• 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 http://tw.myblog.yahoo.com/bs86007/article?mid=61
    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 ( http://www.pargustore.com ) or through ebay
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  • en 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 lot is this pulley bag. i used to have ZB-40 for rigid belt drive before. this ZB-40N is for the 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 while the FM antennas are getting disappear on the track.


    and Delta diff outdrives will be added soon. I’m after Delta slipper clutch as well.
    [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. you might find some aluminum parts you need


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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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  • wheels and tires for YZ-834B and 870C

  • already posted this in Korean(한글) on my another blog which I’m building over the last couple of days. and I’m doing this again. I noticed I forgot to put Custom Works wheels in this picture. but I still like this yellow, white, and pinky picture


    the original 1.75″ wheels are yellow and very cool. but they don’t showed up anymore on ebay. 870C wheels are 2.0″ and can be replaced with.
    and, there are few ebay sellers and online hobby shops sell 2.0″ tires

    Losi Rear 2.0 Step-Pin, Silver (2) LOSA7378S


    Tamiya #53059 Wide Stud Spike Tires

    Tamiya wide stud tires work with  870C front and rear wheels both. so it’s not a problem if you only have the front or rear

    870C wheels are deep dish. and the offset is identical to the original yellow wheels

    Front narrow ZC-800
    Front wide ZC-801
    Rear ZC-805


    Yokomo TR-8 was stock rear tires for 870C

    Front TF-8 (S, M, H compound)
    Rear TR-8


    with ZC-800 for front and rear both. and, tamiya wide stud tires


    834B still runs great with 2.2″ wheels and modern tires. rc10talk forum member kustomizerz made this video
    and his chassis are here

    there were a few kind of 2.15″ wheels. ZC-821 front, ZC-822 9mm deep dish front, ZC-825 deep dish rear, ZC-827 with (almost) flat dish
    ebay is the best source for the wheels. 2.15″ ROAR wheels work with modern tires as well.


    2.2″ 30 series wheels ZC-83x

    maybe you can find ZC-837 or ZC-837W 30 series wheels. but they don’t have negative offset. you need to modify the rear wheel hubs if you want to use ZC-827 or ZC-837 wheels
    2.2″ (30 series) Wheels

    Front ZC-831
    Rear ZC-835 (deep dish)
    ROAR size wheels ZC-82x

    2.15″ (ROAR) wheels

    Front ZC-821
    Rear ZC-825 (deep dish)
    ZC-822 2.15″ 9mm deep front wheels (center)
    it’s perfect for 834B and 870C but really hard to find
    with 2.2″ wheels
    Proline Champion tires were great for RC10 and 834B both. and Losi put the tires in their RPS SE kit with Team Losi Racing logo
    a frankenstein with tamiya arm. during leftover build
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  • YZ-834B wheel hub mod

  • #1 front wheel hubs
    there are 2 reasons to write on the wheel hubs. the 1st one is they are hard to find. and the other one is for the case you want to run your Wonder Doggie with modern tires. we still have the problem with getting 2.2″ wheels. but let’s get started this topic with ignoring the wheel issue

    she, the shop owner still has tons of 834B parts. but I didn’t see the left side of the front oneway wheel hubs for years

    so, I bought 2 right ones. and tried to pull the oneway bearing out. then put it back. it was quite easy to do with a hammer and 2 thick books. I got a complete pair now


    The original yellow and 870C wheels had deep offset. but later 2.2″ wheels don’t. I tried to exchanged the right and left wheel hubs. and it worked. but wanted better solution to hold the wheels securely

    the wheel hubs for RC10 and kyosho seemed to be worked.
    but, I didn’t try kyosho’s.

    got this after the step bit job with RC10 wheel hub. I didn’t cut the back end. and didn’t have to. it has gone

    it fits like it was made for this






    and after












    #2 rear wheel hubs
    it’s more simple than the front. the hub was from 870C front

    now my 834B got right thread and look
    and you can see the steering from later Yokomo cars. they are basically same. but work better and easier to find

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  • YZ-834B axles and dogbones

  • Yokomo YZ-834B came with few weak spots like most 80’s RC vehicles had some.I have made the list on wikipedia before. pleas check this http://en.wikipedia.org/wiki/Yokomo_YZ-834B and want to add some pics for someone who still runs this old and nice buggy

    the early alxes had problem with strength. and that made the axles like the right one in he picture. you can improve the strength by DIY heat treament. use your gas stove then watch it until it turns to red. and put it in the water quickly. it worked like the left one
    from left to right – hotdog4 rear axles, rear bones from AYK,
    and front dog bones


    hotdog4’s rear axle could be a good replacement. I’v been using them for years. and I noticed they won’t ever be broken or crushed

    the dogbones were from AYK Race Prep. it’s hard to find now. but it worths to get and run with them

    the length of RC10 and 834B front dog bones are identical. but the diameter of the pins are not. you may use RC10’s if you can’t find the orginal or AYK’s. but you need to trim the pins. maybe the heads as well

    Yz-834b stock front axles


    hardened front axles came with later 834B’s and RPS SE

    stock front axles were not strong neither. it had poor resistance to abrasion. the oneway bearing made worn it out like the alxes in the picture

    Later Wonder Dog and RPS SE came with stronger hardwares include this axle
    I pulled this off my runner which has been racing  for years. it still looks like new

    RPS SE C-2 bag picture from ebay
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