Question about 2002 Yamaha TT-R 225

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Need factory setting for a ttr 225 fuel mixture screw

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  • Yamaha Master
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Hi, Slayport it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
7. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
8. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
TTR225 air screw adjustment
Life On 2 Wheels
http://tjsconcepts.com/ttr225/TTR225_Service_Manual.pdf
OEM parts for Yamaha
Yamaha TTR225S Owner Manual

Posted on Jun 01, 2017

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Posted on Jan 02, 2017

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SOURCE: will an 2000 ttr 225 wiring harness fit in an 01 ttr 225

Yes, a 2000 harness should fir a 2001.

Posted on Apr 26, 2009

miket756
  • 2702 Answers

SOURCE: How do I set the Air Fuel Mixture on my 2003

to do this right you need a CO meeter or your just gessing if its right!

Posted on Feb 05, 2010

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My husband touched the carb settings on my sons new 2007 ttr 50. I read the manual to try and find the number of turns to return to stock settings. Can you please please help!


The carb mixture screw may add air or fuel, depending on the model. If the bike will idle it can be adjusted without knowing the factory setting. What you want is the highest idle that can be achieved using just the mixture screw, not the idle setting screw. Start the motor, then slowly turn the mixture screw in. If the idle speed increases, continue in that direction. If it slows and becomes rough, turn the screw back out until you reach the highest idle speed. That will the correct setting for the bike at your altitude.

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Yamaha ttr 250 carb faults


Hi, Npautos 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.
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http://doc.razorscript.com/moto/yamaha_ttr250_service_manual.pdf
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Apr 08, 2013 | 2003 Yamaha TT-R 250

1 Answer

Ttr 230 does not start cold


Hi, Johanvn 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.
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Dec 11, 2012 | 2008 Yamaha TTR230

1 Answer

Ttr225 dies when i give it gas


Hi, Anonymous 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.
13. Multi carburetors not in sync
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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http://tjsconcepts.com/ttr225/TTR225_Service_Manual.pdf
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Feb 03, 2012 | 2003 Yamaha TT-R 225

1 Answer

04 ttr 225 carb appears to be gummed up. Full throttle is OK but need choke on full to idle and run at slow speeds


Hi, Shall582 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. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the blue links below. Good luck and have a wonderful day.
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http://tjsconcepts.com/ttr225/TTR225_Service_Manual.pdf
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Jun 29, 2011 | 2004 Yamaha TT-R 225

1 Answer

2002 yamaha ttr 225 idles high when let off gas but eventually idles down on its own and hard to start when cold with choke or without


Hi, David and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
10. Multi carburetors not in sync.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links blue below. Good luck and have a wonderful day.
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http://tjsconcepts.com/ttr225/TTR225_Service_Manual.pdf
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Jun 21, 2011 | 2002 Yamaha TT-R 225

1 Answer

I TOUCH THE CARBURATOR OF MY SON TTR 50.. WHAT CAN I DO TO PUT BACK STOCK SETTING...???


the carburetor settings are easy : 1- locate the screw mixture air /fuel 2- wind the screw all the way in 3- unwind the screw 1 1/2 turn and this should be sufficient to set the carburetor back to its original settings for the air/fuel mixture . 4- as for the idling screw , wind it down to suit the revs required

Dec 31, 2010 | 2002 Yamaha TT-R 125

1 Answer

When I start my 2004 Yamaha TTR 225 on full choke and pull back on the throttle the bike starts to die. If I let off the throttle it will sound normal again. I have cleaned the air filter and I have...


Remove the fuel tank , side covers , and seat. Take your carburetor off , clean and inspect it. Check the carburetor top diaphragm. Make sure all the jets are in place and the passageways through the body are clear as well as the jets are clear. Squirt carburetor cleaning fluid through them. Most of all inspect the intake boot for rips tears and separation. Make sure your mixture screw is set to 2 full turns. Reassemble and your problem should be solved.

Oct 15, 2010 | 2004 Yamaha TT-R 225

1 Answer

How do I set the Air Fuel Mixture on my 2003 Yamaha 225 TTR with a Mikuni Carburetor ?


to do this right you need a CO meeter or your just gessing if its right!

Feb 05, 2010 | 2003 Yamaha TT-R 225

1 Answer

2007 ttr 125 wont start unless hand is over the back of carb. also wont idle.At mid and high range it runs fine. There are no air leaks and no adjustment screw for the air/idle just a factory plug.


Time for carb cleaning, blow the jets with compressed air and check the fuel level in the float chamber, adjust if necessary.
Tht factory plug is where the air-mixture screw is and tht plug has been kept there for non tampering!
That screw is factory set.
Basically its the primary jet which is a problem in your bike's carb, but all in all might as well blow both of them.
Hope this helps!

Nov 13, 2009 | 2002 Yamaha TT-R 125 L

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