Great video . Takes me back. Mine was a 1979 pocket rocket. Top end was over 85 (over 90 down a hill with the wind behind you). Don't think I ever drove it that slow though!! In those days the 3 feet between the car in front of you and the car coming in the opposite direction was where we lived. Not the cleverest in hindsight but never felt more alive. The reckless innocence of youth :-). Thanks again for posting.
Never had a motorbike,my dad had one and saw his mate get killed and he never let me have one.A missed out opportunity in my youth.I always liked and remembered the humble fizzy.
Think it needs a tooth or two on the sprocket. Mine did a tad just under 80. Just before the red line. Got with a seized engine. So but one from a 1975 rd. only 5 speed but de restricted.
Schönes Video, guter Motorklang, danke. Aber in den langsamen Passagen z.B ab 4:05 oder ab 5:15 oder ab 10:50 besonders deutlich, da hört man deutlich diesen schwellenden Ton. Dazu die leicht zittrige Tachonadel. Kurz und gut: Der Kettensatz ist völlig verschlissen, die Kette unterschiedlich gelängt. Exakt dann entsteht dieser jullerige, in der Frequnez leicht schwankende Motorton. Okay, sieben Jahre später wird das wohl erledigt sein.
I had one of these in 1982, just before the law changed for learners, limiting them to 125 and a restricted horsepower. I was around 20 years old and weighed next to nothing so the bike flew - 80mph was no problem, and 90 could be had down hill, chinning the tank :) - It would be interesting to see in hindsight if all those changes to the 125's and 50cc restrictions actually reduced the number of accidents as it claimed it would?
Doesn't quite have the original performance due to now running on lower energy E5 unleaded petrol (8.3 million calories per litre), compared to the higher energy leaded petrol (9.2 million calories per litre).
To be fair I think it was out of turn, plus I believe at the time, it was running its original pistons from factory, 41 years ago now . I have only just recently had it rebored with new pistons. Still running in. Yeah I wonder if it ran any better with the period fuel types. Cheers for commenting.
@@anthonycate4524 Good luck running is as I had to run in a 1970's 250cc 2 stroke, with totally rebuilt engine, in a bike I'd built for someone last summer, as he'd never ridden a 2 stroke before and was concerned that he'd f**k it up somehow. The first 100 miles out of the 500 miles were tedious agony to endure. When I handed it over it had 500 miles added to the clock. I've noticed, along with my mates, that since petrol became contaminated with 5% ethanol the engines tend to lose low down & midrange power, once warmed up, compared to what they used to go like on pure uncontaminated unleaded. I've found this to be the case on all my 2 strokes and my son's 2 strokes well. On the Castrol website there was an explanation of what was happening, as it also affects all carbed engines when running on E5 unleaded. Their scientific explanation was that unleaded boils at 35 degrees C. in normal atmosphere (1 Bar / 14 PSI) but adding 5% ethanol drops the boiling point to 18 degrees C which means that when the engine is hot, the petrol boils upon entering the cylinder at BDC instead of when near TDC leading to poor combustion, loss of power, sooty black plugs and excessive exhaust smoke (on 2 strokes). Castrol recommends adding a shot of kerosene or diesel as both of these will raise the boiling point of petrol. I've been adding 40:1 diesel into the petrol for 3 years now and no more sooty black plugs, clean cylinder heads, a return of low & midrange power and no more clouds of smoke when hustling my 2 stroke bikes along.
@@CZ350tuner that sounds right, I have been trying to use the Gunson colour tune with the standard jetting of #40 pilot and #84 main. Using the kit, you trying to achieve the bunson blue flame, using the carbs air screw. But no matter what I tried, it stayed yellow. What I was going to try next was some leaner pilot jets, I have #32.5, #35, and #37.5. But it could just be the new E5 fuel not burning clean in combustion. I'll have ago. Cheers.
@@anthonycate4524 The thing is that modern ECU fuel injected engines can compensate for poor combustion caused by ethanol contamination, carbed engines are fixed. Like you I wasted a lot of time cleaning & rejetting carbs, changing plugs temperature ratings and brands (even expensive Lodge Sintox plugs), decoking the engine & exhaust system, checking the ignition system, etc. to no avail. When the problem extended across all my 2 stroke bikes plus my son's there has to be a common factor involved. In the end I googled the problem and found the Castrol website piece on the problem. Problem solved with the remedy. If you want ethanol & acetic acid (ethanol + oxygen = acetic acid) proof fuel hoses check out Jawashop.com as they sell the stuff. UK bike dealerships are stuck with vast stocks of old rubber & neoprene hose (which isn't ethanol & acetic acid proof) but will reassure you that it is just to shift the now obstelete useless stock, making their problem into your problem as the hosing breaks up, flakes internally and starts to block the carb with particles & tar like goo. This was a long standing parallel problem concurrent with the loss of power through poor combustion 3 years ago. Try a shot of diesel with the petrol and use the Gunston colour tune to see if it changes things. I'd start at 50:1 and then up the diesel shot ratio gradually and see what happens. My 33:1 & 40:1 Diesel ratio is based on what I've been using on 9.8:1 and 11:1 compression ratio 2 stroke single & twin bike engines, so probably won't be right for your bike's 7:1 compression ration engine, so you'll have to find your own optimum. In 40 years of building, tuning & riding 2 strokes I never though that I'd end up having to sort out a bad chemical engineering problem in the actual petrol!!
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Great video . Takes me back. Mine was a 1979 pocket rocket. Top end was over 85 (over 90 down a hill with the wind behind you). Don't think I ever drove it that slow though!! In those days the 3 feet between the car in front of you and the car coming in the opposite direction was where we lived. Not the cleverest in hindsight but never felt more alive. The reckless innocence of youth :-). Thanks again for posting.
I have same year of bike 1979, but never gone above 80 (as seen in vid). Did you mod yours or was it stock? Cheers for your comment.
Never had a motorbike,my dad had one and saw his mate get killed and he never let me have one.A missed out opportunity in my youth.I always liked and remembered the humble fizzy.
Had a 1974 one new ,,,,,,,,thanks for my virtual drive ,,,,,,,, they were light-weight but nippy little beasts !!! Thanks for the trip !!
Did you not get into fifth gear
Think it needs a tooth or two on the sprocket. Mine did a tad just under 80. Just before the red line. Got with a seized engine. So but one from a 1975 rd. only 5 speed but de restricted.
Excellente ❤ vidéo
mate had rd 125 lc 83 plate 21bhp with micron exhaust that guy was the fucking king
Brotton, it's the best destination!
Brilliant ant 👍
I have a 125dx
Schönes Video, guter Motorklang, danke. Aber in den langsamen Passagen z.B ab 4:05 oder ab 5:15 oder ab 10:50 besonders deutlich, da hört man deutlich diesen schwellenden Ton. Dazu die leicht zittrige Tachonadel. Kurz und gut: Der Kettensatz ist völlig verschlissen, die Kette unterschiedlich gelängt. Exakt dann entsteht dieser jullerige, in der Frequnez leicht schwankende Motorton. Okay, sieben Jahre später wird das wohl erledigt sein.
I had one of these in 1982, just before the law changed for learners, limiting them to 125 and a restricted horsepower. I was around 20 years old and weighed next to nothing so the bike flew - 80mph was no problem, and 90 could be had down hill, chinning the tank :) - It would be interesting to see in hindsight if all those changes to the 125's and 50cc restrictions actually reduced the number of accidents as it claimed it would?
Never got to 90mph, 80mph down hill I have done. Maybe I need to change spocket sizes.
@@anthonycate4524 You need a good porting job and tuned pipes.
I remember having one that was tuned and I got 115 mph and it used to redline at 14000 , oh yeh and also blow up quite a lot lol .
Doesn't quite have the original performance due to now running on lower energy E5 unleaded petrol (8.3 million calories per litre), compared to the higher energy leaded petrol (9.2 million calories per litre).
To be fair I think it was out of turn, plus I believe at the time, it was running its original pistons from factory, 41 years ago now . I have only just recently had it rebored with new pistons. Still running in. Yeah I wonder if it ran any better with the period fuel types. Cheers for commenting.
@@anthonycate4524 Good luck running is as I had to run in a 1970's 250cc 2 stroke, with totally rebuilt engine, in a bike I'd built for someone last summer, as he'd never ridden a 2 stroke before and was concerned that he'd f**k it up somehow. The first 100 miles out of the 500 miles were tedious agony to endure. When I handed it over it had 500 miles added to the clock.
I've noticed, along with my mates, that since petrol became contaminated with 5% ethanol the engines tend to lose low down & midrange power, once warmed up, compared to what they used to go like on pure uncontaminated unleaded. I've found this to be the case on all my 2 strokes and my son's 2 strokes well.
On the Castrol website there was an explanation of what was happening, as it also affects all carbed engines when running on E5 unleaded. Their scientific explanation was that unleaded boils at 35 degrees C. in normal atmosphere (1 Bar / 14 PSI) but adding 5% ethanol drops the boiling point to 18 degrees C which means that when the engine is hot, the petrol boils upon entering the cylinder at BDC instead of when near TDC leading to poor combustion, loss of power, sooty black plugs and excessive exhaust smoke (on 2 strokes).
Castrol recommends adding a shot of kerosene or diesel as both of these will raise the boiling point of petrol. I've been adding 40:1 diesel into the petrol for 3 years now and no more sooty black plugs, clean cylinder heads, a return of low & midrange power and no more clouds of smoke when hustling my 2 stroke bikes along.
@@CZ350tuner that sounds right, I have been trying to use the Gunson colour tune with the standard jetting of #40 pilot and #84 main. Using the kit, you trying to achieve the bunson blue flame, using the carbs air screw. But no matter what I tried, it stayed yellow. What I was going to try next was some leaner pilot jets, I have #32.5, #35, and #37.5. But it could just be the new E5 fuel not burning clean in combustion. I'll have ago. Cheers.
@@anthonycate4524 The thing is that modern ECU fuel injected engines can compensate for poor combustion caused by ethanol contamination, carbed engines are fixed. Like you I wasted a lot of time cleaning & rejetting carbs, changing plugs temperature ratings and brands (even expensive Lodge Sintox plugs), decoking the engine & exhaust system, checking the ignition system, etc. to no avail.
When the problem extended across all my 2 stroke bikes plus my son's there has to be a common factor involved.
In the end I googled the problem and found the Castrol website piece on the problem. Problem solved with the remedy.
If you want ethanol & acetic acid (ethanol + oxygen = acetic acid) proof fuel hoses check out Jawashop.com as they sell the stuff. UK bike dealerships are stuck with vast stocks of old rubber & neoprene hose (which isn't ethanol & acetic acid proof) but will reassure you that it is just to shift the now obstelete useless stock, making their problem into your problem as the hosing breaks up, flakes internally and starts to block the carb with particles & tar like goo. This was a long standing parallel problem concurrent with the loss of power through poor combustion 3 years ago.
Try a shot of diesel with the petrol and use the Gunston colour tune to see if it changes things. I'd start at 50:1 and then up the diesel shot ratio gradually and see what happens. My 33:1 & 40:1 Diesel ratio is based on what I've been using on 9.8:1 and 11:1 compression ratio 2 stroke single & twin bike engines, so probably won't be right for your bike's 7:1 compression ration engine, so you'll have to find your own optimum.
In 40 years of building, tuning & riding 2 strokes I never though that I'd end up having to sort out a bad chemical engineering problem in the actual petrol!!
@@CZ350tuner cool, thank you for the advice, I'll do some experimenting on the Rd. I will tell you how it goes. Cheers.
well that yammer could get on your nerves in about 5 minutes.
Thats not how to ride 2 strokes :/
AGA AGA can you tell me how to ride a 2 stroke correctly then?
My rd 125 dX would do 85/90 but now im not sure I was ridding it properly perhaps it should of been slower "AGA AGA