Custom ATC70 minibike hybrid

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MuckUte

MuckUte

Well-Known Member
Joined
Nov 3, 2008
Messages
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Location
Adelaide
After a resto on an old ATC70 that i had i decided that with some small mods these little 3 wheelers would be muc more fun.

First step was to find some donor bikes

This trike came up and i already had a minibike lying round
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After striping the seat and tank mounts off the mini frame i got an axle carier machined up to hold the ATC axle then made a swingarm to mount the ATC axle to the mini frame

IMG_0668.jpg
 
The next step was how to attach the fat front wheel to a mini frame. After much internet searching i ended up getting a custom set of alloy triples CNC'ed to suit USD forks

IMG_0788.jpg


IMG_0670.jpg


Now i had a rolling chassis to work on. The above pic shows the temporary frontend before i got the triples done
 
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Now came time to make it look like an ATC70 again......

All the mini seat and tank mounts had to go and new ATC mounts fabricated.

IMG_0686sm.jpg


And to make sure it would stop a disc brake had to be made up

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After cutting out the center hub from the drum i made a plate to mount a mini brake disc to the hub and also had to make a mounting bracket to mount te caliper to the swingarm.

IMG_0713sm.jpg


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This is what i had. The biggest problem i now had was that it was nearly 200mm higher but still had the same rear axle width which meant it was real keen to tip over so some wheel spacers were called for

IMG_1263asm.jpg


Now the bike was nearly finished
 
To get the 110cc to fit i had to modify the intake manifold to clear the fuel tank, don't have a TIG on and but found some alumnium brazing rods on the internet and after some practice i ended up with this
IMG_0614sm.jpg


To control the back end a new shock was called for so a DNM shock went in
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and some new Douglas aluminium one piece wheels and some holeshot tyres for some bling
IMG_0790sm.jpg
 
Here is the bike as it stands at the moment

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Front USD forks with custom alloy triples

IMG_1768sm.jpg

Only a 110 (lookin for somethin bigger) with pullstart off ATC70

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Rear swinger with disc brake conversion and DNM remote reservoir shock

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Still needs work to tidy it up, on the list is

  • Seat cover
  • Protaper bars
  • Paint job
  • 160 engine
 
nice work mate :)
the back end looks a little high for me but thats all. maybe a bigger front wheel?
love all your custom fab' work though.
what front forks are they?
 
good work mate its good to see another trike lover. Our gang ride modded honda 70s there like the OG of old school mini bikes we've had ours for years. All of our lot though havent moded the frames though we just jam pit bike gear and engines in any way we can.
 
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bradisfun said:
nice work mate :)
the back end looks a little high for me but thats all. maybe a bigger front wheel?
love all your custom fab' work though.
what front forks are they?
Click to expand...

Thanks all for the great comments

The back does level out once it has me sitting on it. I have a 1000lb spring in there at the moment but i think that is a bit hard.

The front forks are these i think, as i got them privately
GOLD ANODIZED USD FRONT FORK 635MM CRF STYLE PIT BIKE (eBay item 110556124930 end time 04-Nov-10 05:15:14 AEDST) : Cars, Bikes, Boats
 
looks amazing mate, my mate had one of those 70cc trikes, unfortunatley doing some work on a farm, starting a chainsaw , it burst into flames and then sadly took the trike aswell, although it has proved itself to be a fun rebuild project, new motor is all we need now and were almost set!
 
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