Bumble bee, the fast and pretty

New game plan. I’m going to use a peugeot seat with maybe upholstery, an ebr frame brace, a round headlight, a peugeot 103 spx kick stand, I will paint the wheels black and probably keep the bumble bee spirit by adding some yellow accents. Now it’s starting to look like a cool ped. I’ll try to update the article later with new pics.

Peugeot 103 RXC 49.9cc moped, 14 hp 14,000 rpm.

I don’t want my 50cc race moped to rust in my shop until the next race April 7th 2012 at Grange’, so I decided to remove the fairings and register the bike to blast it once in a while on moped rides. Before that I’ll do a complete engine checkup and will change the transmission for street riding top speed. The negative side is that the more miles you put on a race engine the less it performs at its full potential on the track for race day.

I installed a long seat and a Tomos square headlight for now to make it look more like a street moped american style. I’ll probably paint the wheels black, re-weld a straight frame brace, get a round headlight and modify the seat cafe’ style later.  The purist french racers and bloggers are going to tease me for removing those awesome vintage Bidalot fairings but we can’t please everybody and since nobody races in California I have to take that bike to the streets. Plus the bike will also blend much better next year on the track racing against other mopeds or 50cc to 200cc and electric motorized bicycles.

The only thing missing is the license plate and the pedals but there were no pedals on the stock peugeot 103 RCX 90’s version with pegs and kick start like many other mopeds, Honda, Vespa, Motobecane, Tomos, etc… It’s almost impossible to install pedals on that bike, there’s no thread for a rear bicycle freewheel, no front sprocket on the shaft or even room to weld one. I’m still keeping the moped spirit by using a 49.9cc limit engine and after market Peugeot moped parts only, except for the auto electric water pump. Even the vintage Fournales ole0-pneumatic shocks were made for the 103 RCX frame.

Bonus video : Another fast Tomahawk 50cc motobecane.

Melvin’s motobecane Av10 polini 50cc kit with stock cases is almost done. He built the bike and I taught him how to properly assemble the engine and slightly port the cylinder W exhaust port. He custom made a swing arm, clip-ons handle bars, dual launch lever, exhaust ball joint springs system, cut and re-welded the frame’s tail to adapt new shocks (gave up the mono shock project), installed a disc brake and custom fork brace, etc… He always find new ideas using cheap parts available at his auto body shop.

I stopped by Friday night for his birthday and first start of his new moby. I reassembled the 19 carb with all the right settings, timed the ignition, tuned the doppler variator + launch lever. I did a full session breaking in the engine on the stand before doing some test runs. WOW… the 50cc polini  kit rips! Good torque and some serious power even with the small 52T rear sprocket. That bike might be faster than any of our other mobys and Melvin is light too. Once completely done the bike will get a new paint.

Somebody’s gonna have a big smile on his face blasting through the streets of  LA at 70 mph.

As you probably already know, you can find all those performance parts at http://www.treatland.tv the best moped parts store in the universe and build your own fast motobecane engine or have all the parts shipped to Tomahawk for complete assembly, tuning, testing, shipped back to you and experience the real 50cc power.

 

 

 

Who said Motobecane av10 variated mopeds can’t go as fast as one speed puch mopeds and hold top speed for miles?

I think those Turkish Kamikazes use a stock av10 bottom end + 70cc kit + modify stock pipe + small rear sprocket. Ok, they ride downhill on a light frame and small tires with an aerodynamic position but still that’s not bad… I read 80 mph on the speedometer. Those bikes don’t have good acceleration in the city though and are built to break records on the freeway.

13 comments

    • tomahawktuning

      Yeah nice seat.
      I sat on it and it feels really comfortable.
      It’d look even better without the frame brace and seat slightly forward.

  1. eric

    what are the specs on the 19 carb? needle, slide, jets etc. trying to dial in my stock av10 matched to a malossi 50, doppler crank, ninga g3, er3 vario, points, malossi hi comp head w decomp and 11×54 gearing.

  2. tomahawktuning

    Sorry man, I already give a lot of info but can’t reveal all the chef secrets 😉
    Plus the carb settings vary depending on cylinder transfer ports, pipe size, timing, plug type, weather conditions, etc….
    It takes a lot of hours of tuning and street runs, testing one variable at a time.

  3. tomahawktuning

    Yep. Doing your own testing is probably the best way to become a better tuner.
    Also spending a lot of time reading books at first for the basics and hang out at a 2 stroke shop observing and learning from an experienced tuner if you can find one willing teach you.

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