day with no problems. Any ideas on what could be going on?

I would appreciate any thoughts about what may going on.

Thanks.

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I haven't rode it for a while ( 2 + months), but I've been starting it in the garage once a week, so a couple of weeks back it won't start at all. I pulled the plug and checked for spark, it was good so I put it all back together and it fired right up. A week later the exact same thing. I take it out Saturday and it was a little hard to start, but if fired up and all seemed good. I rode for a bout 8 minuted to warm it up and check the oil all of a sudden it died. It was like it lost the electrical. I do the spark plug thing, and it fired up on the first kick, I put it together and rode it for the rest of the day with no problems. Any ideas on what could be going on?

I would appreciate any thoughts about what may going on.

Thanks.

Have you changed the plug or just pulled it and looked at it?

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I changed it, I know I'm going to get the Valves!, but It started first or second kick before it deiced to turn 100+ here.

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I haven't rode it for a while ( 2 + months), but I've been starting it in the garage once a week, so a couple of weeks back it won't start at all. I pulled the plug and checked for spark, it was good so I put it all back together and it fired right up. A week later the exact same thing. I take it out Saturday and it was a little hard to start, but if fired up and all seemed good. I rode for a bout 8 minuted to warm it up and check the oil all of a sudden it died. It was like it lost the electrical. I do the spark plug thing, and it fired up on the first kick, I put it together and rode it for the rest of the day with no problems. Any ideas on what could be going on?

I would appreciate any thoughts about what may going on.

Thanks.

Almost sounds like you have some water in the fuel. Try a few capfulls of drygas to rule out moisture in the fuel.

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WB did you drain the carb or let the gas sit in it?

New gas or old gas in tank ?

It's new gas with sta-bil in it. I didn't drain the tank or the carb, but I added some sta-bil to it when I knew it was going to sit.

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That zipty carb may not like sta-bil. ...

try some new fresh gas first - see if it goes back to normal.

I was wondering about the sta-bil also, after I pulled the plug and kicked it over a few times and put it back together it ran fine the rest of the day. At what point do you add some fuel stabilizer to your fuel?

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If used in too high a concentration, I'd assume that it would modify the combustion characteristics of the fuel.

My deal is that the bikes never get stored long enough for it to be a problem. Mine sat for two months once while I was recuperating with no problems whatsoever. There's just too little fuel in the system to concern myself over protecting its quality.

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If used in too high a concentration, I'd assume that it would modify the combustion characteristics of the fuel.

My deal is that the bikes never get stored long enough for it to be a problem. Mine sat for two months once while I was recuperating with no problems whatsoever. There's just too little fuel in the system to concern myself over protecting its quality.

Thanks, I'm thinking that's my problem.

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Well guys thanks for all of the ideas, but this is what I found tonight when I dove in to it. I was going to drain the gas and dump in fresh, so put the gas line in a can and turned the petcock and nothing, I turned the gas cap and I hear glug, glug. I pulled the cap and pulled out the insert and tried to blow through the vent hole, guess what, there was no hole. I drilled out and put the cap back on and the gas flowed like a river. Easy fix, but for $200.00 there should have a vent hole IMO.:ride::bonk::eek::thumbsup:

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Did we forget to mention that we just installed an aftermarket tank? Yes, I believe we did. :ride:

Oh, well, maybe it wasn't important. :thumbsup:

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Did we forget to mention that we just installed an aftermarket tank? Yes, I believe we did. :eek:

Oh, well, maybe it wasn't important. :thumbsup:

:eek: :eek: :ride::bonk:

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