All Things Moto! Dirtbike Forums  

Go Back   All Things Moto! Dirtbike Forums > Dirt Bike Knowledge Base and Build Threads > 2-Stroke Dirt Bike Knowledge Base

Reply
 
LinkBack Thread Tools
  #1  
Old 01-10-2004, 10:53 AM
Welcome To ATM
 
Join Date: Jan 2004
Last Online: 01-23-2004 07:58 PM
Posts: 2
Default 2002 cr250 surging?

I just picked up a 2002 cr250 and rejetted it according to the manual for winter conditions. The main 400, needle 6bey31-73 in the 3rd clip position, and a 35 slow jet with the screw 1 1/2 out. The bike is mainly stock except for pro circuit pipe and silencer. After running wide open and rolling off the throttle I pull the clutch in and the bike surges. Any help would be greatly appreciated.
Reply With Quote
  #2  
Old 01-10-2004, 11:06 AM
Mecrazyperson's Avatar
Banned
 
Join Date: Nov 2003
Last Online: 05-12-2008 03:26 PM
Posts: 1,302
Default Re: 2002 cr250 surging?

Quote:
Originally posted by nmitcheff
I just picked up a 2002 cr250 and rejetted it according to the manual for winter conditions. The main 400, needle 6bey31-73 in the 3rd clip position, and a 35 slow jet with the screw 1 1/2 out. The bike is mainly stock except for pro circuit pipe and silencer. After running wide open and rolling off the throttle I pull the clutch in and the bike surges. Any help would be greatly appreciated.
FIRST OFF WELCOME TO ATM.

I also have an 02 CR250, everytime my bike surges its because you either need to adjust the throttle cable or because the throttle cable is rapd around the petcock. I seem to always do that.

Faded should awnser you question he also has an 02 and is better with jetting then I am. best of luck to you.
Reply With Quote
  #3  
Old 01-12-2004, 12:59 PM
Faded's Avatar
ATM! Pro Class
 
Join Date: Oct 2003
Last Online: 07-21-2020 04:23 PM
Location: Idaho... No, U-da-ho.
Posts: 3,395
Default Re: 2002 cr250 surging?

Did you happen to check the float level while you were in there? It needs to be set @ 15mm otherwise you're chasing your tail. If you've verified this then I'd try going in (clockwise) 1/2 turn on your air screw to see if this helps.
Reply With Quote
  #4  
Old 01-12-2004, 01:03 PM
Mecrazyperson's Avatar
Banned
 
Join Date: Nov 2003
Last Online: 05-12-2008 03:26 PM
Posts: 1,302
Default Re: 2002 cr250 surging?

Quote:
Originally posted by Faded
Did you happen to check the float level while you were in there? It needs to be set @ 15mm otherwise you're chasing your tail. If you've verified this then I'd try going in (clockwise) 1/2 turn on your air screw to see if this helps.
Faded is the man of CR Carbs!! Honda For Life!
Reply With Quote
  #5  
Old 01-21-2004, 06:51 PM
Beginner Class
 
Join Date: Jan 2004
Last Online: 12-22-2007 06:39 AM
Location: So. NH
Posts: 9
Default Re: 2002 cr250 surging?

I have an 02 with the same exact problem. I am currently running an s-8 nozzle, 35 pilot, 1.5 AS, 430 main. I always blamed the s-8 nozzle because it really leans out the bottom end. I'm going to try richer needles (straight section) to combat the problem.
Reply With Quote
  #6  
Old 01-26-2004, 10:17 AM
Faded's Avatar
ATM! Pro Class
 
Join Date: Oct 2003
Last Online: 07-21-2020 04:23 PM
Location: Idaho... No, U-da-ho.
Posts: 3,395
Default Re: 2002 cr250 surging?

dodgeaspen,

I know what your problem is. Hopefully you haven't bought a new needle yet, yours should be fine. The ignition side crank seal is to blame. Mine did the same thing right before I left and it was the seal leaking (air leak). When you pull the clutch in it lets air down through the cable. You can get both seals for $13. The ignition side is easy to change, let me know if you need a breakdown on how to get it out. Good luck.

Last edited by Faded; 01-30-2004 at 09:27 AM.
Reply With Quote
  #7  
Old 01-28-2004, 07:43 PM
Beginner Class
 
Join Date: Jan 2004
Last Online: 12-22-2007 06:39 AM
Location: So. NH
Posts: 9
Default Re: 2002 cr250 surging?

I tried to spray carb cleaner behind the flywheel while running to see if it would suck it in through the crank seal and it didn't......I dunno...
Reply With Quote
  #8  
Old 01-29-2004, 09:51 AM
Faded's Avatar
ATM! Pro Class
 
Join Date: Oct 2003
Last Online: 07-21-2020 04:23 PM
Location: Idaho... No, U-da-ho.
Posts: 3,395
Default Re: 2002 cr250 surging?

Quote:
Originally posted by nmitcheff
I pull the clutch in and the bike surges.
There's the hint, I can almost guarntee that's the problem if this is what it's doing. It's only $13 for both seals (you'll only need the one) and it can be changed in 20-30 minutes (if you have a flywheel puller). It made a world of difference on mine. Let me know if you need help.
Reply With Quote
  #9  
Old 01-29-2004, 02:18 PM
Beginner Class
 
Join Date: Dec 2003
Last Online: 10-31-2011 10:19 PM
Posts: 22
Question Re: 2002 cr250 surging?

I also have an '02 CR250 that does the same thing! I ride the bike hard for a couple seconds and pull in the clutch and the bike has a hanging idle (doesn't want to settle back down to idle rpms). However, if I rev the bike on the stand it comes right back down to proper idle rpm immediately. I've tried playing with the jetting and nothing seems to help. The bike did the same thing even with stock jetting(with some minor spooge from the exhaust). Is this the problem that you guys are experiencing?

Anybody else besides us have this problem? Faded, how did you determine that the crank seal was leaking? Is there any sort of a 'leak down' test that can be performed before replacing the seal to verify that there is actually an air leak? Has anybody else had any luck fixing the surging problem?
Reply With Quote
  #10  
Old 01-29-2004, 02:22 PM
Beginner Class
 
Join Date: Dec 2003
Last Online: 10-31-2011 10:19 PM
Posts: 22
Question Re: 2002 cr250 surging?

Faded,

Could you post some instructions/directions on changing the seal. I can get a flywheel puller, but how do you go about getting the old seal out and driving the new seal without damaging anything. Do I need to lube the new seal w/ 2 cycle oil or assembly lube? Do I need a seal driver or can I use an appropriately sized deep well socket? Any help would be GREATLY appreciated.

Thanks!

Tom
Reply With Quote
Reply

  All Things Moto! Dirtbike Forums > Dirt Bike Knowledge Base and Build Threads > 2-Stroke Dirt Bike Knowledge Base


Thread Tools


Similar Threads for: 2002 cr250 surging?
Thread Thread Starter Forum Replies Last Post
my new bike 2002 cr250 djburkeen 2-Stroke Dirt Bikes - Honda 12 05-23-2009 09:43 AM
1995 CR250 idle surging morevert 2-Stroke Dirt Bikes - Honda 1 08-22-2008 02:28 AM
01 CR250 surging problem Wavfact 2-Stroke Dirt Bikes - Honda 5 09-30-2007 09:23 AM
? 2002 cr250 ? hondacrf450 2-Stroke Dirt Bikes - Honda 9 02-19-2005 10:31 AM
Surging 2000 CR250 jshaw2628 2-Stroke Dirt Bikes - Honda 9 01-16-2004 04:44 PM


All times are GMT -6. The time now is 03:17 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright ©2002-2020, JDub Consulting, Inc. All Right Reserved.