Question about 1987 Yamaha FZR 250

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Hello could u tell me wat are the correct

Hello could u tell me wat are the correct mixture screw setting are , for a fzr 250 ,

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Turn both the throttle screw and air screw inward until they LIGHTLY seat. Now turn each of them outward 1.5 turns. Whenever cleaning the carb, pay special attention to the items in blue.
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Posted on Jun 27, 2009

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2008 ktm 250 sxf. Can't get a correct response from my fuel mixture screw. Stripped carby and cleaned, set float level, set Jet needle back to factory settings (4 slots from top was 6) fitted an after


Hi, Anonymous you need to make sure you have no intake leaks by spraying some Brake Kleen, Contact Cleaner, Starting Fluid etc. around the intake manifold and seals, if the RPM's go up or down significantly then you have a leak that needs to be fixed before you can continue with the carburetor adjustment.
The engine should be at operating temperature with the enrichener off to set the idle between 950-1050 rpm. Turn the idle skrew clockwise to increase the idle speed and counterclockwise to decrease the idle speed. If you have access to your air fuel mixture skrew you may turn it as well, if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air fuel mixture skrew clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back the skrew out 1-1/2 full turns to establish a starting point start the engine and check the idle rpm's and turn the idle skrew accordingly for 950-1050 rpm if necessary, turn the air fuel mixture skrew 1/4 turn at a time and let the engine settle for about 10 seconds, turn the skrew clockwise for a leaner mixture and counterclockwise for a richer mixture, you are seeking the highest rpm your air fuel mixture skrew can acquire without going past 3 full turns from bottom then resetting the idle skrew back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture skrew all the way in then your pilot/low-speed jet is too big and needs to be replaced with the next size smaller. Final adjustment should be made with a clean air filter mounted to the carburetor.
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.
Woonky Mobile
2008 KTM 250sxf Carb problems
KTM 250 SX 2005 Repair Manual
http://www.partsfish.com/page/oem-parts-for-ktm
KTM 250 SX Owner Manual

Apr 21, 2017 | 2007 KTM 250 SXF

1 Answer

YZ 250 mixture screw settings


http://www.pdfmotomanual.com/index.php?r=site/page&view=manuales&order=t&key=Y&make=1752&lang=ENG

Loads of downloadable manuals on the above link....all free. You might find what you are looking for amongst them.

Feb 08, 2014 | 2003 Yamaha YZ 250

1 Answer

Mixture screw


1 1/4 to 1 1/2 turns out. Dont screw it in too tight or you'll bend the end of the needle.

Jan 02, 2014 | 1997 Honda XR 250 R

1 Answer

1996 Kawasaki ZZR 250 air/fuel mixture setting


Hi, Whiskers_57 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 for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
How do adjust the idle mixture
DIY Accessing and adjusting idle mixture screws ninjette org
Kawasaki ZZ R250 Service Manual Page 2
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Apr 07, 2013 | 1996 kawasaki ZZR 250

3 Answers

Hello I have an 98 yz 250 it will not start when cold I can give it a shot of gas in the air box and it fires rite up and will restart as long as its warm and runs great but will not once its cooled down...


Sounds like you have a carburator issue.
The choke richens (Adds more fuel) to allow a cold start. Have the carb checked by someone with an idea of what to look for. Make sure all passages are clean and clear.
Do a compression test, throttle wide open , you should have at least...at least 100psi to run, but yours should be higher with a new top end.

Mar 30, 2010 | 2003 Yamaha YZ 250

1 Answer

Choke is working only has 5000km on bike and once bike warms up it loads up wih fuel and then dies out all ports are clean i tore the carb a part 3 times what should the fuel|air screw be set at.it must be...


It seems the carb/s flooding with fuel and thus it dies, try to reset the float pin and get the correct level of the fuel in the float chamber.
Standard procedure for air-mixture screw setting is u take the screw right in slowly taking care not to over tighten it as it may damage the tip of the screw.
Warm up your bike's engine and thn slowly turn anti clockwise the air-mixture screw to about 2 & a half turns and observe the engine's idling.
Before you attempt this setting(air-mixture) its better too, to replace the spark plug and set the gap to the specs of your bike's engine and check and adjust accordingly the valve clearance.
Hope this helps!

Jul 22, 2009 | 2002 Suzuki GZ 250 Marauder

1 Answer

Power less and hard to start.


Hi, Ttiimmiiss it could be a timing issue or the list below 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.
Project My 90 FZR250 3LN3
Fzr250 running problems
Yamaha FZR400 1988 1989 Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Apr 19, 2017 | 1990 Yamaha FZR 250 R

4 Answers

Carb adjustment


Hello:

>>The Following is the Instruction File for Setting the Air Mixture Screws. Any Input is Appreciated. The Procedure is the Same for 1 or 2 Mixture Screws, Just Use the Instruction File and Skip Over the Section with the Missing Mixture Screw ( Usually the H Mixture Screw).
>>Now Setting the Air Mixture Screws:
>>****Turn the Idle Air (L) and Main Air (H) Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Set the Throttle Full Open, Start the Engine.
>>Turn the Main Air (H) Mixture Screw Clockwise Until Proper Revs are Obtained. **Carefully Use your Finger and Move the Governor Arm to Rev the Engine (on Chainsaws and Trimmers Use the Trigger to Rev the Engine) Until you Reach Max RPMs (on Chainsaws and Trimmers, the RPMs are Not Set to MAX. Set to Max and then Reverse the Setting Screw 1/4 or 1/2 Turn. If the H Mixture Screw is Set too High; the Engine will be Starved for the Oil in the Gas and Damage the Piston and Jug/Cylinder) and the Engine is Running Proper at Full Throttle Up a Grade. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs.**
>>Now Allow the Engine to Idle. Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required.
>>Now Set the Idle Air (L) Mixture Screw so there is No Hesitation when Rapidly Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.****
>>If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Happy.
>>Thanks.

Respectfully

John

Apr 21, 2009 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

2 Answers

Hi how do you tuneup a yamaha fzr250 2kr, thank you for your help.


Your bike has electronic ignition. There is nothing to set or reset on the timing. Change the spark plugs, adjust the valve lash, change engine oil and filter, clean or replace the air filter, lube and adjust the chain and cables, inspect the sprockets and wheels, add water to the battery if needed, wash the bike. That's pretty much everything the dealer does.

Apr 10, 2009 | 1988 Yamaha FZR 250

1 Answer

Rpm


Normal idle for most bikes should be in the 1000 - 1200 range, but your manual should give you a more exact number. If you don't have a manual, now might be a good time to pick one up.

Nov 10, 2008 | 1994 Yamaha FZR 250 R

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