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Gear "timing" is a myth, it's only the relationship between where the anti-reversal latch is set in relation to the sector gear position. Enough proof out there based upon experience to prove it. Timing, nah. Setting the two up properly, yes. Some claim that you can set it anyway you want, it'll auto-set itself. In which case if the piston jams full back and won't cycle, no amount of trigger pulling will auto-set that.
I think that most likely the battery isn't able to put out enough juice to supply th motor under load. My MP5 when I ran on 8.4V 600mAh mini-batteries, had a great rate of fire and would last for 1100-1200 rounds. When I put in my 150% spring, the rate of fire dropped about half, and my batteries only lasted about 400 shots. Jumping my battery up to an 8.4V 3300mAh battery made the rate go up a fair bit, but still under what stock gave me. Tried a 9.6V 3300mAh battery, rate went up to almost stock levels. I'll add in that unless the mechbox was properly shimmed (as in trained eye & feel), then it could be done up too tight and causing all kinds of problems.
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