Question about 2005 Yamaha TT-R 250

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I have a ttr 250 the plug is going in crossthreaded there is no spring on the mixture screw and it is very spluttery and backfireing what shal i do

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The only thing you can do with the sparkplug is you will have to remove the cylinder head ,take it to an automotive enginnering shop,have them machine out the old thread and insert a helicoil,hope this helps

Posted on Jul 16, 2009

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How to adjust the carburetor on a 1997 Honda VTR 250


Hi, Anonymous 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.
8. 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.
9. 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.
VTR250 org View topic Carburetor Tuning and Strange Happenings
Honda VT250F Carb maintenance
Honda VTR 250 Workshop Manual
http://www.partsfish.com/page/oem-parts-for-honda
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Jun 01, 2014 | 1997 Honda VTR 250

1 Answer

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

1 Answer

How to fix decelerating backfire on a 2007 Yamaha TTR 90


Hi, Anonymous
COUGHING is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp buildup of oil/gas seepage at the intake manifold to cylinder head or carburetor to intake manifold connection and in rare instances a worn throttle plate shaft and or seals.
POPPING or backfiring on deceleration is usually caused by a lean fuel condition or an air leak in the exhaust system and is generally located where black carbon soot is seen as a flashing build up from any joint connection. This condition can easily be remedied by removing and cleaning both joint pieces and reassembling with high temp silicone and torquing the exhaust clamp to the proper spec.
SPITTING is usually caused by a faulty accelerator pump and or nozzle, or the float bowl needle and seat leaking and overflowing through the main jet mixing well nozzle, or the air-fuel mixture screw is adjusted too lean.
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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https://www.tlplanet.com/forum/main-forums/tls-tlr-main-forum/35712-backfire-on-decel
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Jan 05, 2012 | 2007 Yamaha TTR 90

1 Answer

Need factory setting for a ttr 225 fuel mixture screw


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
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Sep 02, 2010 | 2002 Yamaha TT-R 225

1 Answer

I have a 2006 Kawasaki Bayou 250 it is always fowling spark


does it backfire when revving down? are your spark plugs coming out black? if yes, you need to lean out your system a little by adjusting the mixture screw on the carb.

May 13, 2010 | Motorcycles

1 Answer

YZ250F is back firing when let off the throttle. Would hot start sticking cause this problem?


no buddy your mixture is too rich which means to much fuel is going in and not enough being burnt so the access fuel goes in the exhaust and then gets burnt in the exhaust which is a explosion so you get a back fire to cure this problem you need to screw the mixture screw in which is located on the carb a picture below will demonstrate turn this screw 1/4 of a turns in this will decrease the amount of fuel going in and stop backfiring good luck budbe6e0ee.jpg

Aug 30, 2009 | 2004 Yamaha YZ 250 F

1 Answer

My suzuki sp 400 backfires and it sounds like 'n misfire


hi mate try changing the spark plug and its backfiring because you have to much fuel going into the barrel and all of the fuel is not being burnt so some is going into the exhaust and when you let off the throttle it backfires so on the carb there are 2 screws 1 for idle and 1 for mixture the mixture is the one you need screw it in 1/2 of turn at a time until it stops backfiring ok a picture will demonstrate 3a5087f.jpg

Aug 30, 2009 | 1991 Suzuki DR 350 S

1 Answer

No idle &bacfires on deceleration


hi mate on the carb you will find 2 screw 1 is for the idle and the over is for mixture the idle one will be the furthest out screw it in 1/4of a turns will the engine is running this will take the idle up on the engine and the backfiring is fuel in the exhaust not being burnt so on the over screw on the carb screw that in 1/4 of turns this will decrease the amount of fuel going into the engine if it still backfires screw it in 1/4 of turns again and see what difference it makes good luck

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1 Answer

Ktm 250 sxf 2008 backfires


go on google check the air mixture and altar the air screw on the carb to wot u find on the net easy job thers only 2 screws on the carb

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1 Answer

Yamaha 2002 TTr 250


Hi hoeygatt

Look around your bike near where the throttle cable meets the engine, when you pull the throttle, the cable pulls a quarter circle piece of metal which is connected to a spring, then connected to that should be a screw, that is the idle screw, turn it very slightly, usually clockwise to make the idle higher, and this should sort out the problem.

Please remember to rate this solution as FixYa!

Kind regards
BearWeb

Apr 12, 2009 | 2002 Yamaha TT-R 250

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