Question about 2003 Yamaha YZ 250 F

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Every time i lean the bike over 1980 yz 250 gas just pours out the overflow and it wont start. What is wrong?

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The float in the carb is stuck open. Remove the float bowl, dump out the gas and trash in it then spray the float needle area while gently lifting then dropping the float. The needle should free up. Put the bowl back in place.

Posted on Mar 20, 2011

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Posted on Jan 02, 2017

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1 Answer

1980 yz 50 won't run with choke off


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.
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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.
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1 Answer

Bike spits and sputters at top end


Hi, Johnny and the usual suspects are:
1. Inlet system air leak.
2. Enrichener valve not seated or leaking.
3. Damaged or restricted fuel tank vent system.
4. Restricted fuel supply tract.
5. Dirty or damaged air cleaner element.
6. Plugged bowl vent or overflow.
7. Worn or damaged needle or needle jet.
8. Vacuum piston assembly malfunction.
9. Loose or plugged main jets or passages.
10. Improper float level.
11. Accelerator pumps inoperative.
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Dec 17, 2012 | 2003 Yamaha YZ 250

1 Answer

Problems with stalling at low speeds and not idling well


Hi, Jonathan and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
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2001 2013 Yamaha YZ 250 Service Manual YZ250 Moto Data Project
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Jan 02, 2012 | 2005 Yamaha yZ 250 F

1 Answer

When i try to start my 03-250 ninja gas pours out of the exhaust


you need a carb clean. your float needle valve assambly is not functioning properly. could be something preventing the float needle from closing all the way.

May 10, 2010 | 2008 kawasaki Ninja 250R

3 Answers

1980 Rm 250 wont start and backfires


my carb was doing the same thing and i just took it off, took it apart cleaned it out with the air nozle on our compresser and a butter knife to cean out the stuff on the bottom of the bowl, reset the float and it was all good.

Jun 18, 2009 | 2003 Suzuki RM 250

1 Answer

My 01 yz 125 wont start with kick start,n loses power in low rpms


sounds if you picked up some water/dirt in fuel when was low

clean fuel bowl and flush carb by drain port if still ruff then remove carb for cleaning

May 19, 2009 | 2003 Yamaha YZ 250 F

2 Answers

The bike some times starts ok and outhers not atol and back fires


Try draining your carb(s). You may have water in them or your tank. Also try puting sea foam into your gas to clean the carbs up. Read the directions on the can before pouring in though.

Mar 09, 2009 | 2003 Yamaha YZ 250 F

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