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Discussion Starter · #1 ·
I just bought a 99 TRX 300 that has been sitting 2-3 years that I'm trying to get running. I drained the tank, checked the screen (which was clean), put in a new sparkplug and battery. BTW, the old spark plug was oily. At first it just turned over without firing so I pushed the primer button on the carb and it would fire for a few seconds. Then from reading the Clymers service manual, I pulled the choke cable and sprayed some WD40 on the o-ring to make sure it wasn't stuck. After that, it ran longer at idle, but when you tried to give it gas, it would either die or backfire. Any input would be appreciated.

On a side note, I've gotten some good info off this site since I bought it a few weeks ago.
 

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You'll have to pull the carb off and take it apart and clean the jets and the passageways in the carb body and also the float needle and seat.
 

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Discussion Starter · #3 ·
That's what I figured since it's been sitting so long, I just wanted to verify that before I tore it apart.
 

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That's what I figured since it's been sitting so long, I just wanted to verify that before I tore it apart.
Yeah, anytime one sits for any length of time, the carb will have to be taken apart and cleaned.
 

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Discussion Starter · #5 ·
I got the carb all apart and cleaned. The only part that is giving me problems is the slow jet. Does this part have a hole that goes all the way through? I've soaked it in carb cleaner and used a small wire off a wire brush and still no luck. Any suggestions.
 

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Discussion Starter · #6 ·
I got it. Soaked it in xylene and tried different size wires. It's a really small hole, but a .015 wire pushed it through. I'm going to install the carb this weekend and see how it runs.
 

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I got it. Soaked it in xylene and tried different size wires. It's a really small hole, but a .015 wire pushed it through. I'm going to install the carb this weekend and see how it runs.
Yeah, those slow jets can be a little hard to unstop sometimes. Glad you got it, hope it runs good for you.
 

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Discussion Starter · #8 ·
As plugged up as the carb was, I can't believe it even ran. The main jet was completely plugged up good also. Everything else just needed a good cleaning. The Clymer manual has great step by step instructions with good pictures.
 

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Discussion Starter · #9 ·
I put the carb in and it runs great. Now I need to get the back brakes working. I haven't even looked at them yet.
 

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I put the carb in and it runs great. Now I need to get the back brakes working. I haven't even looked at them yet.
Glad you got the carb fixed. It's hard to keep the brakes working good on the Fourtrax 300. I never could keep mud and water out of them.
 

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Similar Carb Problem

I am new memeber and just got a 1995 300 Fourtrax with carb problems. Where can I get the Clymer manual you referred to? Was it a big deal to remove and clean the carb? I also will be needing to fix rear brakes and am interested how you made out working on yours.
 

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STA-BIL. year round!! and you wont have that problem again.
 

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Discussion Starter · #13 ·
I am new memeber and just got a 1995 300 Fourtrax with carb problems. Where can I get the Clymer manual you referred to? Was it a big deal to remove and clean the carb? I also will be needing to fix rear brakes and am interested how you made out working on yours.
I got a new Clymer manual on line and shipped for less than $25. Just do a search and see what the best deal is, my computer crashed about a month ago and I lost the information.

The carb is real easy to remove, 2 clamping bands for the boots, choke cable, throttle cable and drain line. There might be something else, but I'm going on my poor memory.

As far as taking apart, cleaning and reassembly, just read and make sure you understand it first then follow the instructions. I put all the sub assembly parts in labeled bags so I wouldn't lose anything and to help me remember everything. I also recommend working on a clean table, because once I flipped the carb over and a little o-ring fell out and I had to figure out where it came from. Cleaning the jets are the hardest part, but if it's really clogged up, you can always buy a new one. Just be carefull and use a small wire from a brush so you don't damage the bore.

I still haven't even looked at my rear brakes, because I'm too busy riding it all over the place!
 
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