having a heck of a hard time with my TM M4-S at the moment, figured i'd see if anyone had any suggestions.
It was running fine stock and has been for probably at least a few years. Decided to throw in an FTK so I obtained a systema M100 kit from un company and an M120 Spring. Also becuase I assumed this rig would need more juice I ran the wiring to the back of the gun and am now running a magpul PTS stock with a 1600 mah Tenergy 9.6v battery. Anyway long story short initially the motor wouldn't pull the spring, we removed the bearing spring guide and put back in the stock one and it will now pull, however I can only get about 50 shots out on single fire before the battery is dead. I have checked any solder joints that I made and put heat shrinks over them to ensure that it wont ground out. The fuse isn't blowing, its just pulling a huge amount of power it seems to make it spin. We followed the shim guide in the FTK... Here is a list of my current parts
TM M4-S w/ Version 2 stock body
SystemA 6.04 mm inner barrel
Systema FTK 110 (but using the stock spring guide which is non bearing)
Systema M120 Spring
Magpul CTR PTS stock w/ rear wiring
Intellect 9.6v 1600 Mah mini battery
Stock EG1000 TM motor
G&G hand grip & foregrip
Here is a summary of the parts in the systema ftk , I believe it uses helical gears as well
http://www.uncompany.com/pageproduct...sp?prodid=2575
Systema Full Tune Up Kit for M4A1 M100 Standard Set
Suitable For:M4A1,M733
Details Content: Gear Set, Cylinder Head, Piston With Head, Spring Guide, Taper Spring, Tappet Plate, Reversal Stop Latch, Metal Bushings, Shims