All Things Moto! Dirtbike Forums

Go Back   All Things Moto! Dirtbike Forums > Dirt Bike - ATV - Suspension Forums > 4-Stroke Dirt Bike Bike Forums > 4-Stroke Dirt Bikes - Honda

Reply
 
LinkBack Thread Tools
  #1  
Old 05-22-2019, 07:59 AM
gusco's Avatar
Pro Class
 
Join Date: Apr 2013
Last Online: Today 09:20 PM
Location: South Texas
Posts: 1,038
Default 2010 CRF250R Air/Fuel Issues??

     

Hi y'all!
I picked up a 2010 CRF250R to flip. Found the service manual. I'm starting to clean it up to clear out the main issue that made it so cheap to pick up: It's hard to start and does not idle well. I figured probably valves.
I turned the idle knob nearly all the way up (literally a few clicks from the last one) and it started better and idled. I also checked the valve clearances last night and they are in spec (.15mm and .28mm). I also cleaned out the throttle body (it was pretty dirty). In disassembling, I found that the wires had been pulled out of the air temp sensor. I put them back, but I'm not sure they are in the correct orientation.
I'll try a test fire later today and report back. Anyone have any ideas of other things to check if it's still misbehaving?
Reply With Quote
  #2  
Old 05-22-2019, 08:24 AM
cowboyona426's Avatar
JOATMON
 
Join Date: Feb 2003
Last Online: Today 09:47 AM
Location: Newport, WA, USA
Posts: 9,591
Default

I'd start with the obvious- fresh fuel, fresh oil/filter, clean air filter. Remove as many variables as you can to make isolating any issues easier.
Reply With Quote
  #3  
Old 05-22-2019, 12:43 PM
ATM! Pro Class
 
Join Date: Jul 2011
Last Online: Today 08:24 PM
Location: Benton, LA
Posts: 4,964
Default

Did you clean the fuel injector?

Paw Paw
Reply With Quote
  #4  
Old 05-22-2019, 02:10 PM
gusco's Avatar
Pro Class
 
Join Date: Apr 2013
Last Online: Today 09:20 PM
Location: South Texas
Posts: 1,038
Default

Cowboy and PawPaw: good suggestions. I sprayed the inlet and outlet of the injector but don't have the proper tool to actuate it and spray through it. I'm either going to have to rig one up or buy one. I came home early from work and it took a bit to start. I'm hoping because the line needed to be primed. It started much better once hot though 1-3 kicks on 4-5 attempts. I'm letting it cool off to see what it does from cold now. If issues persist I'll pull the injector and clean it.
Reply With Quote
  #5  
Old 05-22-2019, 04:32 PM
ATM! Pro Class
 
Join Date: Jul 2011
Last Online: Today 08:24 PM
Location: Benton, LA
Posts: 4,964
Default

It sounds like the injector is leaking due to dirt and thus causing the engine to become flooded and hard to start. This would also explain the fuel line needing priming.

Paw Paw
Reply With Quote
  #6  
Old 05-22-2019, 06:32 PM
gusco's Avatar
Pro Class
 
Join Date: Apr 2013
Last Online: Today 09:20 PM
Location: South Texas
Posts: 1,038
Default

I'll rig something up and report back.

---------- Post added at 07:32 PM ---------- Previous post was at 07:11 PM ----------

There does seem to be some unburnt fuel in there because I've had a few backfires in the exhaust.
Reply With Quote
  #7  
Old 05-23-2019, 10:31 PM
gusco's Avatar
Pro Class
 
Join Date: Apr 2013
Last Online: Today 09:20 PM
Location: South Texas
Posts: 1,038
Default

Got the fuel pump out and the filter was BLACK. Cleaned it up, but I'll be keeping it as a spare as one of the o-rings on the pump body was toasty. So, I'll be getting the filter kit that comes with a new filter and new o-rings. I also took out the injector and cleaned it out. Once I get parts in I'm hoping it fires right up. If not, I guess I'll move on to tps and coolant temp switch.
Reply With Quote
  #8  
Old 05-24-2019, 06:24 AM
ATM! Pro Class
 
Join Date: Jul 2011
Last Online: Today 08:24 PM
Location: Benton, LA
Posts: 4,964
Default

I have seen many cases where when the filter turns Black the pump is damaged due to the reduced fuel flow and reduced cooling to the pump. Using a fuel sock in the fuel tank can and will extend the fuel pump life.

Paw Paw
Reply With Quote
  #9  
Old 05-24-2019, 08:53 AM
Big Maico 393's Avatar
Super Moderator
 
Join Date: Jan 2003
Last Online: Today 02:27 PM
Location: Kingwood,Tx
Posts: 4,603
Default

You might try running some SEAFOAM thru it, once you get it to run for a bit.
Reply With Quote
  #10  
Old 05-24-2019, 12:18 PM
gusco's Avatar
Pro Class
 
Join Date: Apr 2013
Last Online: Today 09:20 PM
Location: South Texas
Posts: 1,038
Default

Thanks, fellas! Once the bike gets running, it seems to run fine aside from a bit of a bog when the throttle is stabbed quickly (it has been running without a filter in the garage though). I have a new air filter and fuel filter on their way. I don't have the correct specialty Honda tools to check fuel pressure (any ideas on how to check it??), but I can check the flow (150 cm3/ 10 sec). Once that system get checked out, I suppose some of the electrical components will be next: TPS, coolant temp switch, air temp switch, condenser.
Reply With Quote
Reply

  All Things Moto! Dirtbike Forums > Dirt Bike - ATV - Suspension Forums > 4-Stroke Dirt Bike Bike Forums > 4-Stroke Dirt Bikes - Honda


Thread Tools


Similar Threads for: 2010 CRF250R Air/Fuel Issues??
Thread Thread Starter Forum Replies Last Post
WANTED 2010-13 CRF250R (midwest) 0honda Classified Ads 3 03-22-2013 12:47 AM
2010 YZ250F fuel leak kosta24 4-Stroke Dirt Bikes - Yamaha 8 12-19-2011 08:37 AM
2010 CRF250R valve lifts and timings seiw 4-Stroke Dirt Bikes - Honda 2 02-05-2011 10:48 AM
2010 Graphics on a 2007 CRF250R Dolmankid 4-Stroke Dirt Bikes - Honda 2 09-08-2010 04:30 PM
2010 kawasaki kx500afx seized up,3rd tank fuel. madmick 2-Stroke Dirt Bikes - Kawasaki 2 08-02-2010 10:59 PM


All times are GMT -6. The time now is 09:56 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright ©2002-2019, JDub Consulting, Inc. All Right Reserved.