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Old 03-25-2013, 05:44 AM   #7
Gnarly Adventurer
Joined: Dec 2007
Oddometer: 175
Urals make lots of strange noises at different times. A,"Hissing" sound like air leak I would check compliance fittings, branch pipes to carbs and air box, and vacuum tube from petcock to left carb. A leak from these areas are also associated with an idle rise with a fully broken in rig. Get some WD 40 and at idle spray compliance fittings. If idle rises that is where air leak is. Don't let this go if you have a determined air leak or you could hole a piston. Also post on Soviet and you'll find all the info and assistance you could need. Happy trails...
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