My new off-road motored bike

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
http://i80.photobucket.com/albums/j174/volker242/la trialera/DSCN00011.jpg
http://i80.photobucket.com/albums/j174/volker242/la trialera/DSCN0002.jpg
http://i80.photobucket.com/albums/j174/volker242/la trialera/DSCN00031.jpg
http://i80.photobucket.com/albums/j174/volker242/la trialera/DSCN00041.jpg
http://i80.photobucket.com/albums/j174/volker242/la trialera/DSCN00051.jpg
http://i80.photobucket.com/albums/j174/volker242/la trialera/DSCN00061.jpg
 
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SimpleSimon

Active Member
Joined
Apr 18, 2008
Messages
1,181
Very, very nice build there. I like that engine, and your placement of it does a nice job of answering some questions I had.
 
S

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.
 

brendonv

Member
Joined
May 18, 2008
Messages
287
WHOLY ****!! U got the same bike as me just custom forks, where did u get it? Mines the exact same OMG amazing.
 

nopec

New Member
Joined
Jun 1, 2008
Messages
1
wow! nice work - that's one of the coolest arrangements i've seen!

where'd you find that engine?
 

ocscully

Member
Joined
Jun 23, 2007
Messages
659
Crankset?

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.

ocscully
 

BoltsMissing

Active Member
Joined
Jan 31, 2008
Messages
897
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 ?
 
F

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:

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

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.

where'd you find that engine?

The engine it's from a 50cc moped, made in Argentina (http://www.dadalt.com/motor50.htm). 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.

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?

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.

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

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!
 
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