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DRZ idle and backfire probs

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2006 DRZ400E - had a problem starting the bike a few weeks ago and mechanic found that the inlet valve was closed, so he set it to spec. I had the carb out and cleaned it prior to this thinking that it was the problem. After returning from the shop it now wont idle and then sometimes it idles really high. The idle screw does not make much difference. It also backfires when decelerating but not on acceleration. It sometimes runs on as well. I have no trouble starting it and when on the gas, it runs fine. Any ideas?

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You have an air leak (most likely here) or a plugged/partially blocked pilot circuit . First step would be with it idling spray starter fluid ,WD-40 , propane , ect.. around the carb boot and front of carb , around the choke nut and see if the idle suddenly alters at a spot , that would be where your leak is at.

 

 

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