YFM250 Carb rebuild gone bad - Yamaha Forums
Welcome to the unofficial Yamaha Forums community! Please Register to gain full access and remove the Ads! it's FREE!    
 
LinkBack Thread Tools Display Modes
post #1 of 2 Old 01-02-2021, 05:19 PM Thread Starter
 
Join Date: Nov 2020
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Angry YFM250 Carb rebuild gone bad

My 2004 Yamaha Bear Tracker (yfm250) was not idling very well so I decide to rebuild the carburetor. took it apart, soaked it in carb solvent overnight and reassembled with a rebuild kit. Starts right up but runs like the throttle is wide open. It is not. The throttle mechanism is resting against the throttle adjustment screw or even its base if I back the screw out. I've taken it back apart and checked assembly against a diagram I found online. Everything seems in order, but it still roars when I start it. I am sure I've done something wrong, but not sure where else to look. Mixture adjustment screw is 2.5 turns out from bottom, but even if I turn it in or out while it is running it does not seem to affect it. Runs really good,just way, way to fast.

The kit did not include any new diaphragms.

Help!!
Joe Stevens is offline  
Sponsored Links
Advertisement
 
post #2 of 2 Old 01-02-2021, 10:27 PM
 
Join Date: Aug 2019
Posts: 317
Thanks: 0
Thanked 21 Times in 21 Posts
Quote:
Originally Posted by Joe Stevens View Post
My 2004 Yamaha Bear Tracker (yfm250) was not idling very well so I decide to rebuild the carburetor. took it apart, soaked it in carb solvent overnight and reassembled with a rebuild kit. Starts right up but runs like the throttle is wide open. It is not. The throttle mechanism is resting against the throttle adjustment screw or even its base if I back the screw out. I've taken it back apart and checked assembly against a diagram I found online. Everything seems in order, but it still roars when I start it. I am sure I've done something wrong, but not sure where else to look. Mixture adjustment screw is 2.5 turns out from bottom, but even if I turn it in or out while it is running it does not seem to affect it. Runs really good,just way, way to fast.

The kit did not include any new diaphragms.

Help!!
The idle has to be set too high, there is no way for it to over rev without air and fuel going through. Can you turn down the idle any more?
Warrior_Scott is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Yamaha Forums 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










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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