sup people!!

[ceedantech]

Hi there, I'm chris and i live here in pittsburg CA .I just built my first motorized bicycle (friction drive).

here is my mobike info.

Marin MTB (i don't have any idea what model my bike is).
GP460 chun yang (r460) its a 45.7cc engine.
DAX Motor mount from RoadBugmotors. (not Advertising)

and it runs 43 mph in 3/4 throttle.

 

[butterbean]

Your speedo is set to km/h, not mph.

 

[ceedantech]

yeah... im just using my phone to convert kmh to mph.. 71.3 kmh = 44.3 mph.

 

[Fabian]

71.3 kmh = 44.3 mph.

Going downhill...

 

[ceedantech]

nope i did that on flat surface.. its not a big deal for me coz i dont know how accurate my speedometer is.

 

[butre]

I don't believe for a second you did 44.3 mph with a friction drive setup.

 

[ceedantech]

yeah next time i'm gonna try to make video and use garmin gps (i guess its more accurate than speedometer).

 

[ceedantech]

i guess hawaii_ED or MR57HEAVEN did 44 mph in 3/4 throttle too with same engine and friction drive . here the video link from youtube https://www.youtube.com/watch?v=EHrMLeQqgRU

 

[butterbean]

If you are using an electronic speedo, and you've programmed it correctly (measured your wheel diameter from the outside of your tire and input that instead of the measurements provided with the instructions), then your speedo could be within +/- 3mph. If you have a smartphone, you can download a speedometer app that uses gps. Many of them are free. But yeah, I don't believe 43 on a friction drive. I don't believe anything over 35 on a stock china 2 stroke either. I'm not trying to call you a liar, I just don't think your speedo is programmed correctly.

 

[Fabian]

But yeah, I don't believe 43 on a friction drive. I don't believe anything over 35 on a stock china 2 stroke either.

I agree. 101%

I am suspicious at anything over 25mph on a stock Chinese bicycle engine.