My new off-road motored bike

Discussion in 'Photos & Bicycle Builds' started by funker, Jun 7, 2008.

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  1. funker

    funker Guest

    This is my new motored bike, it's almost done, there are some minor details to end or fix, like finish the lighting system, or some fine tuning of the carb, but it's working fine for now.
    The bike it's a standard 26 double suspension bike, the only modification to the bike was the fork, and the disk brake in front. The engine it's an argentinan engine brand da-dalt, which is a copy of a Motori Morini Italian moped engine. This engine has 50cc of displacement, reed valve admission, and a very thick aluminum crankcase, very robust with very very big bearings, it's almost indestructible, that's why i choose it ;). It has also an Dell'Orto SHA1412 carb, a CDI ignition and lighting coil (both separated circuits) with a ducati magneto, a steel/aluminum cylinder (painted with high temperature black spray paint), and a custom made exhaust (which I want to change soon because it's not the best in terms of power output).
    The gear ratio was chosen for high torque, not final speed, so this bike climbs almost everything, and burn tires like nothing. It's very fun to ride because has very nice acceleration, and the engine has vibrations only at very high revs.
    Here there are some pics, hope you enjoy this "rare bug" :p trialera/DSCN00011.jpg trialera/DSCN0002.jpg trialera/DSCN00031.jpg trialera/DSCN00041.jpg trialera/DSCN00051.jpg trialera/DSCN00061.jpg
    Last edited by a moderator: Dec 17, 2015

  2. SimpleSimon

    SimpleSimon Active Member

    Very, very nice build there. I like that engine, and your placement of it does a nice job of answering some questions I had.
  3. Flippin' sweet.
  4. SirJakesus

    SirJakesus Guest

    Incredible unique build! It's good to see something totally new every now and then. Looks like that sucker can stop on a dime.
  5. I want one.
  6. brendonv

    brendonv Member

    WHOLY ****!! U got the same bike as me just custom forks, where did u get it? Mines the exact same OMG amazing.
  7. nopec

    nopec New Member

    wow! nice work - that's one of the coolest arrangements i've seen!

    where'd you find that engine?
  8. ocscully

    ocscully Member


    I'm curious about the bend in the crankset on the pedal drive side. Did you just bend it and get lucky and it not break or did you cut it apart and weld it back together? Is it quite a bit shorter than the crank on the left side? Is it auckward to pedal with the asymetrical spacing?

    Very interesting build by the way.

  9. BoltsMissing

    BoltsMissing Active Member

    Very well thought out solution to fit engine, unique.
    I have a bike similar, Avanti on loan to fit engine for a friend, one day.
    Your pictures are too cool for some ideas, thanks.

    How does the clutch operate and how do you start the engine ?
  10. funker

    funker Guest

    Thank you all guys for the positive feedback! that really encourage me to keep doing this things.

    I will answer your questions below:

    I bought to a friend of my, which is a distributor of chinese parts for motored bikes from china, here are quite common this forks, because are ideal for motored bikes, specially the one's with disk brakes.

    The engine it's from a 50cc moped, made in Argentina ( The engine it's a copy of an Italian engine (Motori Morini), very faithful by the way.
    I bought the engine very damaged for a few bucks and rebuild it entirely from top to bottom, including cylinder, piston, rings, ignition system, reed valve, etc.

    You are just right!, I cut it a little bit, did some bending and weld it again! I did that in my other bike too, and worked fine.
    It is little bit shorter on the right side, but not too much, but, because i didn't pedal too much, i don't feel the difference. The engine has an automatic clutch so you don't need to pedal at all if you want.

    The engine has an automatic centrifugal clutch, working in a oil bath. To start the engine i have an "old school" trick, the engine was designed to be kick started, but the kick system never worked fine for me, so i start the engine in the old fashion way, I wrap a very thick plane rope in the magneto, and pull hard, it's a kind of rope starting system, like in the outboard motors in the old cartoons.

    Keep asking if you have further questions! and again thanks for the posts!
    Last edited by a moderator: Dec 17, 2015
  11. ozzyu812

    ozzyu812 Member

    Simply stunning!!
    Do they sell engines in good condition?
    Do I have to learn Spanish to order one?:???:
  12. fastboy9

    fastboy9 Member

    Very very nice build. I've never seen a full suspension mountain bike that looks that good with an engine, you have done an amazing job on that! totally unique! I bet you get some heads turning out there. Nice job, its brilliant!
  13. funker

    funker Guest

    Thanks ozzyu812!
    I think the argentinian factory da-dalt still producing this engine, but i don't know for how long, because it's very very hard to compete with chinese four strokes engines like the ones you find in cubs. Actually, almost every argentinian moped factories are stopping the production of 2 strokes engines because chinese engines are cheaper even being of 4 strokes with gears.

    I think you must try to ask if they can send you an engine to your country, but i guess the shipping cost will be quite big. Here the engine (brand new) cost i think U$S400 more or less. I bought mine for less than U$S50 ;).
    They are working (da-dalt) as importers now, so i don't think that the language will be an issue.
    Last edited by a moderator: Dec 17, 2015
  14. funker

    funker Guest

    Thanks fastboy9!

    It was, and still is, a big challenge to make this "monster" work! But i really love it! (well i will not lie to you, i love all my bikes ;) )

    Im working on the exhaust which is the main performance issue right know, i finished a "home made" or "poor man" expansion chamber. I think i will test it tomorrow. Then i post my results, and the picture of it.
  15. jared3377

    jared3377 Member

    NICE BIKE!!! :cool:

    I'm jealous... :mad:
  16. Funker Very nice .!!!

    Imitation is the best form of flattery .

    Fabrication is my specialty and I hope you don't mind if I grab a few ideas from your wonderful Build.

    Last edited by a moderator: Dec 17, 2015
  17. Norm

    Norm Member

    Totally Rad!!

    Love it!
  18. funker

    funker Guest

    Thanks jared3377 and Norm!

    BlueCollarBikes, no problem, take the ideas that you may need, my only condition it is that you send me or post the pics later :grin:
  19. funker

    funker Guest

    As I promised...

    As I said before, I was working on a home made tunned pipe / expansion chamber.
    You can check in the attached picture , the result. Of course needs to be restyled, because it's just the first test, but i must say, the results are astonishing, I think the final speed doubled, or so, anyway it's too fast for a bike (and the torque and acceleration still greats!). Of course the carb has to be re-jetted from a number 54 to a 60, a good sign, because if the engine "request" more fuel after a exhaust modification it's symptom that the gases have a better flow.
    Now the bike it's running the way i like it. And sound great too, like real enduro motorcycle, specially at high RPMs.

    Attached Files:

    Last edited by a moderator: Dec 17, 2015
  20. ozzyu812

    ozzyu812 Member

    If you ever get the time PLEASE,PLEASE make a U tube
    video! I'm certain we all would love to hear it!
    I think you have a real talent. You should build'em and sell'em! You would make a KILLING!
    Last edited by a moderator: Dec 17, 2015