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Gear timing is a myth...doesn't exist...but you do need to make sure the nub of the sector gear is not directly under the tappet fin and it's never a bad idea to make sure that the sector gear teeth are started into the piston when you reassemble.
Do you have the port of the cylinder furthest away from the front of the mechbox? If you have it reversed (i.e. the port at the front) you'll end up with a very low FPS.
Did you put the spring in the right way? If you have a non-linear spring (i.e. there's a tighter bunch of coils on one end of the spring than on the other)...the tighter pack of coils goes at the rear (i.e. closest to the spring guide).
Those are the obvious/easy ones...then you get into the tougher ones that deal with air leaks.
1. how is the compression of the piston head/cylinder without the nozzle?
2. how is it with the nozzle on but in the extended position?
3. how is the airseal between the nozzle and the hopup unit/rubber? (that it's cycling nicely is a good first sign that all the parts are fitting)
Best of luck,
Tys
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