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most fuel mixture screws are set initially by turning it all the way in and then backing out 21/2 turns. This should allow start and idle and final adjustment can be done to fine tune it. Check that the idle solenoid is working as it will shut off the idle circuit if it is not
Looking At Starboard Side Of Engine The Screw That Has A Spring Behind The Head On The Upper Part Of Each Carb Is The Idle Air Srew Pre Set Is From Lightly Seated In turn out 2.75 turns then adjust whilst running to obtain correct idle ,what you do to one do to all
It may be factory set but it cannot determine the type of thread you use, on the bobbin case there is a screw if the thread does not pull through with slight resistence and is tight then slacken the srew anti clockwise about a quarter of a turn and test, repeat if necessary, top tension 4 or 5
You need to get your mixtures right. It is probably running to lean. wind your low mixture screws in counting every half turn as you go so you can remember the factory settings (ex. L 1 & quarter turns, H 1 & half turns). Then wind them back out, winding the low mixture out a lil further (eigth of a turn) while running, rev it a bit, try a cut with it, then wind the High mixture screw out a bit if it hasnt improved. You will eventually stumble on the right mixture for the weather conditions.
Hi, M420blackbur 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. 2004 CR250 idle adjustment and air screw Life On 2 Wheels CR250 2002 2003 pdf http://www.partsfish.com/page/oem-parts-for-honda Honda CR250R Owner Manual Competition Handbook
Generally there is no specific setting, however nearly all carby's default setting is one and a half turns out. Whatever "air" you are running the bike in will determine optimum setting for this. Altitude, humidity, fuel type, sparkplug range all play a small part in this. Trial and incremental settings is the only way without diagnostic bench testing equipment. Cheers.