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Old 03-20-2011, 08:10 AM   #1 (permalink)
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2003 trx250ex wont run

It has spark and is getting fuel but will not start. It wil pop a couple of times and thats all. It got stuck in the snow and hasnt run since . I have drained gas and put new in. put new plug in.changed air filter. any ideas

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Old 03-20-2011, 08:18 AM   #2 (permalink)
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How does the air filter/air box look? Did any mice make the airbox a home?
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Old 03-21-2011, 07:21 PM   #3 (permalink)
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I changed filter still wont run
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Old 03-21-2011, 07:51 PM   #4 (permalink)
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man you mention mice, i had a thread about rats eating a tube and it wouldnt run, it was cold out kinda like what your saying here.
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Old 03-21-2011, 09:03 PM   #5 (permalink)
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I have a 2006, and mine did the same thing. Ended up needing a carb clean. Once I got it cleaned, I ended up frying the cdi. What happens if you pour a small capful of fuel down the spark plug hole and then try and start it? Will it run for a few seconds?

The only thing that throws me off is that you say that it got stuck in the snow and hasn't run since. ????? Carb isn't going to dirty itself in the snow, but if you let it sit for 2-3 months or longer after that, you will need to clean it anyway.

How are you sure it's getting spark?
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2001 Suzuki LT A50
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2006 Polaris Sportsman 90 - 2 inch lift
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Old 03-21-2011, 10:50 PM   #6 (permalink)
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first..spray a short burst of starting fluid in the carb...does it fire up and run ?..if so..then you got carb issues...if it don't fire up and run for a few sec's..then you got compression issues..either from jumped timming..or bad rings.
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Old 03-22-2011, 12:42 PM   #7 (permalink)
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pros and cons to starting fluid. I have used it, but just don't get happy with that$ 1.50 can! Spray a short burst like shadetree says. If it fires up for a short time, DO NOT repeat the process. You have already found the problem. Continuing to run it with repeated bursts is NOT recommended.

You can spray some on the filter if you like. I used to use starting fluid, but no longer want the risk. Others use it religiously. Your choice.
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1996 TRX300FW - ITP Mudlites Warn XT25 (Current Project)
2001 Suzuki LT A50
2003 TRX300EX
2006 Polaris Sportsman 90 - 2 inch lift
2006 TRX250EX - Maxxis Razrs
2007 Suzuki King Quad 700 4x4 - ITP Mudlite XL
2008 TRX450ER - No Lid, HRC Kit, 162 Main, 48 pilot, 55 leak jet

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Old 03-22-2011, 02:09 PM   #8 (permalink)
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If you don't feel comfortable using starting fluid, just pour some gasoline in a spray bottle and use it.
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Old 03-23-2011, 05:02 PM   #9 (permalink)
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I tried starting fluid and still nothing.Pulled plug and put it by metal and could see it spark.It has a aftermarket pipe . Checked it and it has no gasket on the head. Burnt valves? Thanks For all the help.
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Old 03-24-2011, 06:08 PM   #10 (permalink)
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check the valve clearances. Sounds like what my Recon was doing and I was told to check the valves and the intake valve was tight so it wouldnt start
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