Tagged: 28mm aluminum clip-ons

Test ride: Tomahawk clip-ons and pulley Xtreme kit

Last night I test rode my motobecane Av10 moped 50cc with the Tomahawk 28mm clip-ons and the Doppler clutch pulley with the Tomahawk Xtreme kit + push/pedal start one way bearing HFL 3030 wider than stock (I had to lightly grind the circlip to clear the shoe springs).


The tubes can be cut or inserted deeper but I wanted to test the widest position with the tubes 10.5 inches long from the clipon. Even though I was afraid that the aluminum tube gauge might be a little too thin, matching the standard handle bars steel gauge (to fit any bar end without drilling), they were actually strong enough after braking hard with my upper body weight on them and hitting the potholes of Los Angeles bad roads. The advantage is their super light weight and if you crash they’ll probably bend or break before the expensive CNC machined clipon part. The racing position with 8 degree angle felt good, I like them.


The heat treated 8mm posts + the triangle brace are bulletproof. The brace is not stainless steel so remember to wipe it with oil to protect it from potential rust. The push start HFL 30/30 one way bearing upgrade is wider and feels stronger than the stock doppler 30/20 bearing, with no shuttering problem. So far so good, the best one out of all the one way bearings I’ve been testing. The clutch pulley doesn’t shutter anymore. Thanks for the tip Naz! (moped builder and racer from Seattle).


Back from the ride. The clutch grabs a little late at high rpms with the strong clutch stock springs, feels good for track but might be annoying, loud, and fuel consuming for street riding. Also, my piston ring is completely worn out with loss of compression and power, the engine revs high but with less torque doesn’t pull as hard as it used to. The Bidalot 50cc kit is a 3rd hand with thousands of miles on the nikasil and a leaking exhaust ball joint, the port duration was also set for high rpms and top speed for the track, not low end power. I couldn’t go full speed, too dangerous with the cell phone is my left hand.


The raffle ended today Wednesday, Feb 1st 2012. Thanks everybody for the great feedback!

And the lucky winner is….


From the Mohawk Mammoths, Albany NY.     http://mohawkmammoths.com/

Congrats man! Email us your shipping address so you can rock those Tomahawk clip-ons on your bike soon.

Tomahawk 28mm clip-ons prototype

So far so good…

Made in USA.

The 1st batch is here! The clip-ons will be FOR SALE very soon here on the Tomahawk blog and at Treats http://www.treatland.tv

Working late nights getting the clip-ons ready, compressed air cleaning, thread and quality control, aluminum 7/8 tube cutting, Allen screw assembly.

Perfect racing position with a fix 8 degrees angle just like on my Peugeot 50cc race moped.


Sneak peek at the “Transformer moby” project by Overkill (chassis) and Tomahawk (race engine).

Engine set-up:

Stock av10 cases ported, Doppler kit 50cc air ported, Malossi crank, Doppler stock reeds, Dell’orto 19 carb, Doppler pipe, Mvt cdi, Bidalot Junior variator, Doppler clutch pulley, stock engine spring, launch lever. Probably an h20 50cc set-up in the future.

Check out the size of that fat rear tire (3 inch tubeless) with the wide stock mbk av10 magnum square swing arm! I can’t wait to see the future gas tank side covers with aluminum CNC machined motobecane raised 3D logo.

Engine cases disassembly:

Case matching + billet LED tail lights:

Cylinder porting:

Setting the transfers and exhaust port duration at Gr1 moped racing specs + Bidalot variator.


The engine is built so tight with precision.

All surfaces were carefully checked. The crank perfectly centered. The cases are assembled with special crank seals not available at any moped part store, new grade 8 7mm bolts + stainless steel spacers. The head is mounted with malossi long nuts M7 and stainless steel thick spacers + O ring and professional super resistant sealant. The squish is safely set for 91 octane fuel. Blue Loctice applied where needed.

Next is the ignition with timing set for high rpms + aluminum welding inside the intake manifold to match the stock reed block for a perfect gas flow.

Even though the cylinder is not lubricated yet on that video, the compression is already very strong! Just what we need for crazy 50cc power.


I’m getting ready to build my cafe scoot /drag ped project powered  by a minarelli 77cc 23hp dual variated scooter engine. I’m still undecided and looking for advice. Please check out my last post on mopedarmy to help me take a decision, thanks.


My motorcycle frame is a Hodoka Ace 100: