honda fourtrax 300 carb problems - Honda ATV Forum
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post #1 of 26 (permalink) Old 02-22-2011, 11:50 AM Thread Starter
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honda fourtrax 300 carb problems

My 300 fourtrax is having to be choked to start and choked to stay running, and once I push the throttle it dies almost every time, and when it doesn't die it seems to be quite delayed in its response, like I let off of the gas and it is still obviously getting gas for a few seconds.

I just installed a carb rebuild kit, drained the gas, put an inline fuel filter on and a new air filter and I am getting the exact same results.

after searching through the forum I've come across two things that caught my attention. @ http://www.hondaatvforums.net/forums...uote=1&p=71158 shadetree talks about the premier being torn up on the carb can cause a vacuum leak.

[QUOTE
Originally Posted by MONSTER
i used a aresal carb cleanerim posative i got all the o-rings out before hand one thing i realized last night when i was working on it the rubber part on the priemer was all crumbled i think i need to rebuild that as well
yes..rebuild that..it will not only cause a fuel leak ( just done one of those )..but it will cause a vaccum leak..in other words..your carb won't draw fuel from your bowl right..lol.][/QUOTE]

I'm pretty sure (not at home right now) that the rubber part on mine does have a small hole in it, and I recall the premier not really having any sponginess to it when I pushed it. Can I somehow rig this to test it? like wrap it tight with electrical tape just to test before I buy the $90 replacement kit for the premier

Another thing that caught my eye was the 2 1/2 counter-clockwise turns from being tight on the idle jet, I need to adjust mine because I know mine is not adjusted this precisely, could this cause the atv to die when not choked?
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post #2 of 26 (permalink) Old 02-22-2011, 12:01 PM
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Quote:
Originally Posted by ccook123 View Post

[QUOTE
Originally Posted by MONSTER
i used a aresal carb cleanerim posative i got all the o-rings out before hand one thing i realized last night when i was working on it the rubber part on the priemer was all crumbled i think i need to rebuild that as well
yes..rebuild that..it will not only cause a fuel leak ( just done one of those )..but it will cause a vaccum leak..in other words..your carb won't draw fuel from your bowl right..lol.]
[/QUOTE]

I'm not sure what you could have possibly comprehended from that post. HAHAHAH!

Welcome to the forums! and it sounds like you are on the right track though. a vacuum leak could cause your problem especially since the throttle valve is vacuum controlled its not hooked directly to the cable.

1988 FourTrax 300
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post #3 of 26 (permalink) Old 02-22-2011, 02:05 PM
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Welcome to the forums. When you installed the carb kit, did you blow out all the passageways in the carb body and adjust the pilot screw? Sounds like you have some debris in the pilot circuit, to me.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #4 of 26 (permalink) Old 02-22-2011, 02:09 PM Thread Starter
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which one is the pilot screw?
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post #5 of 26 (permalink) Old 02-22-2011, 02:20 PM
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which one is the pilot screw?
The pilot screw is located between the carb bowl and the intake, up under the bottom of the carb. Turn the pilot screw clockwise until it's lightly seated and turn it back out 2 1/4 turns. This is your initial setting. Start the ATV and run it until it warms up to operating temp. Now, turn the pilot screw clockwise until the engine starts missing or trying to quit. Then, turn the pilot screw counterclockwise until the engine starts missing or trying to quit. Finally, center the pilot screw in between those two positions.

Click the image to open in full size.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #6 of 26 (permalink) Old 02-22-2011, 02:24 PM Thread Starter
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Thanks, I will do that tonight when I get home and post results.
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post #7 of 26 (permalink) Old 02-22-2011, 02:26 PM
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Thanks, I will do that tonight when I get home and post results.
You're welcome. If that doesn't help, your carb probably needs cleaning good. It's easy to miss something in a carb. Sometimes, you have to clean them a couple times to get them right.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #8 of 26 (permalink) Old 02-22-2011, 03:26 PM
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on the 300 fourtrax screw it in all the way,go 2 and 1/2 turns out,be sure to count the turns.it helped me greatly
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post #9 of 26 (permalink) Old 02-22-2011, 05:27 PM Thread Starter
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When you say all the way in, will it be obvious that it can't go any further? Want to make sure I don't over tighten it.
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post #10 of 26 (permalink) Old 02-22-2011, 05:45 PM
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When you say all the way in, will it be obvious that it can't go any further? Want to make sure I don't over tighten it.
do not over tighten the needle..or it will break off in the carb..then your..well..pilot needle screwed !..lol.

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