Hi all. It’s my first post here. Recently, I acquired a STD-SLR which I may say pretty good out of the box. However, natural instinct made me to to upgrades inside the gearbox as below:
FightingBro 480 motor
13.5 tooth metal ladder piston/plunger
PEEK tappet plate
PEEK nozzle tips
Metal cut off lever
Everything went well except for the semi auto function. Its just stuck and the gears turned very hesitatingly like not enough power from the battery. Full auto works a charm. The original nylon tappet plate snapped during the process but that perhaps caused by me.
The best thing is, my friend did a custom build SLR and have no problems at all with almost the same spec.
I have tried to trace all possible issues. Narrowed down to:
a) The metal bevel gear only have 4 notches, compared to nylon STD’s 6 or 8 notches. Could this be an issue?
b) I have tried to simulate the single mode cut off mechanism when i opened the gearbox housing. When turning the sector gears, the cut off lever does not really engaging smoothly. Could this be the trigger switch module too tight? This is i believe where the parts from STD company as opposed to custom SLR builds.
c) Shimming the gearbox (although the engraving says Jingji SLR) is PITA. No matter how hard i tried, the gears will have some kind of restrictions when i apply even a tiny pressure on the nylon shell by hand. Yes, its nylon but not really a sturdy one.
d) i used 4 different 11.1v batteries, no sign of any improvements.
e) adjusting motor height doesn’t do anything except for less noise.
I know, there is a thread for this:
But maybe we could find out the real culprits and solve this issue with a discussion here.
I’m suspecting the trigger switch box and bevel gear’s 4-notch design could be the cause.
Cause the semi-auto was perfect in stock gearbox setup.