Forum Corner

[Calum]

@Darty Difference is, this is a fully fledged GP Bike. Aprilia RS you buy on the road. They were competitive, but obviously no match for a bike designed solely for track. Nice diagrams

[Darty]

@Calum Spend my loose change on Brochures to often,

Aprilia did run the RS125GPs or RS125R. late 1980's and 90s. A works engine and chassis from which the RS125's were developed. Not much info on them.

[Calum]

@Darty Oh I wasn't implying the rotax 122 was left stock. No doubt they had a revised version. That said today they use it in the 125 series amongst hondas rs125. Don't kmow if Yammy is still doing tzs

[Darty]

@Calum No production of the TZs since 05' I think. It's a mad one, I've been looking at imported Japanese spec RS125 engines to drop into a production frame, What a project to build!

[Calum]

@Darty I am not familiar with the NS125. What is it?

[Darty]

@Calum Yeah WTF.. Lost my way. NS125 is this 80s gem.

Basically don't listen to me, I meant the Honda RS' 125.

[Calum]

Mmmm that ns is nice. Presumably then the ns125r became nsr125 which I have heard of.

Yeah Hondas RS125 us savage.

Never sren one irl though

[Darty]

Yamaha DT200R 3ET. 1989. - Still a pogo stick. 28hp?

Lire Français?

Up to 2001. 3RMs

[Calum]

I am certain a revision of the 3et made decent power. TOWIY would know more aboht that than me tbough.

[Darty]

Yamaha TZM150.

Nicasil bore, 4HF-00 or 4AP-00 - 147cc

Looks very close to matching DT/TZR crankcases, but not quite.

TZM has the same stroke/ crankshaft as the 125s, really strange engine by Yamaha for the East Asian market. Rated at 34hp, apparently. But more like 30.

hmmm...Looks like a crap TZR. Or just like a TZR50.

And then a TZM 50, which I just found today, Thought man, that's pretty cool.

But, street legal road bike for whom? An 8year old? Lke TDR80's they are hilarious, proper bits of kit, just shrunk in the washing machine.

[Calum]

@Darty That TZM 50 is lush

[Darty]

@Calum I want one for round town

[Darty]

1988' Japanese market promotional material. Japanese aesthetic has a way of producing great graphic design. I'd like to say this is a fairly rare find even coming from Japan.

That bash plate though!? I want.

88-92' or so, the DT125R is advertised with a DT200R headlight and Alloy wheels for the JDM market.

These have to be the best illustrations I've seen out of the promo so far.

The DT200R always had a Yamaha Mikuni TM28ss, was always in the pipeline for the 125R.

I can believe that the intended output for a DT125R is 22ps, which is about 21hp.

[Calum]

@Darty Wow, you certainly don't see many of those multicolour front mudguards!!

[Darty]

Check this all, 2RH Turbo.

https://www.youtube.com/watch?v=Oxj_OAb5bqk&list=LL5qGGE0mJaCm9BMMu7reYUQ&index=1

lol.

@Calum I found a couple of those bolt on mudskirts in Japan, just need a standard DTR to bolt it too

[NINJA]

@Darty Man where do you find all this stuff? You must spend hours searching for it???

Good job though.

[Darty]

@CYBER-NINJA lol Not much, find this shit by accident mostly.

[Darty]

Bought a cool advertisement from 89'

[NINJA]

@Darty Man even nearly 30 years old, those bikes look awesome when new.

[Darty]

KTM in from the mid 80's were pretty werid and poor quality. Some of the best looking MX bikes of all time I think. And in 1985, KTM's were coming out with (White Power) WP nowadays,.. USD forks and front AND rear discs.

For the late 1980s KTM's were pretty tech, but not very good by most accounts.

Just a cool and very forward thinking piece of engineering from 1989, I thought I would share MXA's Write up, the only Magazine to get to test it, for the KTM 125MX AMP Prototype.

http://amp-research.com/wp-content/files/MXA_AMP_KTM_May2013.pdf

A really interesting time in Motocross development and the beginning of real refinement of the 2stroke for off-road racing.