Motobecane 40T project
I’m going to build 2 rigid frame Motobecane 40T bikes with fast Doppler 50cc engines based on my Av10 race bike set up with stock cases.
1- The orange frame (bought in the US) is a commissioned project. We’ll use a set a red Grimeca mag wheels (imported from France) and powder coat them, mount an EBR hydraulic fork with disc brake. All the engine parts have been ordered, I just need to find a Doppler or Bidalot variator.
2- The 1971 blue frame project (imported from France) will be for sale. I might use some spoked wheels for a more retro look.
Bonus pics:
I worked on a customer’s 1978 Motobecane 7 moped that was starting but not running right. It was my first time riding a moby 7 and even though the engine is non-variated it’s a really fun bike.
Tomahawk Mopeds 
Very nice!!!! Does the Moby rear sprocket mount to the grimeca mag with no problem?
No. You have to buy a sprocket for 98mm hub size.
on my race bike i have a orange 40t with a doppler av10 set up but my variator has a clutch function because its also going to be a street bike and didn’t have money for both variators or a clutch pulley does it realy matter if i race with a clutch on my variator
There are no rules anymore. We need more racers on the track with any fast moped.
If you’re running a really powerful Doppler set up with the heavy stock variator clutch function you might break the crank at high rpms, most likely with a 70cc than 50cc though.
well its a doppler er2 with idle bearing
do u know what kind of speeds i should be hitting with this set up
It depends a lot on your tuning skills but I’m guessing around 55+ mph.
ok becuase right now im in the mid 50s
Cant wait to see more of that orange 40T as the build progresses!
It should be a cool bike.
I’m having trouble connecting my front brakes with the moby 6 star on my ebr forks. any recommendations ?
I need more details.
The original Moby six stars are designed for stock forks. The little tab that holds the brake plate in place has a curved shape that fits at the bottom right side of the forks. The ebrs have a little slot that works with the lelue puch/Peugeot brake plates. I guess my question is will the leleu brake plate fit a six star mag?
I’m not sure if it would fit. Leleu hubs diameter is 80mm and mag wheels are usually 90mm.
I would weld a thick U shaped guide on the existing plate to match the Leleu plate design.
were did u get that seat pan from
From france.
do u know were i can get one becuase im building a 40t but cant find a good seat and this one looks perfect
Treats may have some, they get used parts from France.