At the end of 1972, Honda launched the TL125, known in Japan as the name of BIALS.
Engine used for it was the 121,9cc (54 X 49,5mm) two valve sohc from the Honda SL125 model, lowering its compression from 9:5 to 8:1
Little Honda Tl 125 was very popular, Honda had big success in the US, Japan and Europe.
Honda seriously began on the Trials Bike competition in 1974 with one of the most important persons on the Honda Trial Bikes History: Sammy Miller. He was a key person on the Honda Team, as a rider, as a bike development and as a strategist.
The Honda TL 125 had a lot of series, for sure the most successful Honda trials.
From 1972 to 1988 little Honda TL125 had basically two series: The Japan Bials series and the US TL series:
Honda TL125 US Model Series
1973 Honda TL125 K0 (US model)
1974 Honda TL125 K1 (US model)
1975 Honda TL125 K2 (US model)
1976 Honda TL125 S (EU model)
1983 Honda TL125 DJ (EU model)
1988 Honda TL125 JD06 (EU model)
Honda BIALS 125 Japan Model Series
1972 Honda BIALS 125 K0 (Japan model)
1974 Honda BIALS 125 K1 (Japan model)
1975 Honda BIALS 125 S (Japan model)
1981 Honda IHATOVO 125 SB (Japan model)
The bike had following equipement (several modifications and improvements were added during all his live):
The engine was a Honda Single Cylinder, air cooled
Four stroke with two valves on head.
Displacement: 122cc displacement.
Bore and Stroke: 56,0 X 49,5 mm
Compression Ratio: 8.0 : 1
The maximum power was 8 hp at 8.000 rpm
Clutch: Wet, multi-plate
Ignition System: Flywheel magneto
Steel tubular frame 88 Kg weight
2.75-21 and 4.00-18 tires
Five speed, constant mesh
For more detailed TL125 information see please the link below (fantastic web page enterely dedicated to this TL125 model from Jose, France):