Need Help: CR250R Smoke & Smell - Off-Road Forums & Discussion Groups
Dirtbike Lounge Hang out and talk two wheels. For Tech and Racing specifically, see those forums below.

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 08-08-2007, 02:28 PM Thread Starter
 
Join Date: May 2002
Posts: 2,424
Thanks: 0
Thanked 0 Times in 0 Posts
 
Thumbs down Need Help: CR250R Smoke & Smell

I was running 44:1 ratio in my 99' cr250 with 93 oct, however I found it a little too smokey. I decided to try 50 to 1. Which worked awesome. I adjusted the clutch then the bike started to smoke when it wasn't running. Now I'm getting some oil out the top of the cylinder . This smoke is white, it smells terrible, not like regular burned oil, but I don't think the clutch is slipping. Any input?


Running snythetic Bel ray 2-stroke oil . 50:1
stock compression, new clutch and top end.


Thanks ahead of time. Ian
300EXrider is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 08-09-2007, 12:31 PM
 
Join Date: Aug 2007
Posts: 49
Thanks: 0
Thanked 0 Times in 0 Posts
 
Angry 50 to 1 ??????

Sound like, (smells like? ), antifreeze burning ... methinks you may have an internal leak somewhere? ... exaserbated by your choosing to run your motor hotter!

Your recommended fuel / oil mixture is 32 to 1 of which most racers push it to 40 to 1 ... however 50 to 1 is in my opinion way to little oil!
In a nutshell ... More oil is better because it:

Improves ring seating and sealing
Reduces overall sliding friction on piston skirt, ring(s), and bearings
Lubricates the bottom end crank bearings more effectively.

Also, contrary to popular belief, additional oil does not adversely affect carburettor jetting, unless at extreme ends of the spectrum, ie. going from say 100:1 to 15:1

That said ... methinks you should find out what has been damaged by the lack of lubrication and deal with the fact that you ride a two smoke ... It leaks oil on your garage floor , it smokes AND IT DEVELOPS MORE POWER THAN A FOUR STROKE!

Last edited by Anthony; 08-10-2007 at 02:23 AM. Reason: Adnl. info added.
Anthony is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups 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 not post new threads
You may not 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