Kyosho D series 4wd Center Differntial - Motor Mount - Bearing ? Ideas

[Gee]

The question/problem here is getting the DST center differential to work with the RCM Kyosho motor mount.

DST Conversion thread PICS.
http://www.rc-monster.com/forum/showthread.php?t=17258

At the bottom of this thread there are pictures specific to this thread.

Why it doesn't work:
Problem with the Kyosho D series of 1/10th 4wd that Kyosho is putting out is the center differential output shafts require a 12mm bearing so they are using a 12x18x4mm bearing for the center differential. All of Mikes current RCM motor mounts fit bearings that are -- x 16 x 4mm. 16mm or less except for one the OFNA Ultra IIRC. It takes a 19mm bearing.

The 1/8th scale center differentials that I have are all approx. 5-6mm wider/longer then the 1/10th scale differential in question. Using a 1/8th scale diff would require more mods/drilling the chassis and different length center shaft (probably). Will hold off on that option until there are not any others.

As you look down the list of options I came up with. The odds of it actually working get better the higher the number. All the options using the RCM Kyosho mount will require the steering servo to be mounted on the other side of the chassis.

1. Use the Ultra Motor Mount then you would need a 19mm bearing. The inside diameter needs to be 12mm for the differential. I only found 12x19x4mm bearing in kits there were made by Acer for $100.00 and those have been discontinued. Not even sure if the mounting holes would match up with the Kyosho chassis.

2. To find a bearing that would work with the RCM mount and the Kyosho center differential would need to be 12x16x4mm. This would be the easiest if they could be found. I had no luck finding any bearings of that size.

3. Take the RCM Kyosho mount and increase the size for the bearing from 16mm to 18mm. I have the RCM mount here for my truggy and have looked it over. There is enough material around the current hole to increase it to the 18mm but it will require some patience and a steady dremel. At it's narrowest spot where the bearing will ride it is 20mm. That leave 1mm on each side. I have a hard enough time drawing a circle if I am tracing it around a glass. It will be a challage to get a real nice one for me. Easy to see what I mean in the picture.

4. Replace the Kyosho center differential with a CRT .5 center differential. Then use this with the RCM Kyosho mount. That would require a bearing of 10x16x4mm for the RCM mount side and also a mount from the LS10 center differntial or CRT. 5 for the other end with the LS10 10x15x4mm bearing. I did find the 10x16x4mm bearing at A Main.

http://www.amainhobbies.com/product_...ducts_id/22757

The only problem with this option is just as you see above buying the crt .5 center differential and spur and mounts. For me personally, I would like to keep the Kyosho center differential setup with the plastic spur. I don't care too much for the metal to metal gear mesh.

I’m going to try to avoid #4 for now. There also is the custom motor mount. I made one from 3/8” lexan that is working but a picture would only bring out the worst in you normally well manner people. :) Hopefully, the next one I am making will be done well enough I can take a picture to show you guys.


Has there been a break through on a plastic spur that fits the CRT .5 differential?

Anyone have the hot bodies center differential? I have the crt .5 in my LS10.

Does anyone know where to get a bearing that would work for #2 above. Only one bearing is needed. Just one little bearing and everything would work out.


Any Comments/ideas would be helpful.

Thanks again for your help guys.

Kyosho Center DIfferential



RCM Kyosho Mount



Kyosho DST Center DIfferential Bulk