My honda xr 250 mototrcycle wont idle, i took the carb off to clean it out cuz it had been sitting with gas in it for awhile. so im wondering if when i cleaned it if i changed my jetting?

has nothing to do with valve clearance!
You are running to lean at idle.
Your idle jet is most likely plugged up!
Do not drill out, blow out with carb cleaner and compressor. If it is too plugged up replace it. Mixture screw should be at about 2 turns out.

Im guessing right now it will only idle with the choke on, or run with the choke partially on. When you let off the throttle off, deceleration it back fires the most.

I do recommend having a trained tech service the carb!

I have a 2001 Sukuie Morauder 800. I have had leaking gas under the motor. The rubber tubes from the gas tank to the carubater needs to be replaced. With age the gas wareouts the rubber on these tubes.

Have you tried using a spray carburetor cleaner? Also, is the fuel filter clean?

clean the carb there are some tiny holes in the xr carb that can corrode closed if if the bike sits for a time
fit a new plug
check the valve clearances
put the ignition plate back were it started

your problem is a clogged carb. clean float valve, main jet and idle circuit with a can of spray carb cleaner.

disconnect fuel hose at carb and see if gas flows.

reconnect hose and open float bowl drain valve. If no gas tap on side of float bowl with plastic end of screwdirver to free up float.

still no gas? remove float bowl and try to shoot carb cleaner into the fitting for the gas line from tank.

if gas flows now then put it all back together and it should run

if not then remove carb and clean carb passages, main jet, idle circuit.

you have now experinced sitting syndrome. its caused by the gas going bad and building up varnish in your carb. have your carb cleaned and it should be okay. anytime your going to let the bike sit for awhile use a good fuel stabilizer and follow the manufacturers recomendations on the bottle. this is a good idea for any small engine.

The stock pilot screw setting is one and one half turns. The usual problem for not idling is that the slow speed circuits in the carbs are still plugged up. Secondary cause is usually that the carbs are not in sync > The carb slides don't all move upward at exactly the same moment. If you haven't installed new spark plugs, do it. Soak the carbs in denatured alcohol after removing the slides and float bowls. Finish with spray carb cleaner and compressed air. Spray into all the drill holes, ( circuits ), in each carb. Install an in-line fuel filter to prevent trash from the gas tank getting into the carbs.

both carbys will have a main jet

make sure theres no **** on the bottom of the gas tank blocking the intake to the carb.

Carb needs to be cleaned, plus air filter & sparkplug changed & cleaned