Yokomo YZ-834B

Yokomo YZ-834B "Dog Fighter" is a 1/10 scale electric-powered 4WD radio-controlled vehicle made by Yokomo. Introduced in 1983 for off-road racing, it has been cited by the website, LiveRC, as the first racing specific 4WD buggy[1] The car was marketed in Europe, sold by Graupner, as the Graupner Dogfighter[2][3][4] and in the US by Delta Systems, as the Delta Dogfighter.[5]

Wonder Dog Fighter SE
RPS SE

As the YZ-834B required numerous upgrades and an investment of US$500 (equivalent to $1,166 in 2019) to make it competitive, Yokomo introduced the mail-order only SE 4WD featuring a host of parts that made the car competitive straight out of the box for US$200 (equivalent to $466.48 in 2019) despite being offered with a Yokomo 05R stock motor and a mechanical speed controller.[6][3]

The RPS/Yokomo Dog Fighter SE was introduced following the 1985 IFMAR 1:10 Electric Off-Road World Championships win by Gil Losi Jr. The car was marketed by Ranch Pit Stop (hence RPS), a hobby retailer owned by Losi Jr's father; who later became known as Team Losi three years after.[7]

Ron Rossetti used this version of the car to win the 1986 ROAR 1:10 Off-Road National Championships.[8][9]

Despite it's sucess in racing, including winning the aforementioned IFMAR Worlds, it was critized for it's low ground clearance, which meant it was unsuited to the UK racing.[10]

The YZ-834B was replaced by YZ-870C in 1987.

Year Model Details Known issues
1983 Dog Fighter 834B (not pictured)

Rare original release model with one shock absorber each end, exposed alloy roll bar, yellow wheels and black body pan.
  • Front mono alloy shock
  • Rear mono alloy shock
  • Chain drive 4WD system
  • Front one-way axles with solid center shaft
  • Large bumper, extends to middle of front wheels
  • Rear ball differential
  • Rear anti-roll bar
  • Dog Fighter lexan body with enclosed shocks and exposed alu roll bar
  • 1.75-inch yellow wheels and Dunlop engraved spike tires
  • 05R stock motor for 8 minute race
  • Mechanical speed controller Forward/Break. and with a relay for reverse
  • original cost 19,800 Yen
  • Pristine examples now changing hands for UK£500+
  • The first version of the nylon gears weren't sturdy enough
  • Motor plate was weak and prone to bending if misused. This problem has never been fixed through the last 834B model
1985 Wonder Dog Fighter

(could be late 1984)
  • Thicker chassis with small bumper
  • Upgraded front shock
  • Rear dual shock
  • Torque limiter
  • Improved gears (they made new gears in 1984)
  • Longer front lower arms
  • Reinforced rear swing arms
  • New Wonder Dog Fighter body based on Bolink Funco body
  • New rear shocks leak
1985 Wonder Dog Fighter Limited Edition
  • 360SX Twin Turbo motor for 6 minute race
  • 28,000 Yen
1986 Wonder Dog Fighter SE - 834B SE
  • Super Aero wheels (aka tornado wheels)
  • Hot Laps R-5 2" tires
  • 360SX Twin Turbo motor for 6-minute race
  • 29,800 Yen
1986 Dog Fighter RPS SE
  • Fiberglass Chassis with small black bumper
  • New body and new roll bar
  • Improved shocks
  • 05R stock motor
  • New RPS tires made by Pro-line with 1.75" yellow wheels
  • SE10 Standard Kit
  • SE11 Deluxe Kit (with NMB bearings)

References
  1. "FLASHBACK FRIDAY: Former IFMAR Electric Off-Road Worlds winners". LiveRC.com. Retrieved 5 January 2016.
  2. Denevi 1986, pp. 64-68.
  3. "Yokomo YZ-834B Dog Fighter". RC Scrapyard. Retrieved 2020-06-22.
  4. "Graupner Dogfighter". www.rccarmuseum.org. Retrieved 2020-06-22.
  5. "Delta Dogfighter". www.rccarmuseum.org. Retrieved 2020-06-22.
  6. Howell 1992, pp. 35-38.
  7. LiveRaceMedia. "FLASHBACK FRIDAY: Timeline of Team Losi Racing 4WD buggies". www.liverc.com. Retrieved 2020-06-22.
  8. Kyes 1987, pp. 22-29.
  9. "Yokomo YZ-834B Wonder Dog Fighter". RC Scrapyard. Retrieved 2020-06-22.
  10. Crabb 1988, p. 48.

Works cited
  • Howell, John (December 1992). "Top 10 Innovative R/C Cars of All Time". Radio Control Car Action. Air Age Media.CS1 maint: ref=harv (link)
  • Crabb, Jim (August 1988). "Super Dog Fighter, Yokomo YZ-870C" (PDF). Radio Race Car. Retrieved 22 June 2020.CS1 maint: ref=harv (link)
  • Kyes, Gary (May 1987). "RPS Yokomo SE" (PDF). R/C Model Cars. Retrieved 22 June 2020.CS1 maint: ref=harv (link)
  • Denevi, Bernard (February 1986). "Preparation Graupner Dogfighter". Auto8. Retrieved 22 June 2020.CS1 maint: ref=harv (link)
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