88 trx300 - Honda TRX Forum
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post #1 of 12 Old 12-19-2018, 03:38 PM Thread Starter
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88 trx300

My TRX 300 recently began backfiring and losing power when advancing the throttle. It will start right up at onset and idle fine, as soon as you start to advance throttle it backfires and loses all power. This just started out of nowhere. Any suggestions?
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post #2 of 12 Old 12-20-2018, 02:05 AM
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Sounds like a carb problem - leaning out as you try to start to accelerate - try choking it as you accelerate and see if it makes it worse or better
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post #3 of 12 Old 12-20-2018, 11:02 AM Thread Starter
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Choking it makes it worse.
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post #4 of 12 Old 12-20-2018, 01:16 PM
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My guess is the air filter is clogged or the main jet fell out of the carb
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post #5 of 12 Old 12-20-2018, 02:58 PM
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Quote:
Originally Posted by Here 2 help View Post
My guess is the air filter is clogged or the main jet fell out of the carb
That's an interesting guess on the jet falling out, it does happen.

I had that happen once on a winter ride with my wife on the Yamaha Phazer snowmobile I was riding. She, oddly enough... was riding our (currently problematic) TRX300. Got'em both back to the parking lot and finally got the sled loaded. The TRX300 cooled off too quick I guess in the -15F degree weather and the valve stem cracked / broke dropping the valve into the cylinder when I tried to restart it to load it. Very odd timing as it had been run all day up to that moment. But hey, at least we were right at the trailer and not 20 miles from it.

I had completely forgotten that day until the "main jet fell out" comment. Amusing to re-remember it in a TRX300 thread.

Back to the OP, at least the carbs on the TRX's are super easy to get to.


-DallanC
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post #6 of 12 Old 12-20-2018, 03:29 PM Thread Starter
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I will check into it this weekend. Thx for the info.
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post #7 of 12 Old 01-02-2019, 04:42 PM Thread Starter
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Finally got to check out the recommended items above and found no issues with air filter or with the jets in carb. Any other ideas?
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post #8 of 12 Old 01-02-2019, 05:59 PM
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Next guess is a spark issue - probably the stator getting weak - might try closing the spark gap to about .018 to .020" and see what that does
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post #9 of 12 Old 01-23-2019, 06:01 PM Thread Starter
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First of all let me say thanks for the helpful input received, I finally got time and weather to dig a little deeper into the investigation of my problem with my trx 300. I pulled off the gas tank to recheck air filter and discovered that the intake vent tube had been clogged by mice storing acorns (yes acorns) for the winter. They were packed in so tight motor could not breathe, or start. Cleaned out acorns and she started right and ran like brand new. Who would have guessed? I just wanted to let you know problem solved and thanks again.
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post #10 of 12 Old 01-23-2019, 08:50 PM
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Glad you found the root cause. It was plugged upstream of the air cleaner so no debris got into the engine? Lucky... now go get some rodent killer ... or get a cat, or two


-DallanC
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