were different times. The two-stroke engines will eventually disappear. Did not comply with pollution control regulations, required maintenance three times a four times with the same displacement. They were much louder and more garish than today's engines. Heran more artisans, more careful design. Making an escape for two days was a task only for more advanced physics. He had to have bellies and tight areas so that the resonance of the exhaust gases of combustion chamber emptied.
exhaust valves had tried to make the power curve a little flatter and oversized megacarburadores only worked well in high returns and were impossible to tune.
In Spain and in Europe we were making experts. I refer to the single-cylinder two-stroke sports 80 and 125 cubic centimeters. the big bikes were European, the Japanese had only a mere token presence in this category.
GPR Derbys were the 80 that razed to the Honda NSR YAMAHA TZR 75 and 80.
Here I put a Derbi GPR 75. I had one, hayyyy what memories.
in 125 if there was no color. the Cagiva freccia of 125 with seven gears, Gilera SP01 appreciating a motorcycle grand prix Aprilia 125 and other future over which I can not remember.
but if I remember the feeling of learning to ride a bike on top of these machines. The two times it was the essence of motoclismo. You had to know how to lead those rabid two-stroke engines and low displacement. That if I was riding my bike excellence, speed up 12 horses from a 80 cm3 to the limit and get all their pulling power. Exit
take a chop with friends with a 80 cm3 bike required a technique and practice that have little to do with driving a modern bike.
early 90's had a group of friends with bikes 80 and every Sunday we went up and got off the port of Lions like a circuit. San Rafael Guadrrama and backwards.
Here I leave another photo of the Honda NSR 75. the greatest enemy of the Derbi GPR.
bikes of that time went, but only in a narrow strip of counter. had two or three thousand useful where the engine revs really pushed. You had to be able to keep the tach needle in this age of revolutions throughout the ascent to the port. there was loss pasasen you in a second two or three bikes.
Back to retrieve a motor that had fallen from around required a machine gun use plan change. had to downshift all milk Release the clutch but gently blow in the right gear, open throttle downshift in that you had gotten to get back on the lap counter as an arrow into the upper echelons of the tachometer and start up gears with very cautiously until meet again at 6 to 120.
had to go very fine with the engine, but only that what you did was follow the crowd to reach the top positions were also able to use the chassis. Like all bikes went more or less the same the only way was to pass someone was out of his slipstream. During the line you had to put so very close to you had before to leverage its aerodynamic wake , This cone is generated behind you when you go on a motorcycle at high speed is less "dense" than the surrounding air and if you go into a tad win a top speed .. Yeah I got just what you were able to keep motro screaming in the red zone in the highest gear that could be used. If you put a longer aogaba and the engine fell apart, if they put a shorter revolutionize the front bumper but you took off and lost his slipstream.
Another photo of the Yamaha TZR was the umpire. Was a little less than the other two but was more and more fiable.venía bike without fairing factory but you could adapt one of the auxiliary industry and was superchula. Was the most bike of all but the engine was also less potent.
Once 
were a few inches behind sooner or later the line had reached a curve. Just before you could get out and use that extra speed would give you thrown out because you had the least air resistance and keep the engine had achieved this advantage by 100 or 200 rpm further than the front. This technique gave you the ability to get out of the slipstream and put in parallel with, but did not reach much beyond that and leave the wake of the friction force air back to equalize and the 200 rpm more fell quickly, but lasted the few seconds needed to get in line. 
But consummate the advancement required a hurried good braking.
had to restrain a split second later that you were trying to pass it forward to finish before the curva.Jugabas with that margin of safety to bikers call the limit. had to get close to the maximum without reaching sobrepasarlo.Tenías to brake like a madman with two pinion brakes, a few thousandths from behind before to lower the rear and right after the front to back, sinking front suspension thoroughly but without departing from ears or loss of adherence of front tire. The chassis are like today and twisted and Bikes jumped like possessed.
curve could only be drawn by an imaginary line exactly. had to be able to reach it with the bike in front. If all the above maneuvers had done correctly would have managed to overtake the nose and you were in position to draw. Furthermore, the forward'd just had realized all of a sudden someone came out of nowhere (because all this happened in a second) was placed in front of him and let you draw without making the beast, ie the loosened a tad trace gas behind you and not in parallel where it would be much more dangerous. But if you think
slowly now was he who was behind you at the exit of turn and it was your tow which was favorable to accelerate and execute the same maneuver that he had done in your previous line.
game was the slipstream, to bring the engines in their zone of maximum power, 80 cm3 engine and two forward tiempos.de someone else be able to get an infinitesimal over his bike, thanks to the exact circumstances each situation should be calculated in real time.
Thus a curve, and then another, and so the whole port, first rising to 80-90 km / h and then down at 120-130. Five or six times spent in port every Sunday morning.
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