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I have a 1986 Honda TRX 350 that is having issues. backround info on repairs are to follow. in the last six months or so all of these parts have been replaced. oil change and filter, gear oil in both diffs, OEM fuel pump and fuel filter, air filter, battery, and the carb has been rebuilt and cleaned. the other day while riding i would start in first and work my way through the gears and at any point in time it would start acting up. it had nothing to do with a specific gear i believe, but i would have a constant hold on the throttle keeping a constant speed. then it seemed like it would cut out or the rpms would drop and the go back up and could eventually die. it would drop rpms/cutoff multiple times. it did not always die on me but it would sometimes. the bike idles like normal and even havent had issues using reverse. this just happened the other day after i rode it some over the weekend before the problems occured. it rode fine actually at a guys house who looked at it for me and we just drained the carb and im cleaning the air filter and filter box. then I get back to my house and decided to try it again without the filter on and it acted up again and died down the street but i could get it started again fairly easily. Any ideas at all would help. he said that compression almost 100 percent isnt the issue due to the way it runs and idles. he said it wouldnt run how it runs with bad compression. thank you for any input you guys have
 

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Welcome to the forums!

I would check the fuel tank for rust first... those old steel tanks are known rust buckets... loose rust flakes can clog up the petcock and fuel filter pretty fast. Get a FSM HERE for your reference if you haven't gotten a copy yet.

Do you think it is acting like an ignition problem or a fuel starvation problem? The ignition is pretty easy to diagnose on those TRX350s if clues lead you there...

I have an 87 so I'm interested in what you find out. Keep us updated if ya can...
 

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sounds to me, its running out of fuel from the fuel tank ?, or the float needle is sticking closed, not letting the bowl fill up ?.
 

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Someone also had the idea that there is an air leak in a gasket. Maybe a carb gasket idk. It idles fine and you can rev it up but it will start sputtering when running it through the gears.
 

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Yep, I would also suggest cleaning the fuel tank and certainly checking/cleaning the petcock filter/screen. Be sure to fit an 'inline' fuel filter too, for me this is a must on every ATV.
If your tank is dirty and has sediment in it then unfortunately your going to have to strip your carb down and give it a thorough cleaning again.
 

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UPDATE
there is stuff in the gas tank so it will get cleaned and the carb will too. I'm not going to do it though because working on that is a pain in the butt. The guy who did it for me last time lives up the street and he charged me 40 bucks to rebuild the carb lol. Hopefully he gives me a good price again. Someone else I know quoted 200 so f that. Might sell the bike
 

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UPDATE
there is shit in the gas tank so it will get cleaned and the carb will too. I'm not going to do it though because working on that is a pain in the ass. The guy who did it for me last time lives up the street and he charged me 40 bucks to rebuild the carb lol. Hopefully he gives me a good price again. Someone else I know quoted 200 so f that. Might sell the bike
if your gonna keep it ?, spend the 300 bucks, put a plastic tank in it !. that's what I did to my '89 trx350D foreman 4x4.
 

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Discussion Starter #8
If I'm spending 300 I'm just gonna get it fixed. Granite would be easier to just install a new tank instead of cleaning it but damn 300 is crazy expensive. Then after I get the carb cleaned again and if that doesn't fix my problems I'm gonna be pissed
 

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I have the same quad, and it is doing the same thing kinda. Runs good at low RPMs but when I go faster it backfires sometimes, bogs down and usually dies. It starts up ok and idles fine, last year I cleaned out the gas tank and I cleaned the carb an hour ago. Still junk. What should I do?
 

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I have the same quad, and it is doing the same thing kinda. Runs good at low RPMs but when I go faster it backfires sometimes, bogs down and usually dies. It starts up ok and idles fine, last year I cleaned out the gas tank and I cleaned the carb an hour ago. Still junk. What should I do?


Start your own thread for better response..

Sounds like you still have a problem with your carb.. Me and several others have cleaned carbs multiple times and still had problems... rule of thumb, when you THINK it's clean.. clean it again.. lol

Welcome to the forums!


Sent from my iPhone using Tapatalk
 

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If it is backfiring then I think you have a lean condition caused by vacuum leak. Check your manifold boot to make sure it's bolted snug and especially check your carb to ensure it's seating in the boot and the ring is tight.
Wiggle the carb back and forth I think you might see it's loose or changed running condition
Also if your starter valve oring is torn will backfire also


Take your fuel tank out and clean with vinegar it will loosen the rust. I have a small cement mixer filled tank with vinegar and BBs wrapped in bubble wrap and cardboard to wedge it in the mixer. Let it run for three hours and all rust was gone. Rinse out tank with water mixed with high pH hot tub chemical and dry immediately with hair dryer or heat gun. Watch you don't get it too hot or you'll ruin the paint
 

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It's over thirty years old I wouldn't get mad or disappointed about it stuff happens stuff breaks. $300 is not a lot of money for fixing these rigs when the labor rate is $116/hr.
PM me or let us know when you want to sell
 
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