• Yokomo YZ-834B Wonder Dog Fighter

  • Yokomo YZ-834B Wonder Dog Fighter


    YZ-834B SE Limited Edition

    Yokomo made this nice chain drive 4WD buggy at 1983 when Hirobo made 44B which was belt driven. YZ-834B was the 1st IFMAR winner at 1985. and we know who was the driver.

    the 1st version came with flexable Kydex chassis and rear mono shock. also with front mono shock as you can see.


    later chassis has a small bumper and batter chassis for race. but the material is still same. Kydex


    RPS SE’s fiberglass chassis is very hard and tweak-proof. RPS SE came with lots of improved parts like shocks, gears, axles, and nice tires.

    Delta and Trinity made the chassis as well. and this Trinity is still the best one to me.


    Wikipedia link
    The manual is here
    pics of original ’83 Wonder Dog Fighter
    a few more pics from my Korean (한글) blog




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  • Yokomo YZ-834B wheels from pargu

  • my favorite wheels for 834B are Hot Laps Super Aero wheels since when the wheels came at ’86 or ’87 i remember.
    and pargu made these aluminum wheels after the original and custom works wheels. you can buy the wheels from his store ( ) or through ebay
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  • 834b shelfer part II

  • I grabbed this part lot off ebay. only what I need are the pulley bag. but the rest of them could be spare or could be a start for a new project.

    the most important parts in this part lot is this pulley bag. i used to have ZB-40 for early pulley bag for rigid belt drive. and this ZB-40N is for torque limiter setup.

    NIB parts are getting hard to find everyday. I need more arms, c hubs, and steering knuckles always

    new chain, very rare front oneway axles, rear dogbones, and steering linkage

    put my favorite Yokomo decal on the wing. and i need to cut 1/2 inch on the front side of this wing. thanks to my friends for the parts and help again


    and more pics for electronics. Novak 4 middle of restoring and my clean NER-3FM. i’ve been running with this receiver for years.


    and Delta diff outdrives will be added soon
    [Update – 6th April 2013]
    Delta outdrives have been installed along with Delta thrust bearing few weeks ago.




    and please check this. you’ll see some nice wheels for 834B soon


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  • another 834B proejct.. again

  • I’v been keeping the important parts for my future.. and it’s the current project. I still remember the moment I saw YZ-834B at the first time. it was displayed in a show window of a shop which imported Sanyo batteries from Japan. the owner seemed to have a good taste RC cars. he picked up the 834b at Japan just because it looked cool

    ok then, I bought a pair of Delta shock few years back. I had to sell most of my RC inventory for some reason. but I knew I would start this project.

    found these AYK Race Prep dogbones and hardened front axles when I was running my 834b runners. later YZ-834B SE and RPS SE came with this hardened axle
    [EDIT] I remember the dog bones were sold under Race Prep name. but the NIB package I saw on ebay was SRM RACING.
    parts numbers are
    SRM Racing Polybones 9300 Front / 9330 Rear

    you can see this brand-new main chassis from this post

    but, I couldn’t find the chassis. I got moved into a new place a couple of years ago. I thought I put this chassis in a safe place, but it was too safe. haha!

    so, I put the new parts on my old Trinity chassis like this

    this project still have a issue with the torque limiter pulley, it’s really hard to find one. actually I’v been searched it before I left this hobby. but a good news is my friend Reggie got a pulley for solid setup. and it can be converted to torque limiter pulley. it’s not a problem. I won’t run this shelf queen.


    then finally, I found the chassis in a box 2 weeks later. I got the chassis from Jason, my aussie friend few years ago. thanks Jason

    after I moved the parts onto the chassis, I noticed I still needed the top deck, and my friend Gary sent me this nice one. Gary lives in OZ, but he found this from UK. even he looks cool!

    but this project still nees front upper arms and steering knuckles. and my 2 different friends Al and Reggie found each arm between their parts. it was the most dramatic moment of this project.

    And, here goes almost complete my 5th, maybe 6th YZ-834B Wonder Dog Fighter. it looks great with Delta shocks, Custom Works white wheels, Proline made RPS tires, non-stock but strong white steering from 870C through YZ10, and Checkpoint motor




    my favorite wheels for 834B are definitely Hot Laps.

    I have some front and rear wheels,  but there was a matched pair. it looks not that good with white rim and red disc


    another couple of days later, I managed to match the wheels. now it looks great even it doesn’t have the rear pulley. no one can’t see it’s not there though.

    Al put these Hot Trick parts in the package with the front upper arms. thank you Sir!


    more pics comming



    to be continued..

    PS. please check this store. Pargu is always a great help for my 834B projects


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  • epoxy chassis for 834B

  • my order delivered today! they are epoxy chassis with 2 different thickness for YZ-834B. the weight of 3.3mm chassis is almost identical to PRS chassis. and 2mm one is light as Trinity’s in the center. new chassis were made after Trinity’s but add 4mm on the nose for secure bumper mounting like RPS did on their chassis

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  • Hot Laps 834B front wheel hubs

  • Yokomo Hot Laps made nice wheels for 834B and RC10. and, there were a few more parts from them include the oneway wheel hubs. the header says it was made of magnesium which is lighter than aluminum

    the reason I got the hubs is the shape. the offset is identical to the originals. but Hot Laps hubs allow to adjust the offset by switching with the each side, right to left and left to right


    like this


    the offset is quite right with modern 2.2″ wheels

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  • Wonder Dog Fighter wing from #6188

  • Early Dog Fighter 834B came with a small wing which was from RC-12EX. I still have the original from AE. later Wonder Dog Fighter 834B came with a large wing. you can see the pictures here.

    Yokomo YZ-834B Wonder Dog Fighter



    I noticed the shape was pretty much close to 834B large wing while I made this

    unfortunately I noticed it after I cut the #6188 sprint wing.

    opened another #6188 today. actually the 1mm lexan sheet for the chain cover was from #6189 which had more parts like 2 wing wires, buttons, and longer wing tubes in the package

    got another 1mm thick lexan sheet from the bag. and the leftover from the chain cover build


    the wing came here only a few minutes after I opened the wing kit. the shape is not identical to the original. but close. and the width is identical


    I found this BRP wing wire kit in my parts box. and put the wire on the 834B. #5247 is for RC10. but fits 834B as well.
    more pics with Hot Laps wheels & tires
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  • lexan chain cover for YZ-834B

  • the chain cover is only for protect cables and wires from the chain. but it’s hard to find these days. I made one myself from 1mm thick lexan sheet. the first attempt was not far from the original cover except it didn’t have the rear end screw hole

    there was no issue from the test run with the new cover. but I felt that I had to add something to hold the cover securely. it looks bad as you can see. BTW, the white parts is a leftover from RPM steering for RC10

    I’m building a new 834B from new parts. so I still need a better solution for this chain cover issue. and the result came like this
    now, my backup runner looks better than ever with the lexan cover. it is great. and it is cool. and it’s a fun to watch the running chain and pulley through the transparent cover
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  • RC10 and 834B running pics

  • keep them running!







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  • YZ-834B basket case build

  • I posted this on rc10talk forum when I started to build this. it took more than a year just for collecting the parts. and I spent another year for restoring itself

    it was bought from Taiwan at 2007 maybe 2006. I noticed there were only few parts that I could use for my project. it came with broken gear box, missing or wrong dog bones, crushed and damaged axles. broken steering knuckles and more.


    I still have the picture of the parts. every single axle was crushed like this diff out drive

    I had a few parts before I got the 834B. and, had to buy more. the gears and gear boxes from australia, chassis from the states, suspensions from japan. front oneway wheel hubs from australia again. the interesting part was I got some important parts from 3 different people in australia at the same time. recently I built a RPS SE and needed a few more parts. I found them in australia again. thanks to Gary and Jason


    this picture was taken during the restore. I put early chassis and RPS roll bar on my resto. most of the parts I built with were new. and I got tons of garbage. it was like a blues song. I’ll give this story to Elmore James if I meet him in another life

    it took 2 years to the 1st run

    Novak T-1X was crazy powerful

    and got this after I spent another hundreds dollars


    YZ-834B Wonder Dog Fighter with ’83 body















    A friend made me new motor plate. the original one is too weak. even can be bent easily with bare hands. he made 20 maybe 30 pieces and still sells them on ebay. not much left now. so hurry up


    I tried a few different color on the motor plate. red is my favorite

    I wanted to try the box art aluminum arms. and he did it for me. they look great and provide better handling on the track

    and from my another build. thanks to my friend Alan for the parts


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