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The wheel drive hexes on the vintage cars have a taper fit to the axle shafts. If they are slipping, it might be due to a loose wheel nut. The drive hexes on the re-release cars are pinned to the axle shafts so they can't slip. Assuming that the dogbones and other drive train parts are in good orde...

Thanks. I'll work on diagnosing it, though I was hoping to determine whether I have to break down the gear box before actually doing so. What is the "friction fit wheel adapter?"

Also, when I would hold the car off the ground and hit the throttle, only 3 wheels would spin.

To be clear, the chain moves, but the wheels don't (or only slowly). This happens if I press it more than just a very slight amount of throttle. If I press the throttle slightly, I can slowly increase the throttle and speed will build.

Does this sound like a loose chain?

I got my optima up and running. I think there's something awry with the drivetrain, though. I can get it moving, but I have to start it slowly and build speed. If I gun it, the chain slips. I'm assuming if the differential was stripped, it wouldn't run at all. Is that right? Any ideas as to what cou...

The metal servo mount arrived, and it's nice. servo mount 2.jpg However, it does not fit the screw holes on the base plate. servo mount1.jpg I'm debating whether to drill through the plate to be able to mount it. As of now, the servo is mounted with tape onto the plastic piece that hangs down. It wo...

By the way, even if there are no definitive answers to my questions, I'll take anecdata like "Ive run this hard for 2 years without problems," etc. Trying to make a reasonable cost-benefit analysis here. Thanks!!

So here's my q (for either of you): Does the slipper clutch of the re re do a good job protecting the gears? The reason I ask is that I asked the guy at my local RC shop if I should do the upgrade and get a modern brushless motor and esc and he said it doesn't always work and it would probably resu...

Also, check out this torque limiting clutch: https://www.ebay.com/itm/RC-Kyosho-Option-House-Torque-Limiting-Clutch-16-tooth-for-Optima-Ultima/371562707099?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D44040%26meid%3D19eec03dc03a4154acfd293a6895c13a%26pid%3D100005%26rk%3D2%26rkt%3D4%26sd%...

So here's my q (for either of you): Does the slipper clutch of the re re do a good job protecting the gears? The reason I ask is that I asked the guy at my local RC shop if I should do the upgrade and get a modern brushless motor and esc and he said it doesn't always work and it would probably resul...

Thanks for all the info. Those parts are from nitro-master and I was contemplating upgrading to the slipper clutch, but I did not realize all that it entails. After I took that picture, I found the original spur gear. So all I need to restore it to the original configuration, I think, is the pinion ...

Here are some pics:
Thanks for the help, thus far.

The new mount is on tree OT205 and there's one posted on ebay right now: https://www.ebay.com/itm/New-Kyosho-Optima-Battery-Holder-OT205/323264517965?epid=24010862452&hash=item4b4411174d:g:3FsAAOSwfLxbAQVA:sc:USPSFirstClass!35058!US!-1 Or, you could order if from Kyosho America: http://www.kyos...

I recently found a vintage optima someone gave me over 20 years ago. It's missing lots of parts, but I have been restoring it over the past couple of weeks. One thing that seems a bit odd is that the steering servo was only held in place by a plastic tie wrap. It seems like there ought to be a part ...