I use the genuine Kyosho bits as per the manual ....
I have been thinking about ways of taming a one-way diff and have a few ideas .... watch this space!!! If I can get that to work then I'll give the FS a go.
As for building the diff properly I have to say the Kyosho diffs are brilliant straight out of the box other than the main diff balls in the kit.
Both ends of my ZX5-SP and my 2 RB5s have all Kyosho diff parts other than Atomic Carbon thrust race balls. Stock diff & thrust plates, Kyosho ceramic diff balls and stock unmodified hardware.
The trick to building the Kyosho diffs is simple .... good grease and don't tighten them up too much from the start!!!!
I normally try to set the diff to just slip when the out drives are held on an old pair of scissors and turn between finger and thumb.
Make sure you shim the diff so there is very slight backlash between pinion and crown wheel when you try to twist the crown wheel away from the pinion. This may feel a little "notchy" when brand new on the bench but trust me, when running the pinion and crown wheel mesh will try to part in a similar way as the teeth climb up each other under load .... if it's loose when new it will quickly wear! They soon bed in and feel great, should take no more than 2 runs to be quiet and smooth, if so then maybe you have them mesh too tight!
Run the car for a few seconds off the ground with one wheel held to settle the parts.
Run the car for about 2 minutes being gentle with the throttle then adjust to the final setting (hold one wheel and spur, adjust until you need proper effort to get the diff to slip when turning the other wheel between index finger and thumb.
There you go, the perfect sliky smooth free spinning diff that never seems to need further adjustment.
If you put a little grease on the diff case joints prior to final assembly there is no way to get dirt in and thus everything lasts forever! Probably need to clean and re-grease the diffs no more than every sixth meeting (about twice a year as the 4wd car only gets used for regionals and nationals ...... the RB5 being so brilliant to drive I always want to run that at any other meeting)!
I'd have to say the only thing to compare with the quality of the Kyosho shocks is their diffs!! Both the best I have come across in over 2 decades of RC racing!
A little off topic but hey .... might be useful for somebody building an FS as a first K' car!
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