I have never know that there is Yamaha bikes that have the same style like the Honda Nova Dash, Kawasaki Leo Star or the most recent, the Suzuki Belang R150. Here is the Yamaha Speed MX presented by Norifumi Abe in year 2007 (the date of the picture).
Also known as Yamaha Tiara S 120, JR120 or just Speed.
The specs are amazing. This is 2-stroker with 120cc, monoshock rear suspension, front and rear 2-piston caliper brake system and 6-speed transmission. It never gets to Malaysia though. Teribble.
I’d like to say that this bike is the smaller brother to Y125Z which is already perfect in every way possible. The design is fresh and way much better than any bike at that time.
One of my friend in Greece tells me that there are some Y125Z parts that can be used to this Speed MX. I’m thinking the crankshaft can be easily swapped to get higher stroke of 54.7mm from the Y125Z.
Technical specs of Yamaha Speed MX are after the jump
| MODEL | SPEED MX |
| ENGINE TYPE | 2 STROKE CRANKCASE REED VALVE |
| AIR-COOLED | |
| 119.0 CC. | |
| BORE AND STROKE | 54.0 X 52.0 MM. |
| COMPRESSION RATIO | 6.8:1 |
| HORSE POWER | 17.0 PS/7,500 RPM |
| TORQUE | 1.55 KPM./7,000 RPM |
| CARBURATOR | MIKUNI VM22 S.S. |
| TRANSMISSION | 6 SPEED |
| SPARK PLUG | C7HSA (NGK) |
| IGNITION | CDI. DC. |
| CLUTCH SYSTEM | AUTOMATIC DOUBLE CLUTCH |
| START SYSTEM | KICK START |
| FUEL CAPACITY | 6.5 L. |
| AUTOLUBE CAPACITY | 0.95 L. |
| DIMENSIONS | 630 X 1,864 X 968 MM. |
| WHEELBASE | 1,230 MM. |
| FLOOR HEIGHT | 139 MM. |
| SEAT HEIGHT | 765 MM. |
| DRY WEIGHT | 100 KG. |
| FRONT SUSPENSION | TELECOSPIC |
| REAR SUSPENSION | MONOSHOCK |
| FRONT BRAKE | DISC BRAKE |
| REAR BRAKE | DISC BRAKE |
| FRONT TIRE | DUNLOP TT900 2.25-17 |
| REAR TIRE | DUNLOP TT900 2.50-17 |
Source: http://www.faddybike.com/static/yamahaspeedmx.htm
