MX-4 Build

[LTO_Dave]

So this thing has been sitting as parts in plastic bags for almost a year, so I decided to build it. I still need a bunch of parts to finish it off, but it's a good start. I have some NIP wheels but not enough screws to attach them to the hubs.

While doing the build I found several oddities like these:

- The front diff halves are black delrin or nylon. Possibly from an MR4-BC touring car?
- Both diffs have a Stealth-like thrust spring under the thrust washers and balls. The instructions show to use a small spring washer instead.
- The front c-hubs use kingpins like my YR4-M2 cars use. The instructions show to use a screw with a shim instead.
- The center shaft has a drive pin hole at both ends, while only one is used for the one-piece center pulley and spacers fill the gap on the shaft.
- The screws for the bulkhead caps needed to be much longer than those shown in the instructions because the caps seem thicker.

Here's what it started out as:



And here it is now:

[59burst]

yeah I remember your old thread here
http://www.rc10talk.com/viewtopic.php?f=29&t=36528

I'm still after the aluminum CVD bones but no good luck yet

[aip47-2008]

yeah I remember your old thread here
http://www.rc10talk.com/viewtopic.php?f=29&t=36528

I'm still after the aluminum CVD bones but no good luck yet

Should have asked me. I know where they are.

[LTO_Dave]

There was a pair of NIP gold CVD's that came up on ebay a while back from Canada. But I think they were $50 or $60 and no one bid. That's more than I paid for this entire car!

The part number was ZM-424A...not sure if that's the front or rear set.

[59burst]

yeah I remember your old thread here
http://www.rc10talk.com/viewtopic.php?f=29&t=36528

I'm still after the aluminum CVD bones but no good luck yet

Should have asked me. I know where they are.

didn't know you got MX4 parts too

[59burst]

I see your MX4 has wide wheel hubs and pre MX4 kingpins. one of the things I like from MX4 is the new kingpins with flanged sleeves and normal 3mm screws. I had many bent, and sometimes broken aluminum kingpins from YZ10. and the old kingpins ruined the C hubs as well

btw, this seller has aluminum hardwares and Ti screws for YR4. and most of them work for MX4 too. even the pricing is great
http://www.ebay.com/itm/261966676139

[LTO_Dave]

I see your MX4 has wide wheel hubs and pre MX4 kingpins. one of the things I like from MX4 is the new kingpins with flanged sleeves and normal 3mm screws. I had many bent, and sometimes broken aluminum kingpins from YZ10. and the old kingpins ruined the C hubs as well

Those are the kingpins it came with, but I'll keep an eye out for the sleeves and change them when I find a set. I noticed the rear wheel hubs were wider than the fronts and the ones shown in the instructions were all the same width. I'll admit I don't know a lot about all the Yokomo part variations because there seems to be a lot over the years. But I'm slowly learning.

[LTO_Dave]

I gathered up enough screws to bolt up the wheels. I have a set of NIP wheels, but the used ones pictured cleaned up pretty good. I also added some Orion V-Max 2000 cells...still need a left side holder.

Anyone know what the part numbers are for the Hot Laps tires included in a new kit? I have Hot Laps TF-390's on the front, but Pro-Line Fuzzies on the rear.

[LTO_Dave]

I stumbled across the September 1998 RCCA issue online with an MX-4 article, and found some part numbers for the option parts.

ZM-117G - graphite upper deck and link plate (F/R)
ZM-118GL/ZM-118GR - graphite battery plate (L/R)
ZM-200L - lightweight servo saver mount
ZM-301G - graphite front bulkhead support
ZM-302G - graphite front upper I-arm support
ZM-304S - lightweight motor plate
ZM-408S - suspension-arm pin set
ZM-425A/ZM-422A - MIP aluminum CVD (F/R)
ZM-712G/ZM-722G - graphite shock tower (F/R)
BB-84-4 - servo saver bearing

[59burst]

it looks great with the new wheels and orion matched batteries.