December 30, 2010

DIY Kydex bumper

has been looking for a white bumper after I saw this
got nothing. but I got a Kydex sheet today from my friend Aaron

December 29, 2010

Yokomo MR-4BX

MR-4BX had been produced only a couple of years. the first version came at '06 and replaced with B-Max4 which was different from previous yoke buggies at '08.

a few prototypes on the pictures from japanese magazines were not far from MX-4 YMP until 2004. they put a slipper clutch, moved the motor mount forward, put B4 rear arms and losi style steering knuckles, and so on.. through early '06
my friend who has been working with Yokomo and other japanese rc companies told me their CNC machine was never stopped for a couple of years to make new prototype parts.

December 25, 2010

tamiya tamtech buggy champ

I'm running this small version of Buggy Champ - Rough Rider for years. it's small. so cannot run on a bumpy track. but, not bad on the the rally circuit where I'm running my old RC10 and 834B runners

the first thing I did was finding better motor for this 1/16 Buggy Champ. sport-tuned motor from tamiya was the most easy to find. but it was not much better than the stock motor. they released newer sport-tuned SPT recently. and I was told it was good. anyway, I could live with the motor for years

December 24, 2010

2.2" wheels for RC10 and axle mod

I got myself this front axle mod idea from forum when I wanted to put Yokomo 2.2" wheels on my RC10 runners a couple of years ago. Associated #7222 axles are everything actually. there are not much left to do except for getting the axles if you want to use B4 or JC rulux wheels

YZ-834B prototype images

got the pictures from my RC buddy yesterday. unfortunately, I didn't get any information of the source where the pictures came from

Magazine: Model Channel
Issue: May, 1983
Title: RC Car - New Kit(s) Info

December 23, 2010

2 cents tip for searching japanese web sites

use this list for searching yahoo japan auctions and other japanese sites
and there are lots of english service like this one  

Yokomo ヨコモ
Dog Fighter ドッグ ファイタ
Prototype プロトタイプ (or プロト)
Hot laps ホットラップス
Front フロント
Rear リア
Bulkhead バルクヘッド
Universal ニバーサル
Axle(s) クスル
Tires(s) タイヤ
Wheel(s) ホイール (or ホイル)
Decal デカル (or デカール)
Body ボディ
Motor  モータ
Motor Mount モーターマウント
Works ワークス
Vintage  ヴィンテージ (or ビンテージ)
Chassis シャーシ

AYK あおやぎ
Kyosho 京商
Tamiya タミヤ

and you can use Wikipedia for this purpose
let's see an example
see Languages menu at the left bottom. you can see Japanese as well

December 22, 2010

Kyosho Cactus

this one has a unique and simple tranny. there is nothing but a set of helical gear in the gear box. one of the interesting parts is the tires. they are sealed and have the air inside like 1:1 car tire tubes.
it came from '79 or '80 according to this. but I cannot remember exactly. it was far from my interest back in the days. anyway it's beautiful

night view from where I live

somewhere in Seoul, Korea

December 21, 2010

December 20, 2010

RC10 and 834B running pics

keep them running!

Yokomo 2.2" wheels from JC Racing Products

UK company JC Racing Products ( makes 2.2" wheels for Yokomo wheel hub. and they sell them on ebay
KEIL sold the wheels with his brand name at 90's as far as I remember

I just got white and fluorescent yellow dish wheels from them. I'm not sure when I can go to the track with the wheels. winter is cold here. and the indoor circuit in my town closed forever. here are some pics

Yokomo YZ-10 runner

I went back to older '94 chassis from '95 Worlds Spec (Pavidis edition). 'cause the original chassis looked better for Lipo setup. and it is

December 19, 2010

RC10 axles and wheels

the dog bones are identical to B2 and B3 from RC10. B3 should have slightly longer one maybe. but they put same one on the kit. and B4 axle is basically same except for the length and the spacer. the bones too, of course

from left to right RC10 dogbone axle, RC10 universal, and B2/B3 universal 

RC10 chassis weight

I was wondering the weight of '94 worlds chassis and did this a couple of years ago. there were no significant differences between them. but the carbon tub chassis from Fibrelyte weighs only 132g with the bathtub shape

'94 Worlds

December 18, 2010

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

RC10 wing wire bending

stock RC10 wing wire had .062" diameter. but yokomo put .078" wires in japanese version RC10 kits. I tried both and .078" was better to me. towerhobbies sells 36" wires. you can make 3 wing wires from 1 piano wire 

the left one was from Yokomo, and the right is stock RC10 wing wire
and I can barely see the new wire in front of the ruler. it's 12" = 30.5cm

put the 1st mark on the center of 12" wing wire. and add 2 more 1" from the center

then bend it

almost done

decide the height of the wing

slightly bent the legs(?). then the wing tubes hold the wire securely

RC Car Action scans

mostly from

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

nice pink wheels from tamiya

this Zahhak is based on TRF 201 which is the knockoff of Associated B4. Tech Racing made TRF touring cars for Tamiya. and now Tamiya is copying  BJ4 and B4. what a shame on this!
you can see tamiya's own BJ4 from this

but the wheels themselves are pretty cool. even the pink buggy wheels were kinda trademark of Yokomo

I was wondering what Zahhak meant. see this if you are

December 17, 2010

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

I'm going to translate my 834B wheels topic written in Korean(한글) to english soon.

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.

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 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

December 16, 2010

Yokomo molded wing

the molded wing from Academy made after Yokomo's. but they are bit different.
most of all. their white wings are too white.

I'm updating this post after I trimmed the wing for my YZ10. it doesn't look that bad from the pictures but still too white like a movie character with whitened teeth.

the updated pictures are attached on the bottom of this post

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.