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Old 11-08-2014, 06:56 AM   #1
Samtech79 OP
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Derbi enduro trials bike?

Good idea?
I'd like to have one of those freeride type bikes, sorta halfway between an enduro and trials bikes. I don't, however, want to pay for one... The freeride, Osso, skorpa, etc are all big bucks.
In my shed lives an old stripped Derbi Senda 50 with no motor, wheels, guts...
I was thinking modding up the frame to except a YZ125 with a heavy flywheel, maybe a big bore kit and building some super lightwieght wheels.
I build pipes so a lowend grunt work pipe is the easy part for me.
Whatcha think? Good idea or crack smoking?
Looks like this...

Samtech79 screwed with this post 11-08-2014 at 07:33 AM
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Old 11-08-2014, 03:10 PM   #2
chollo9
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No, that's a great idea! I had a Fantic 50 ISDT in the early '80s. It was really cool, but it wasn't really good for anything. Always thought a 125 or 175 would've made it a great woods bike.
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Old 11-08-2014, 03:27 PM   #3
dhallilama
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i'm thinking great idea... love stuff like this!
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Old 11-09-2014, 04:58 AM   #4
Kennon
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a Dt 125 motor would last longer and be more manageable but good idea, I've seen NSR 125 engine fitted to a Senda 50.
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Old 11-09-2014, 05:18 PM   #5
villageidiot
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do it
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Old 11-10-2014, 06:02 AM   #6
Samtech79 OP
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Ok, that's all the convincing I need.
Think I'll get busy with some white and orange powder coating too.
It'll be a minute but I'll post some pics once I get started building.
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Old 11-10-2014, 08:44 AM   #7
morena67
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Subscribed, good luck...!!!
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Old 11-10-2014, 02:09 PM   #8
dhallilama
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a 125 with a pipe for low end & lots of flywheel weight and I'd think it to be a fun bike.

what's a derbi weigh? about as much as a few cases of beer? perfect!
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Old 11-10-2014, 03:09 PM   #9
villageidiot
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was in the shop today..... you know what motor would be a sweet powerplant for a bike like that. a yamaha blaster.

200cc air cooled, super simple, crazy reliable. can be built to 340cc with a stroker kit. no plumbing to worry about, just install, make pipe, and ride.
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Old 11-11-2014, 04:32 AM   #10
Leo.G
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Nice little bike to revive with a good engine...

Maybe as the guys said, an air cooled DT 125 or 175 would last a little more.. if not, the blaster 200 is another good option.
Not taking in acount the engine you use, please show us the build, it's a really nice idea!
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Old 11-11-2014, 08:28 AM   #11
woodsrider-boyd
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Dooo eeet!

I bought a dead Derbi GP1 scooter this summer, its supposed to be pretty quick - for a scooter.

I've been having a hell of a time getting parts for it, but I knew that going in. Spanish scooter, Italian motor, DOA in America, I'm trying to get parts shipped from Europe in August = frustration.

But that's ok, I knew all that going in.

Good luck man, keep us posted. -Ed
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Old 11-12-2014, 07:11 AM   #12
Samtech79 OP
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With my crazy travel schedule (work)... I got home for about 14 hours and spent it fixing things and picking up dog shit but I did manage to find some of the parts to this thing.
Can't find the fork legs though...and can't remember if I ever had them. Their 36mm conventional so if push comes to shove and I can't find them I'll get some xr100-200 fork legs. Want to keep the travel down to about 190mm so I can bottom and bump for trials style rock crawling.
I'm still thinking a detuned yz125 is the way to go. Watered, low rpm pipe and a flywheel should make for a little torqer that I can keep cool with a small biscuit fan. The derbi was watercooled form the factory and the radiator is fairly large. They made a 125 version that (I think) had the same mounts but had a slightly larger radiator but still fits in the same plastics.
Its ugly!
 photo 08E24DF2-8477-402F-B9E6-F708916FC355_zpsk1jrp1yz.jpg

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Old 11-12-2014, 10:25 AM   #13
woodsrider-boyd
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If you're thinking YZ125 smoker engine, also consider the Husqvarna WR125 motor. Heavy flywheel weight, 6 speed. The thing is a mini torque monster, especially with a Lectron carb on it. Gear it way down and you will be good to go.

They are cheap as hell too, but certainly not as readily available as the YZ125.

And did anyone already mention the KDX200 motor? Another mini torque monster. Should be readily available.
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Old 11-29-2014, 08:27 PM   #14
Samtech79 OP
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Got some spiffy white plastics for it. Got a lead on a motor too!
 photo 6A194AD6-AF5C-431F-98CD-B704354DB314_zpsiuzuqsc1.jpg
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Old 11-29-2014, 09:30 PM   #15
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Yeah, a KDX motor would be the cat's ass. Tough to gage perspective from the pics, but it looks like a small cavity to fill.
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