1986 Honda trx350 running rich - Honda ATV Forum
Honda TRX Discussions for the Honda TRX, 90, 250, 300, 400, 450, 700

 4Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 20 (permalink) Old 05-16-2019, 10:40 AM Thread Starter
Member
 
86Hondatrx350's Avatar
 
Join Date: Apr 2019
Posts: 55
Liked: 9 times
1986 Honda trx350 running rich

Hello,

I have a 1986 Honda trx350 that is running rich (oem carb). It pumps out black smoke till warmed up then if reved when warmed up it pumps black smoke out. It idles normally for a bit then shuts off after a bit and noticed that it pops when reving down. I’ve messed with the screw hanging below the carb but it hasn’t made a bit difference.

I have no experience rebuilding or tuning carbs only cleaning them. The previous owner told me that he had drilled out the carb at one time and I think put a bigger jet in but not really sure.

Is there are any good aftermarket carbs that I could buy? Or should I find a way to fix it?

Thanks!
86Hondatrx350 is offline  
Sponsored Links
Advertisement
 
post #2 of 20 (permalink) Old 05-16-2019, 01:10 PM
Super Moderator
Supporting Member
 
shadetree's Avatar
 
Join Date: Feb 2010
Location: north little rock, ar.
Posts: 36,040
Liked: 4248 times
Garage
do not use or even think about after market carbs for that atv !. if your old oem carb has been drilled out ?, your best bet is look for a oem used carb, and rebuild it with a shindy carb kit. AGAIN...DO NOT USE ANY AFTER MARKET CARBS ON THAT ATV !!!.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
shadetree is online now  
post #3 of 20 (permalink) Old 05-16-2019, 01:24 PM
Gold Supporting Member
Supporting Member
 
Goober's Avatar
 
Join Date: Jan 2014
Posts: 3,008
Liked: 1333 times
Maybe he didn’t do anything to it but drill the replaceable jet.

You definitely want a Keihin QA03A that’s the oem for it. They are available on fleabay just not cheap–i bought one for $80 and after putting a $40 starter valve, $25 baffle and $25 rebuild kit in it i installed on my project 86.

The main jet is a 142, but i put 138.5 in mine and the high altitude jet is a 132? I run borderline high altitude so i think it helps.
so you should take your carb apart and see whazzup. Get a rebuild kit and a starter valve we’ll help you thru it—the Shindy kit comes with all new jets.

If the PO drilled anything on the carb itself , you can still keep it for parts.
misterclean59 likes this.

_________________
Click link for Honda service manuals! 👀 see, right here👇🏻 Click it 👇🏻
https://drive.google.com/drive/mobil...13&direction=a

https://www.rockymountainatvmc.com/oem-parts

https://www.partzilla.com/catalog/honda
__________________
Goober is offline  
Sponsored Links
Advertisement
 
post #4 of 20 (permalink) Old 05-16-2019, 07:22 PM Thread Starter
Member
 
86Hondatrx350's Avatar
 
Join Date: Apr 2019
Posts: 55
Liked: 9 times
Quote:
Originally Posted by shadetree View Post
do not use or even think about after market carbs for that atv !. if your old oem carb has been drilled out ?, your best bet is look for a oem used carb, and rebuild it with a shindy carb kit. AGAIN...DO NOT USE ANY AFTER MARKET CARBS ON THAT ATV !!!.
Quote:
Originally Posted by Goober View Post
Maybe he didn’t do anything to it but drill the replaceable jet.

You definitely want a Keihin QA03A that’s the oem for it. They are available on fleabay just not cheap–i bought one for $80 and after putting a $40 starter valve, $25 baffle and $25 rebuild kit in it i installed on my project 86.

The main jet is a 142, but i put 138.5 in mine and the high altitude jet is a 132? I run borderline high altitude so i think it helps.
so you should take your carb apart and see whazzup. Get a rebuild kit and a starter valve we’ll help you thru it—the Shindy kit comes with all new jets.

If the PO drilled anything on the carb itself , you can still keep it for parts.
Thanks for the quick responses,

I looked back in my messages and I still have the PO added, asked him what he drilled out and he said it was the choke slide, said it seized and he had to free it up. So does that mean I’m good then?
86Hondatrx350 is offline  
post #5 of 20 (permalink) Old 05-16-2019, 08:14 PM
Gold Supporting Member
Supporting Member
 
Goober's Avatar
 
Join Date: Jan 2014
Posts: 3,008
Liked: 1333 times
You will have to pull the starter jet to see if itís too loose in the bore.

In a warm engine When you flip the choke ON what happens? Nothing? It dies?

_________________
Click link for Honda service manuals! 👀 see, right here👇🏻 Click it 👇🏻
https://drive.google.com/drive/mobil...13&direction=a

https://www.rockymountainatvmc.com/oem-parts

https://www.partzilla.com/catalog/honda
__________________
Goober is offline  
post #6 of 20 (permalink) Old 05-16-2019, 11:21 PM
Super Moderator
Supporting Member
 
shadetree's Avatar
 
Join Date: Feb 2010
Location: north little rock, ar.
Posts: 36,040
Liked: 4248 times
Garage
Quote:
Originally Posted by Goober View Post
You will have to pull the starter jet to see if itís too loose in the bore.

In a warm engine When you flip the choke ON what happens? Nothing? It dies?
I think he was talking about just drilling the choke enrichment valve, not the bore ?.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
shadetree is online now  
post #7 of 20 (permalink) Old 05-16-2019, 11:23 PM
Super Moderator
Supporting Member
 
shadetree's Avatar
 
Join Date: Feb 2010
Location: north little rock, ar.
Posts: 36,040
Liked: 4248 times
Garage
Quote:
Originally Posted by 86Hondatrx350 View Post
Quote:
Originally Posted by shadetree View Post
do not use or even think about after market carbs for that atv !. if your old oem carb has been drilled out ?, your best bet is look for a oem used carb, and rebuild it with a shindy carb kit. AGAIN...DO NOT USE ANY AFTER MARKET CARBS ON THAT ATV !!!.
Quote:
Originally Posted by Goober View Post
Maybe he didnít do anything to it but drill the replaceable jet.

You definitely want a Keihin QA03A thatís the oem for it. They are available on fleabay just not cheapĖi bought one for $80 and after putting a $40 starter valve, $25 baffle and $25 rebuild kit in it i installed on my project 86.

The main jet is a 142, but i put 138.5 in mine and the high altitude jet is a 132? I run borderline high altitude so i think it helps.
so you should take your carb apart and see whazzup. Get a rebuild kit and a starter valve weíll help you thru itóthe Shindy kit comes with all new jets.

If the PO drilled anything on the carb itself , you can still keep it for parts.
Thanks for the quick responses,

I looked back in my messages and I still have the PO added, asked him what he drilled out and he said it was the choke slide, said it seized and he had to free it up. So does that mean Iím good then?
if it was just the enrichment valve, and not the bore itself ?, then yes, you are good to use that carb with a rebuild kit, you will how ever need to purchase a new choke enrichment valve if you do not have a good valve ?.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
shadetree is online now  
post #8 of 20 (permalink) Old 05-17-2019, 05:58 AM Thread Starter
Member
 
86Hondatrx350's Avatar
 
Join Date: Apr 2019
Posts: 55
Liked: 9 times
Quote:
Originally Posted by Goober View Post
You will have to pull the starter jet to see if it’s too loose in the bore.

In a warm engine When you flip the choke ON what happens? Nothing? It dies?
Quote:
Originally Posted by shadetree View Post
Quote:
Originally Posted by 86Hondatrx350 View Post
Quote:
Originally Posted by shadetree View Post
do not use or even think about after market carbs for that atv !. if your old oem carb has been drilled out ?, your best bet is look for a oem used carb, and rebuild it with a shindy carb kit. AGAIN...DO NOT USE ANY AFTER MARKET CARBS ON THAT ATV !!!.
Quote:
Originally Posted by Goober View Post
Maybe he didn’t do anything to it but drill the replaceable jet.

You definitely want a Keihin QA03A that’s the oem for it. They are available on fleabay just not cheap–i bought one for $80 and after putting a $40 starter valve, $25 baffle and $25 rebuild kit in it i installed on my project 86.

The main jet is a 142, but i put 138.5 in mine and the high altitude jet is a 132? I run borderline high altitude so i think it helps.
so you should take your carb apart and see whazzup. Get a rebuild kit and a starter valve we’ll help you thru it—the Shindy kit comes with all new jets.

If the PO drilled anything on the carb itself , you can still keep it for parts.
Thanks for the quick responses,

I looked back in my messages and I still have the PO added, asked him what he drilled out and he said it was the choke slide, said it seized and he had to free it up. So does that mean I’m good then?
if it was just the enrichment valve, and not the bore itself ?, then yes, you are good to use that carb with a rebuild kit, you will how ever need to purchase a new choke enrichment valve if you do not have a good valve ?.
How could I check if I need a new enrichment valve, I know the choke works fine but the PO said it was hard to get the carb set right after he drilled the choke to free it up. He also said something about somebody at his work removing the jets but said nothing about drilling them.

I can’t find a shindy rebuild kit, if I can find one I’ll buy it then start screwing with the carb once I get the kit.
86Hondatrx350 is offline  
post #9 of 20 (permalink) Old 05-17-2019, 06:35 AM
Gold Supporting Member
Supporting Member
 
Goober's Avatar
 
Join Date: Jan 2014
Posts: 3,008
Liked: 1333 times
Here are some ideas, but yes you will have to disassemble the carb to ensure it is clean and see if it’s been molested.

It would be best if you had the Shindy rebuild kit because it contains new jets. the gasket kit shown contains the passage plug. You may need a new starter valve.

Last pic is of two junked carbs I bought and rebuilt for the practice. You should try it. I think I bought one for $25.

Before you start. Do you have the service manual? You have to set up the carb with the pilot screw like 1.75 turns from seated. Ensure you initially take all the slack out of the throttle cable. Reply back when you have read the service manual on this task.
Attached Thumbnails
Click image for larger version

Name:	50EB382E-7458-4E80-BBC6-B650E6075E78.png
Views:	12
Size:	510.6 KB
ID:	136556   Click image for larger version

Name:	1D2C1104-E168-4F3C-9D49-4640BF2CF28B.png
Views:	12
Size:	1.20 MB
ID:	136558   Click image for larger version

Name:	E55E2442-35DF-48F7-9846-28AB58B62569.png
Views:	12
Size:	1.07 MB
ID:	136560   Click image for larger version

Name:	AEB71F32-E733-4086-BA09-A984BDCF6F56.png
Views:	12
Size:	818.6 KB
ID:	136562   Click image for larger version

Name:	B9D8B301-1608-42D5-A7F5-CB737E547657.jpeg
Views:	11
Size:	680.3 KB
ID:	136564  

misterclean59 likes this.

_________________
Click link for Honda service manuals! 👀 see, right here👇🏻 Click it 👇🏻
https://drive.google.com/drive/mobil...13&direction=a

https://www.rockymountainatvmc.com/oem-parts

https://www.partzilla.com/catalog/honda
__________________
Goober is offline  
post #10 of 20 (permalink) Old 05-17-2019, 06:43 AM
Gold Supporting Member
Supporting Member
 
Goober's Avatar
 
Join Date: Jan 2014
Posts: 3,008
Liked: 1333 times
Buy this book!
Best seller; classic read lol
Attached Thumbnails
Click image for larger version

Name:	FCBEB72D-B517-4B04-B612-81D904BD599B.png
Views:	11
Size:	1.15 MB
ID:	136566  

_________________
Click link for Honda service manuals! 👀 see, right here👇🏻 Click it 👇🏻
https://drive.google.com/drive/mobil...13&direction=a

https://www.rockymountainatvmc.com/oem-parts

https://www.partzilla.com/catalog/honda
__________________
Goober is offline  
Reply

  Lower Navigation
Go Back   Honda ATV Forum > Honda Model Specific Discussions > Honda TRX

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda ATV Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in













Similar Threads
Thread Thread Starter Forum Replies Last Post
1988 Honda fourtrax same size frame at Honda 1986 trx 250 se1ch3r ATV General Discussion 1 08-15-2017 07:32 PM
1986 Honda TRX 125 gas tank Haybale Honda TRX 5 07-31-2017 06:38 AM
1986 Honda 350 fourtrax upper steering sloppy Okie Honda TRX 21 12-03-2016 04:45 AM
1986 Honda 350 4x4 no power wehekman3 Repair & Maintenance 3 01-13-2016 12:12 AM
Trying to get 1986 Honda 250 TRX running tweb74 Repair & Maintenance 3 11-30-2015 03:52 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome