Question about 2005 Yamaha yZ 250
Posted by Anonymous on
Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
Dirt Rider Magazine
YZ250F won idle without choke solved Intake Jetting Fuel Injection
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
Posted on Jul 25, 2016
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Any reason you had to change the jetting??New pipe,Intakes.?But,even though you may have it a bit rich on idle the pipes WILL get very hot,very quickly without some sort of air flow over the front of the motor and radiator.At the very least,have a strong fan blowing directly on the front of the motor if you are going to let the bike run and you are not riding it.I have seen the white plastics in front of the radiator distort from the radiant heat.Don't idle them for in more then 20 seconds.It can do heaps of damage.Ride the bike and see if its running well.When you stop,turn it off.All the yz and wrf will get very hot at idle.Hope this helps
Posted on Jan 17, 2010
SOURCE: my header pipe on my
If you have changed the jets you may have to try a different size. I suspect that the pipe is getting red hot from to much fuel . I think your problem is the choke. It may be sticking, have a bad plunger, or may not be closing all the way. Start your inspection there.
Posted on Dec 13, 2010
Tips for a great answer:
Nov 02, 2016 | 2006 Suzuki RMZ 450
Aug 19, 2013 | Yamaha YZ 250 F Motorcycles
Sep 09, 2012 | 2005 Yamaha WR 450 F
Aug 27, 2012 | 1982 Yamaha XJ 650
Jun 12, 2012 | 2005 Yamaha yZ 250 F
Dec 13, 2010 | 2004 Yamaha YZ 250 F
Mar 06, 2010 | 2003 Yamaha YZ 250 F
Jan 17, 2010 | 2004 Yamaha YZ 250 F
Nov 21, 2009 | 2003 Yamaha YZ 250
Mar 21, 2009 | Yamaha YZ 250 F Motorcycles
Oct 31, 2017 | Motorcycles
28 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: