Question about 2005 Yamaha yZ 250 F

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How to clean jets on a yz250f - 2005 Yamaha yZ 250 F

Posted by Anonymous on

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Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. 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.
How to Clean 4 Stroke Carb Part 1
Part 68 Complete motorcycle carb rebuild YZ250F example
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on Jul 31, 2016

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Posted on Jan 02, 2017

sisadsl
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SOURCE: my 2005 yz250f will not idle and backfires on

check valve clearances first. will cause backfire and ide probs
a leaking exhaust gasket or low ignition voltage will cause backfire

Posted on Feb 22, 2011

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1 Answer

Engine wont run after warm up and no choke


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.
yz250f will not run without choke on Texas Offroad Network Forums
04 YZ250F Runs but only with Choke pulled WR YZ 250F
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Nov 17, 2013 | 2004 Yamaha YZ 250 F

1 Answer

Yz250f idles fine but will not rev. It was running golden that same day. i did take all the plastics off and the tank to give it a pressure wash. please help! i have to race


Hi, Carlos_m9331 and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Accelerator pump leaking or no output.
6. Plugged bowl vent or overflow.
7. Fuel level in bowl too low.
8. Restricted fuel supply passages.
9. Plugged jets or passages.
10. Worn or damaged needle or needle jet.
11. The enrichner valve not seated or leaking.
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.
2001 yz250f wont rev
Bike dies when you give it throttle
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Aug 06, 2013 | Yamaha YZ 250 F Motorcycles

1 Answer

2005 yz250f header pipe getting red hot and will not idle without choke 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
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Dec 05, 2012 | 2005 Yamaha yZ 250

1 Answer

How to install a jet for a 2004 yamaha yz 250 f


Hi, Jordan for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. 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.
Part 68 Complete motorcycle carb rebuild YZ250F example
Dirt Rider Magazine
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Aug 22, 2012 | 2004 Yamaha YZ 250 F

1 Answer

Yz250f bogs out at full throttle


Hi, Anonymous and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Accelerator pump leaking or no output.
6. Plugged bowl vent or overflow.
7. Fuel level in bowl too low.
8. Restricted fuel supply passages.
9. Plugged jets or passages.
10. Worn or damaged needle or needle jet.
11. The enrichner valve not seated or leaking.
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.
YZ250F Bogging when throttle twisted quickly WR YZ 250F
06 yz250f bogs down any ideas
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Aug 12, 2012 | 2003 Yamaha YZ 250

1 Answer

Why won't my 2005 yz250f run without the choke on


Hi, James 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 blue links below. Good luck and have a wonderful day.
04 YZ250F Runs but only with Choke pulled
2001 YZ250F only runs with choke on
YAMAHA YZ250F LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jun 12, 2012 | 2005 Yamaha yZ 250 F

1 Answer

My yz250f is taking too many kicks to start it


Hi, Randall and the usual suspects are:
1. Enrichner system plugged, not properly functioning or improperly operated.
2. Fuel overflow.
3. Restricted fuel supply.
4. Gas cap and or fuel tank not venting properly.
5. Plugged slow jet or passages.
6. Inlet system air leak.
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.
Once again YZ250F hard to kick start BUT VALVES ARE IN SPEC WR YZ 250F
http://www.dirtbikeworld.net/forum/archive/index.php/t-23849.html
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Apr 25, 2012 | Yamaha YZ 250 F Motorcycles

1 Answer

When I twist the throttle on my Yz250f it falls on its face even when warm? It has a lot of power but you have to coax the rpm's up, once you get the revs up it is great but after it reaches idle


Hi, Larry and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Accelerator pump leaking or no output.
6. Plugged bowl vent or overflow.
7. Fuel level in bowl too low.
8. Restricted fuel supply passages.
9. Plugged jets or passages.
10. Worn or damaged needle or needle jet.
11. The enrichner valve not seated or leaking.
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.
Yz250f throttle issues WR YZ 250F
idle to full throttle
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jan 31, 2012 | 2004 Yamaha YZ 250 F

1 Answer

My 2005 yz250f will not idle and backfires on decel. i have cleaned carb and all jets even replaced pilot jet. I tried turning the fuel screw in and out slowly with no positive result.


check valve clearances first. will cause backfire and ide probs
a leaking exhaust gasket or low ignition voltage will cause backfire

Nov 16, 2010 | 2004 Yamaha YZ 250 F

1 Answer

Bought a new YZ250F and can not start have tries


4-strokes can be notoriously hard to start. I can tell you that re-jetting the carb can make a huge difference - perhaps consult your local dealer for their recommendations for your riding area. Jets are cheap and relatively easy to change.

Oct 16, 2009 | Yamaha YZ 250 F Motorcycles

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