1986 Honda TRX350 running problems. NEED HELP - Honda ATV Forum
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post #1 of 15 (permalink) Old 05-21-2017, 07:16 PM Thread Starter
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Unhappy 1986 Honda TRX350 running problems. NEED HELP

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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post #2 of 15 (permalink) Old 05-21-2017, 07:33 PM
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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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post #3 of 15 (permalink) Old 05-21-2017, 09:28 PM
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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 ?.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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post #4 of 15 (permalink) Old 05-24-2017, 06:19 AM Thread Starter
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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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post #5 of 15 (permalink) Old 05-24-2017, 06:43 AM
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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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post #6 of 15 (permalink) Old 05-24-2017, 06:19 PM Thread Starter
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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

Last edited by shadetree; 05-25-2017 at 06:10 AM.
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post #7 of 15 (permalink) Old 05-24-2017, 06:21 PM
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Originally Posted by dillondeclue View Post
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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post #8 of 15 (permalink) Old 05-24-2017, 06:39 PM Thread Starter
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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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post #9 of 15 (permalink) Old 05-24-2017, 06:42 PM
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http://www.ghdiscountatvsupply.com/1...-u-s-shipping/

Best money you'll ever spend on an old bike..


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post #10 of 15 (permalink) Old 05-24-2017, 06:49 PM
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1986-1989 Honda Atv TRX350D Fourtrax Foreman Fuel Gas Tank *FREE U.S. SHIPPING* - G&H Discount ATV Supply

Best money you'll ever spend on an old bike..


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yep ^^^^, that's what, and who I got mine from !. best money ever spent on my old girl.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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