MR4-BX worlds front one way

[woodey]

Does anyone know the part number for a one way for the MR4-BX worlds spec. I bought a one way from someone at my local club, and I guess this must be for a standard BX, as the drive cups are really short compaired to the worlds. While it sort of fits, the drive shafts are right on the end of the cups, and pop out when on full droop.

Thanks

[Jonathan]

I know of two part numbers for the one way.

BX-640B & BX-640BF

The BX-640BF came out with the factory edition but fits the original BX also.

I never knew what the difference was, but I suspect it is what you describe.

Here is a pic of my BX-640BF for you to compare to yours for size.

[dummy]

Originally Posted by Jonathan

I know of two part numbers for the one way.

BX-640B & BX-640BF

The BX-640BF came out with the factory edition but fits the original BX also.

I never knew what the difference was, but I suspect it is what you describe.

Here is a pic of my BX-640BF for you to compare to yours for size.

yokomo revised the outdrive cups for the factory version. the original came with tc4 outdrive cups which were a bit short. both fit the worlds edition.

[woodey]

Thanks guys, it looks like I have the BX-640B, as the drive cups are 10mm long, and this is just a bit too short so stop the drive shafts popping out. The BX-640BF might just about do it, but it will not be nice, those dog bones will be running right on the outer limits of the drive cups on full droop, but I guess in the absense of a Worlds specific one way drive cup this will have to do.

I did try a trf-501 cup, but the slots were too small to take the dogbones. Anyone know of a drive cup that would meet the following spec?
shaft diameter 6mm, shaft length 11mm, drive cup length at least 12mm, dog bone slot 2.5mm.

Thanks

Doug

[sparrow.2]

Associated #1730 HD Drive cups ought to fit because they are originally from Yokomo. These go in BJ4's, NTC3's and B44's

[dummy]

Originally Posted by woodey

Thanks guys, it looks like I have the BX-640B, as the drive cups are 10mm long, and this is just a bit too short so stop the drive shafts popping out. The BX-640BF might just about do it, but it will not be nice, those dog bones will be running right on the outer limits of the drive cups on full droop, but I guess in the absense of a Worlds specific one way drive cup this will have to do.

I did try a trf-501 cup, but the slots were too small to take the dogbones. Anyone know of a drive cup that would meet the following spec?
shaft diameter 6mm, shaft length 11mm, drive cup length at least 12mm, dog bone slot 2.5mm.

Thanks

Doug

the revised drive cups are BX-642B. i ran these with no limiters in the front shocks (middle hole arm) and had no problem with the drive-shaft popping out.

i now run the diff in the front and most of the yokomo set-ups for the worlds version i've seen use the diff in the front. why do you want to use the one way?

[dummy]

Originally Posted by Jonathan

I know of two part numbers for the one way.

BX-640B & BX-640BF

The BX-640BF came out with the factory edition but fits the original BX also.

I never knew what the difference was, but I suspect it is what you describe.

Here is a pic of my BX-640BF for you to compare to yours for size.

oops. i just noticed the picture

Woodey, you can buy these drive cups separately. part number is BX-642B.