Got my KWA DMR gearbox open for maintenance and some changes.
This will be my first time using these 5KU 9MM Solid Bushings.
After cleaning my gearbox shells and gears, I decided to get a preliminary run through of these gears under way.
Some initial thoughts:
- The fit is right.
They do not, however, snap in like KWA's stock Ball Bearing Bushings.
They fit like a JG set of solid bushings fit in its respective gearbox shell.
They will fall out if you turn the gearbox shell upside down.
So to close the shells, you have to place the Bushings on the gears first, then close the shell on top of it.
- Shimming is 100% necessary.
For those who want a shimless featured gearbox, this will not accommodate that.
The amount of "play" is quite noticeable.
Matter of fact, the stock KWA gears would not even spin one revolution without some shims placed underneath the Spur Gear. I placed .04mm's worth of shims under the Spur Gear just to get a feel for the revolution of the gears in these Bushings. It was nice and smooth and I like what I see.
These Bushings do protrude farther outside the gearbox shells than the stock KWA Ball Bearing Bushings. I, however, see no issue with the Selector Plate clearing the Bushings as have been reported by some. That may be an issue in a Gen1 Gearbox, but even if I press all the Bushings with gears towards the Selector Plate Side, it still clears with no issue.
Over-all. my first impressions are very good.
There is one Bushing that seems to have a little bit smaller ID than the others, but still fits the gear axle just fine. I will probably bore that out .01/.02mm's just to make sure it is able to spin freely on the gear axle.
Can't wait to see these in action.
Edited by vanevery, 12 April 2013 - 10:55 PM.