How fast is fast enough for you? ^_____^

Discussion in 'General Questions' started by bakaneko, Nov 29, 2015.

  1. bakaneko

    bakaneko Active Member

    For me, I recently switched to a 36T sprocket on my regular head (not high performance) 2-stroke 66cc engine. I am a bit under my desired speeds (24 cruise) and will look to fix or add some mods.

    Cruise: 27-29
    Top: 35+

    And, you? :helmet:
     

  2. jaguar

    jaguar Well-Known Member

    I think acceleration and ability to climb hills is just as important as top speed
     
  3. skyash

    skyash Active Member

    77.1kmh. 26inc wheel with 36 tooth sprocket stock head and carby got one more 20inc wheels 28 tooth sprocket 68.kmh you just push off with one big one and off it goes up hills not bad but it's for top speed not acceleration my daily ride has 20inc wheels and a 36 tooth sprocket no peddling to take off and hits 60kmh up to how you like it really
     
  4. jaguar

    jaguar Well-Known Member

    77kph=48mph
    60kph=37mph

    skyash, what crap! a stock Grubee won't go no 48mph, no freakin' way.

    Obviously you didn't take the time to calibrate your speedometer.
     
  5. skyash

    skyash Active Member

    No joke did once and never did it again I was in a 70 zone and past a truck then keept going. Started on a 2 block hill and flatens off to a long flat run for a 1 km did it the hole way after modifieding new motors to go that fast can't do it maybe right day fuel and that's what I got no bull
     
  6. bakaneko

    bakaneko Active Member

    47 and 70 mph?! you guys are scaring me! :tt1: I guess I built my bike wrong :sweatdrop:
     
  7. skyash

    skyash Active Member

    Is a Chinese $100 motor a grubee ? I have seen lot of lebo kids around here do 60 kmh all day long and that's 26inc wheel with 44 tooth sprocket so put a 36 tooth on and 5 kmh more so 65/70 kmh I work on a bike all week and the kids laugh at me when thay go faster all that work and a new stock motor go's better it's just luck all the motors are bad. try pulling out behind a car or truck and see if you can get pulled by the air flow stay just off the bumper it's like nos. Or find a big hill and when you are scared keep going blow that motor up if it comes to it.
     
  8. jaguar

    jaguar Well-Known Member

    my god man, you went downhill for 2 blocks and don't think that was cheating?!!! WTF?
     
  9. butre

    butre Well-Known Member

    no such thing as fast enough, my fully ported reed valve bike does 50-55 depending on atmospheric conditions and wind. some of the Miami guys claim to go faster but those bikes are geared so wonky they don't accelerate for ****, my bike runs about like a stock motor on the low end but then never stops accelerating, gets on the pipe a hair shy of 40 and hauls ass until it hits top rpm.

    I've done 65 with different gearing, but I don't like pedaling that much and lately its been throwing the pedal chain whenever I romp it too hard
     
  10. skyash

    skyash Active Member

    There's no cheating I know of I don't care how I get there. Just don't get caught. So whats the real go if you can do 50/60 kmh on flat ground put a better carby /muffler /head/jug/cdi/spark plug /light piston... And how fast can you go each claim more power and speed. On you tube some bikes done up don't look fast. I have asked lots of people how fast thay go and each has a different answer. I have driven past one man on a stock motor and my car speedo says 58kmh next to him looked like 26inc with 44 tooth . one kid says 60 kmh when I rode it lucky to do 20 kmh the lebo kids test next to mate's in cars. 20 Inc wheel 28 tooth sprocket 65 kmh all day it was my mate's we built it STOCK AS rock except the sprocket then sold it to the kid he come back and told us it does 65 kmh we new that already lol. YOU CAN NEVER GO FAST ENOUGH.
     
  11. skyash

    skyash Active Member

    every day ride 60+kmh


    DSC_0094.jpg
     
  12. jaguar

    jaguar Well-Known Member

    butre, what pipe and what is your RPM at 55mph?
     
  13. butre

    butre Well-Known Member

    the pipe is an aftermarket FMF one for an older cr125. I bought it for nearly scrap value because it had been bashed to hell. it was beyond fixing with just a torch, had to have sections cut out and welded back in

    at 55 miles per hour I'm just a hair past 9600
     
  14. jaguar

    jaguar Well-Known Member

    what are your port durations?
     
  15. bluegoatwoods

    bluegoatwoods Well-Known Member

    Well.........I guess I'll go ahead and throw in the opposite point of view.

    20 mph is more than enough for a bicycle. I usually average 12 mph over five miles or so. If I'm in a hurry I might average 15.

    Going faster than that is simply asking too much from a bicycle. And it's also asking for trouble. Really, anyone who wants to go 40+ ought to be on a real motorcycle.

    And I'm aware that there are those who disagree. God Bless and best of luck!

    But my advice stands.
     
  16. butre

    butre Well-Known Member

    I don't know the exact numbers off the top of my head, I'll have to measure it again. I had it all written down but I don't know what I did with that piece of paper. What I can tell you right now is that my exhaust port is widened significantly and raised several millimeters, intake is widened and lowered several millimeters, transfer walls are cut out, and I've got boost ports
     
  17. butre

    butre Well-Known Member

    I can pedal my way to 35. if using it as intended is asking too much then the bicycle industry has some serious explaining to do
     
  18. bakaneko

    bakaneko Active Member

    Take a look at this article from the bicycling.com. 35mph is over the average speed of a Tour de France pro by 3mph on the top end in a time trial. :cool2: Apparently, they cruise at 25-28mph, which is at my cruising speed atm. Note, their bikes are obviously extremely high quality and thousands of dollars each compared to mine which is like $20 used....

    On my nice hybrid bike, my numbers match very well to the average rider cited in the article. For me, I like to look at the motorized bike in comparison to a 50cc scooter, which has a top speed on flat ground of around 35mph and most people like to keep it a tad under 30mph. That is the point I want to hit on my motorized bike.

    http://www.bicycling.com/training/2015-tour-de-france/you-versus-tour-de-france-pro
     
  19. butre

    butre Well-Known Member

    that's cruising speed, not sprinting speed. look at last kilometer, not total average. I know of one tour de france rider who sprints over 40 mph
     
  20. bakaneko

    bakaneko Active Member

    ya, i agree. but, im saying bluegoats has a point too. 15 mph is probably the average speed manufacturers take into account for their durability and life span testing. probably more relevant in braking systems; many with coaster and pad brakes only. of course bikes will support speeds in excess. its funny the tour guys are right at the 66cc speeds
     
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