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The MR4-BX is the pinnacle of yokomos many years of 4wd competition.  Starting over 20 years ago with the chain driven YZ-834b "Dogfighter" which was gear driven to the rear wheels with a chain to the front, driving a spool front diff with one-way bearings in the hubs. Then the 1988 belt driven YZ870c "Super Dogfighter" with more modern twin belt front and rear to ball differentials.
The MR4-BX follows a recent trend back toward saddle pack layouts where the weight can be better balanced and centralised.
The assembled BX car looks a little similar to the YMP (Yokomo Miracle car Products) mid motor conversion for the MX4 which was made by Masaki Hirosaka and never really sold outside of Japan. That car used a central motor with saddle pack configuration, all in the then fashionable silver surface (ssg) carbon fibre.

The MR4BC Special superceeded the MX4 as Yokomos top line racer and had some good success in the hands of some talented drivers, but the car wasn't as successful in the hands of most people being a very lively car.
The BX is all new however, there is nothing borrowed from previous cars, from the ground up this car is new and ready for competition at the highest level.
YMP mid motor conversion for the MX4

The Yokomo MR4-BX comes in a larger than average box with built-in carry handle, decorated in a carbon fibre effect with chrome writing, very aesthetically pleasing and swish.
Inside the box, everything is laid out, nothing fancy, just large bags filled with smaller numbered stage-bags, some wheels and a body parts, no tyres are supplied.  There is even a little spare room inside the box.

The manual in my early kit was entirely in Japanese but with excellent diagrams which make it fairly easy to assemble with a little experience. No decals or window masks are supplied in the kit.

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