HONDA 125 Sammy Miller Hiboy trial test

© By Justyn Sr and Justyn Jr, 

TL125 HIBOY Sammy Miller

Here is short story of Sammy Miller Honda 125 Hiboy thanks to friends and collaborators of this website Norek family, father and son. Thanks friends!! Joan (The Honda Trials History)

Story of Honda 125 Trials bike starts around 1974, when Honda following marketing
analise decided to enter into Trials sport with their bike. At that time trials sport
was dominated by two strokes after famous Bultaco-Miller REVOLUTION that killed
hudge, heavy and old big capacity four strokes in 1965 year.
So now market was dominated by Spanish and Japanese two strokes.


Problem was that Honda filosophy was that they for various reasons were building
FOUR STROKES BIKES AND SO WANTED TO DO IN TRIALS !
So there arised question, who from top trials riders could help them in development
as Mick Andrews was working with Yamaha, Gordon Farley with Suzuki and Don Smith with Kawasaki, while Sammy Miller was tied by contract with Bultaco…
But who could do better job that man who has killed four strokes, that Miller himself ?
Thus they proposed contract to Miller, and Sammy was so attracted by this challenge,
that afer few month of tension has obtained release from Mr Bulto.
In this way another revolution in trials started culminating with 3 World Trials Championship titles and this being one of most interesting periods in Trials Sport !
First task when Miller joined Honda was to improve their TL 125 bike ready for US
market while developing real trials weapon TL 250.


TL 125 was selling success, great fun and good clubman mount despite its limitations
of engine size and weight too high, so these were areas of possible great improvement.
Sammy had its own company selling accessories and various component for trials
bikes so he decided to propose special frame called HIBOY becouse of increased
ground clearence and done beautifully by British craftsmans, with bronze weldings
of famous Reynolds 531 tubes saving weight of 11 kg when compared with standard
production frame ! In addition this frame kit offered perfect geometry and weight
Balance, fruit of Sammy Millers life long trials experience !


Now here is entering story of my bike. I was invited by my fathers good friend
Stefano Bianchi, dedicated collector of important trials bikes, to visit his home
close to Milan and shoot photos and have test ride of his works ex-Michauld
Fantic 303. We were more than happy to do that as this as we are always keen to
try and test different bikes not only trials but also enduro and motocross and shoot
photos expressing beauty of those machines.
After photo session we had great lunch with some nice local wines and Stefano has
asked us if we want to see «some» bikes from his collection. We keenly accepted and
I will not write you what we have seen, as we would fill up whole magazine, but
just our eyes spotted Hiboy Honda and also Hiboy Bultaco ! Those were bikes we
Always wanted to have, so guess with what we loaded our Renault Espace….
Yes this Honda Hiboy and Bultaco Hiboy with frame slightly cracked, so we will
repair frame and put it to another test.

Justyn Norek Jr.


In the meantime please enjoy our SAMMY MILLER HIBOY HONDA TL 125 test.
Thank you Stefano, and thank you Sammy for such GREAT SMALL BIKE !

Justyn Sr & Justyn Jr,

Honda  TL125 HIBOY Riding Impressions

Here are riding impressions of Honda TL125 HIBOY Sammy Miller,
To test this bike we have choosen Rubiana Trials Park close to Turin,
with endless number of natural and man made trials hazards. One can ride for
hours in woods and over stones without getting bored. It’s training ground for
best trials riders of Piedmont Region. It was sunday, quite few guys training there
on modern bikes, and I must say when I downloaded my Honda from trailer it has
created general interest not only among parents but also teenagers and youngtrials riders, much to my satisfaction and obvious satisfaction of my daddy.
Soon I dressed in trials trim (modern), and gave bike starting kick, as tires pressure,
petrol, oil etc were already cheqed earlier at home. She responded eagerly as any
true Honda for first kick with nice low frequency noise.
Now it’s time to ride around slowly and  adjust riding position, mainly control levers
and handlebar. Engine already warm, I started to make uphil and downhill runs trying
to get feeling of handling and brakes.


Of course being accustomed to modern disc brakes I found them not very impressive,
while in contraty handling was excellent ! It must be another trick by Maestro SAMMY
and his knowledge to design trials frames ! Bike was very stable, easy to control and
easy to manouvre. Also in turns was razor sharp and precise. Much credit must go
Also  to good suspension as well as to geometry of frame with it’s short wheelbase 
and well positioned center of gravity makes bike so easy and pleasant to ride…
So far so good, but how it will perform on rocks and stones ? Oh here are some that
I know from rides on other bikes. First attempts are not so successful as my feeling
Is lack of power…oh, I forgot it’s 125 !


Indeed with another cylinder addad on this would be almost ideal bike…I need a 250 !
I looked at web, seems biggest conversion of new cylinder is around 200…that should
Be great improvement, so this is next step I am thinking about.
In any case after some attempts I menaged to clean some considerable rocks and
steps. Lifting front wheel for aerial manouvers was as easy as on bicycle and bike performed well also on slippery ground and on roots in forest.
If I only could get more HP….I will ride it in serious competition.
It’s an ideal bike for young riders, that can grow with bike as it’s engine can be
increased to 150, 170, and eventually 200, making it very competitive, could be
Kind of modern Triumph CUB !
Great Maestro SAMMY has done it again.

Sammy Miller in a Japan Magazin TL125 Ivatoho Advert


I would like to recomend it to ANY TRIALS ENTHOUSIAST,
An ultimate FUNtastic FUN bike. I am so happy we have bought this bike….
And it’s also BEAUTIFUL !

Experienced by Justyn Norek Jnr.

Sammy Miller Hiboy HONDA TL 125 Technical Specification

Honda TL125 Hiboy Reynolds chrome plated tubular frame from Sammy Miller:
Years of production: 1973-1982,
Engine: Fourstroke ,OHC 2valve, air cooled,
Capacity: 123cc, / 7.57 cub.in,
BoreXstroke: 56.0×49.5 mm,
Compression ratio: 8.0 : 1 ,
Carburetter: Mikuni VN 24 SH,
Ignition: Flyweheel magneto,
Max. Power: 9.3 hp/6.6 kw @ 8000rpm,
Max. Torque: 9 kgf-m @ 4500rpm,
Clutch: wet, multi disc,
Gear box: 5 speed, constant mesh,
Final drive: chain,
Frame: Hiboy, Miller design, steel Reynolds 531, 11kg less than standard production frame,
Front suspension: oil damped telescopic forks,
Rear suspension: swinging arm, oil shocks, 5-way preload adjustable,
Front tyre: 2.75 – 21″,
Rear tyre: 4.10 – 18″,
Fuel tank capacity: 4.5 litres,

The RS Yamamoto

Yamamoto RS250 TW at Motegi Museum, Japan.

The RS250TW from 1985 was based on the 1982 RS250T, painted Red, White and Blue colors, HRC engine TLR front forks and some improvements like oil cooler link. The RS250TW was also called Yamamoto because he was the rider of this official bike.

Yamamoto Masaya was the winner of Japan Trial Championship from 1982 to 1986!!

The three best Yamamoto Replicas

Nowadays some nice and good Yamamoto’s replica have been made. but one of the best I see is the Jean Pierre Pregardien from France, Justin Gaugh from Australia and Gabriele Milan replicas.

Following below, the amazing work done by my friend Gabriele Milan from Italy. A super collector and Honda trials fan. Thanks Gabriele to share these nice pictures.

Gabriele Milan Yamamoto replica

Next pictures below, the great job done by Jean Pierre Pregardien.

Jean Pierre Pregardien Yamamoto replica

Below the third replica made by Justin Gough from Australia. Absolutely great!!

Justin Gough Yamamoto replica

If you have any Yamamoto bike related information, please send to hondatrialshistory@onlytrial.com

The Bill Head BH-185

Chris Mulhall, a friend of this website, built 20 or 30 years ago a Fraser Honda. He bought the frame kit in Birmingham from an advert in the Trials and Motocross Newspaper.

The frame kit was probably for an XL185. Chris built it with a TL125 engine with a Sammy Miller 150 kit and XL185 forks. The petrol was in the top frame tube like some of the bikes on your page but the large diameter tube is shorter, only the length of the hump in the seat and tank cover.

«Although it is branded as a Bill Head BH185 I was told it was a Fraser frame kit when I bought it. «

«I came across your website while trying to research a Fraser Honda trials bike that I built some years ago and sold. It is a great website that I visit regularly «

Bill Head was an off road Honda dealership in Birmingham. After Chris sold the bike he lost track of it and he never seen it again. If somebody know something about, please contact me. Chris and me will thank you any information.

Thanks to Chris Mulhall

Marina’s TL

Marina designed her own TL125. She used the Honda light silver, inspired from vintage trials and trail Honda like Elsinore was.


The Reono’s TLM 260

Thanks to friend of this site Reio Ono «Reono» to share me these nice pictures from his latest project. This time a nice TLM restoration with a very special retro feeling from the seventies Honda Trials reinforced with the use of the sixties Honda wing logo. Congratulations Reono!! I love this job.

The Hiroshi Kondo bike

Thanks to Hiroshi Kondo to send me this nice picture

Hiroshi Kondo was the winner of the Japan Trial Championship at 1974 with Yamaha TY250 and 1977, 1978 and 1979 winner with Honda.

Kondo also rode at SSDT in 1976. Hiroshi rode at SSDT with a special Honda RS250T in 1984 inscribed with the number 154. Below you can see more info and pictures.

Hiroshi made some prototypes before the final Honda RS250T special,  following and again thanks to Mr. Hiroshi, you can see the pictures of the first what he made, below these following 3 pictures you can see the numbered 154 prototype.

If you want to see extended information, you can also go to the «From 80 to 85 Honda Bikes» chapter of this site.

Merry Christmas!!

Merry Christmas!! Enjoy your bikes friends! and stay tunned to my news.

This next year 2019 I have a great surprise for all of you!

Stay tunned…

Trial Costa Brava


Trial Costa Brava is one of the nicest and popular Classic Trials in Europe. Last 2018 edition exceed the 400 participants and is known for its impeccable organization. Located in a privileged natural area, bordering the Mediterranean Sea, it is undoubtedly the most spectacular classic Trial. You can not lose this.
Congratulations to the entire organization and especially to my friend Joan Comas, along with the entire team, one of the magicians of this trial.

Joan and Patrick at Costa Brava

RTLR Club Europe President Patrick and The Honda Trials History founder Joan, at Costa Brava 2015 Trial.

Funny picture thanks to Isa.

Patrick at Costa Brava 2015 Trial. Very nice and one of the best European Classic trials.

Thanks again to Isa for the nice picture.

Joan also at Costa Brava trial, in one of the most amazing sections.