Backfire is odd if the valve and ignition timing were good before and weren't touched. Just read in this other thread that jet valve malfunction can cause backfire and loss of power:
http://www.mightyram50.net/vbulletin...ll=1#post86167
The Weber conversion doesn't engage the jet valves at all, so you can try temporarily disabling them by removing their lash adjustment screws from the rocker arms under the valve cover.
That said, this may not help if any jet valve(s) got damaged. Look up "jet valve eliminator" for a kit of plugs to replace your jet valves; they just unscrew from the head like spark plugs, tho' you need to remove the rocker assembly to get at them. You'll also need a deep 14mm socket.
Been meaning to do that job myself, have read that the easiest way to remove the rocker ass'y is to remove the cam sprocket first. There's a hook provided to hang it on, so you won't lose cam/valve timing or have to mess with the timing chain. Keep track of which cam caps went where, so you can return them to their original positions on reassembly.
Originally Posted by SubGothius
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