Question about 2003 Honda XR 250 Motard

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Back fireing wont idle

Had to set idle up, hard to start, backfires when you let off throttle

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

Posted on Feb 11, 2009

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check the firing order after the tune up

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Back fires when I shift up in gear


If it backfires immediately when you engage the clutch and release the throttle, you have a carburetion issue. Fuel mixture is too rich at idle. (If you have fuel injection, your controller is set too rich at idle.)

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It back fired and when i started up it wont idle, runs at 60 mph without using gas


Don't know what caused the backfire, but often the pressure from the backfire causes a vacuum line to come off (usually a large one; brake booster, PCV or similar size). this lets extra air past the throttle butterfly and raises the idle speed. find your vacuum leak and the idle speed should return to normal.

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Have 1979 kawasaki kz750 twin, how many turns on carbs to set correct fuel settings to keep from backfire


Your bike's engine is back firing ..this could be because of low level of fuel in the float chamber.
If you have cleaned the carbs , please recheck and reset the float chamber level.
Secondly both of the carburators have to work exactly at the same time..if they dont it will also kinda back fire and have uneven idling...check this too.
As for the air mixture screw .. once all is fine ....tighten the screw slowly all the way in to the last thn unscrew about 2 and half to 3 turns outwards .....you will notice the improvement of the idling.... its adivseable to check the valve clearance and reset them to specs.
Hope this helps!

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Back fires when you let off gas


These will backfire when you let off the throttle if the idle is set low. When set low enough to sound "right" you will get the backfire. Set the idle up a bit and you will lose the backfire but it will sound like it is idling a bit fast.

Sep 25, 2009 | 2005 Suzuki Boulevard S40

1 Answer

Hard start when air temp is cold, backfires when warm


Try this, remove (MAF) Mas Air Flow sensor,(be sure key is OFF) so you don't set a trouble code when disconecting wire conector, with some throttle body/air intake cleaner from the outlet side of MAF, spray the sensor clean, let dry, reassemble.Remove snorkle from throttle body, and with a old tooth brush, clean throttle body& plate with cleaner, may take a couple of cans if throttle is badly 'coked' up. Hope this helps.

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