• en ’88 YZ10 (870C) and Hotdog4 update

  • Yokomo 870C aka.1988 YZ10 build with

    White winter arms
    2mm fine pitch drive train
    Yokomo Hotlaps wheels
    Lightened diff cups
    Composite Craft shock towers
    Front aluminum bulkhead
    AE steel turnbuckles from RC10 Worlds re-release kit
    SRS steering blocks



    Hotdog4 built with
    AE 870C shock towers
    MX4 rear aluminum CVD bones
    Academy molded wing
    Extended wheelbase with longer rear belt
    White Kydex bumper, homemade
    870C shocks with later shock ends for Works arms
    AE steel turnbuckles from RC10 Worlds re-release
    Magnesium bulkheads


    Hodog4 has the copper springs now


    And, few more pics with C4 body



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  • en Yokomo CVD bones

  • This post would be a help. but it seems impossible to get them unless you guys push MIP to make them again.

    Yokomo YZ10, Works, and 870C universal drives info

    it’s the basic info for Yokomo CVD bones
    ’94 YZ10 front CVD bone 84mm
    ’94 YZ10 rear CVD bone 79mm
    MX4 rear CVD bone 79mm

    Kysho RB5/RB6 70mm CVD bones work for 870C F/R

    MX4 rear bone works with ’94 YZ10 rear. and, Works F/R
    ’94 YZ10 rear bone works with Works F/R. and, for 870C front wide setup
    Bj4 front bone doesn’t work for Yokomo diff cups

    ’94 YZ10 front


    from the top, MX4 Rear / ’94 YZ10 Rear / Jconcpets BJ4 front.

    the length are identical to each other. but the head pins are not. I’ve tried more CVD bones from AE and Losi. and all the US brand CVD bones have bigger head pins which don’t fit Yokomo diff cups

    While the length is identical, Bj4 CVD bone don’t work for Yokomo diff cups


    ’94 yz10 cvd bones go deep inside of the diff


    MX4 bones have longer head pins. it’s fine except for 870C



    870C front wide setup with ’94 YZ10 CVD
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  • en Yokomo Hotdog4 build from YR4 kit

  • I started this build on my personal blogspot blog. then I moved whole the articles on slowbean. I might want to arrange them into one single thread later.

    it’s my yokomo Hotdog4 built from YR4 kit with some Works bits, along with Yokomo Esprit stock motor. I’m working on the new shock towers. 


    MX4 rear CVD bones fits perfect for ’91 through ’93 Works. Hotdog4 has the same arms. and you guys can see the result. the length is same with post ’94 yz10 rear cvd bones.


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  • 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 870C shock tips

  • [Updated]
    Do not use the small black O-rings in the kit.
    use metric O-rings which is hard type. not the soft ones like in AE shocks. the orange ones from later Yokomo shocks worked well.

    Put black large cap seals. Yokomo ones are not helpful. AE shock cap O-rings works fine

    Do not put the shock end till you finish the shock. you can adjust the rebound without the shock end


    [Original Post]
    The purple shocks look great and leak bad. and there are two different way to build these shocks.

    The old way is with springs inside. and another method is with a thin washer instead of the spring. both hold the plastic bushing tight and prevent the leak. but the washer is more simple and works better to me. another problem with the spring method is the stroke keeps getting smaller while the oil leaks

    It’s easy to exchange the spring to the washer. the later kit came with 10mm thin copper washer, and any thin washer with 9~10mm diameter works. but the inside hole should be 4mm or more. this margin makes the piston and the red large seal doing their jobs. and, don’t forget AE green slime

    Sometimes we got broken shock shafts or alumium shock ends. or I want to use this non-leaking purple shock on my Hogdog4. later yokomo shock shafts are 3mm thick and they are too thin to be replaced. AE shock shafts work well with 870C shocks.

    For this, you need to use the washer, not the spring. otherwise the shocks leak

    With Composite Craft graphite shock towers and today’s work

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  • en Yokomo 870C build from the parts









    front wide setup with Works CVD, SRS steering knuckle.


    #yokomo #yz10 #cvd #870c


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  • Yokomo YZ10 kingpins

  • The kingpins from 870C through YZ10 are basically same shoulder screws. even you can find the replacements from Tamiya and Kyosho as well. and MX4 kingpins are flanged bushing (flanged sleeve) which are easy to assemble and hard to be lost


    The flanged sleeves should be assembled from inside to out on the front C hubs.


    But, YZ10 C hub has a bit small room for MX4 kingpins. and both assembled from top to bottom. like these pics


    All done with titanium screws, and ready to run.

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  • Yokomo ZC-107C special wing mount

  • Found some for myself and friends recently. I had a few while ago. but haven’t seen them for a while





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  • Yokomo ZD-304S machined motor mount

  • There were 2 different ZD-304S from Yokomo. the early one is more simple, and later one came with idler bearings

    the first one is here. it’s very unique with 4 of 4-40 SAE flathead screws on the bottom. they are the same screws you can find from AE cars. and I’m not sure with the later version. I haven’t opened the bag yet



    And, this is the later one.

    Someone posted some decent pictures of the 2nd version on Tamiya club.

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  • setup tool for Yokomo 5mm axle

  • Hudy seems to make the best setup tools on the market. but we never had one for Yokomo YZ10 5mm axle yet. or simply I didn’t see

    I got this 1/8 on-road setup tool for 12mm axles. and only thing I need was 4 of 5x12mm bearings. I ordered the bearings. then forgot about it. some metric and SAE bearings came from Avid RC for my Yokomo and AE buggies. but couldn’t remember why I got 5x12mm bearings with them. it took a while to figure it out.

    The setup tool is this. Hudy 1/8 on-road setup tool for 12mm axle. and I just switched the front and the rear ones.

    Putting the bearings is everything for this job. couldn’t find flanged ones with the same size. and this standard bearing works fine of course

    Then 1/2″ step bit job on the other side for 3/16″ axles.

    Then some thin paper tape to hold the bearings securely


    The tool works for the old 834B through YZ10, RC10, and modern 4WD as well.

    On the rear axles, 5x12mm bearings works fine for 5mm and 3/16″ both. the difference is small. and we just need the camber angles on the rear axles.

    Also, this tool is a very nice display stand for YZ10

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  • Yokomo aluminum bulkheads

  • There are two different versions
    ZC-300AF Aluminum front bulkhead
    ZC-300FC Aluminum front bulkhead for Works ’93

    those two are basically same, except for the caster angle.
    ZC-300FC for Works ’93 has bigger angle as you can see from the last picture
    if the caster is same with the magnesium bulkhead, it’s 300AF. you can see that without the header.








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  • Yokomo YZ10, Works, and 870C universal drives info

  • Probably, I posted this somewhere. and I’m doing this again to remind my memory.

    it’s the simple comparison

    ’94 / ’95 / ’97 YZ10 front > ’94~’97 YZ10 rear = Works ’91 / ’92 / ’93 Front = Works Rear = 870C front long version (with outer mount hole on the front arms) > 870C Front = 870C Rear

    so, there are only 3 different lengths from Yokomo from ’87 through ’97.
    but, there are more than one model number for the same length. it’s about the solidity.

    870C universal drive, ZC-421 (front long version ZC-422) are softer than ZC-422A which is Works F/R universal drive. but ZC-422 and ZC-422A still have the same length.

    there are ZC-423, ZC-423S, and ZD-423. all they are for ’94~’97 YZ10 front and the differences are solidity as well. it’s just about the material

    Yokomo keeps testing and making new parts for their current and next models. it’s the reason they keep changing the model numbers and making newer ones. I respect that

    From left to right,
    ZD-423 = post ’94 YZ10 front, super hard version (same length with ZC-423, ZC423S)
    ZD-422 = post ’94 YZ10 rear, super hard version (same with ZC-422A which is for Works)
    ZC-422 = 870C front long version (same with ZD-422, and ZC-422A)
    ZC-421 = 870C F/R

    the actual length from the end to the other end is
    107mm, 101mm, and 96mm
    the length from the end to the universal joint is 25mm


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  • en ’94 YZ10 a bit psychedelic

  • my ’94 yz10 runner got a new shell with some decals today.

    now it runs with
    HD universal drives
    Yokomo Aluminum motor mount
    Team Suzuki F/R hubs and hub carriers
    ’93 WCS steering





    [update from July 2nd, 2015]

    found the MX4 wheel hubs for YZ10. and more MX4 wheels for this setup too.

    pargu is working on the wheel hubs. you guys can use them pretty soon.





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  • Yokomo YZ10 ’93 WCS Runner project – Part I

  • these 2 threads from rc10talk.com got lots of pics and information. i started this project from those as well
    also this thread got lots of detailed pics

    my goal is building a ’93 WCS YZ10 replica with newer electronics and tiers for vintage race. i still need to get some correct parts for a replica. and, now i can run this before i get them. it’s a runner before a replica

























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  • imex and Yokomo Hotlaps wheels trick

  • I saw some 2.0″ imex disc wheels on ebay a while ago. the plain disc design was far from yoke Hotlaps aero wheels. but the structure itself looked pretty much same to me. it was 3 years ago

    then a close friend found me some imex wheels recently. so, i could build more 834B wheels from Hotlaps 2WD front wheels plus imex wheels today. it worked!

    thank you so much Aaron!








    and the leftovers..
    center discs from imex and 2.2″ 2WD front outer rims from Hotlaps

    and few more pics from my old posts






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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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  • en Yokomo ’95 YZ10 W.C.S Aka Pavidis parts list

  • I made this list from Asso_man!’s RC10talk thread a couple of years ago. and just noticed the file I uploaded has gone somwhere.

    Yokomo YZ10 W.C.S part list thread on RC10talk


    the scanned images are here

    Yokomo YZ10 Pavidis Part list #1 & #2




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  • my old MX-4

  • I bought this MX-4 at the first day it came from the factory. I remember it was April maybe May ’98. and it’s still one of my favorites. actually I was faster with Losi XX4. but mostly raced with this MX-4. and I could learn more about race and setup from this beauty. everything is still fine except for the rear tires on the front wheel.



    this trick is great for protecting the spur. the first batch came without this foam in the boxes. and they started to put this in the kits a couple of months later from the release


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