Stretched DEEPA's ATC70 frame 3"s.....

**Dirtcrasher** · 08-10-2009, 05:19 PM

I finally got in my metal stock this week and got some work done. It wasn't easy to find the size and wall thickness I wanted with a compatible piece of steel in terms of weldability.

This 3" stretch really makes the 70 much more comfortable for us big guys and the way I've done it, I added a good amount of strength.

I stretched it out 3"s and used a 12" tube, so ultimately you have 4.5"s forced in to either end. I think it's important that your tube reaches the stck gusset for the best strength.

I asked questions about tubing sizes before I did this and then came up with my own solutions. IMHO, 1.750 is far too small for a good tight fit. The inside ID of the stock 85 ATC70 frame is nearly 1.875 or 1 7/8ths inch and I found a way to deal with the obstruction of the inner weld on the stock 70 top tube. So, I got some tubing that with a bit of machining, I have to bang it in with a 2lb

which was just what I wanted

. I mig weld all that up and then put another piece of tubing over the splice and mig weld that in place too.

Were still in the rough stages, I ran out of Argon but when it's done and powdercoated, my goal is to have a stock appearing and seamless super strong stretch

I still have an upper frame support to fabricate and weld in place and I have to machine and move back the gas tank posts. But other than that and some smoothing, we'll be good

These frames aren't allot that expensive to ship and again I'll throw it out there and offer this service to others if they want it done........

At some point, I want to make my own suspended frame. I also think I can fairly easily remove the existing top tube and weld in a complete length of 3MM wall tubing instead of the stock 2MM wall tubing to strengthen the stock design and eliminate any extensions, but believe me, this tubing is not gonna bend

Work in progress

**Lukeatc185** · 08-10-2009, 05:21 PM

great looking welds DC, well done

**shortline10** · 08-10-2009, 05:50 PM

Looks Good and strong to me . Nice job!!!!

**BigRed_Ryno** · 08-10-2009, 06:22 PM

Looks good, I wouldn't have any worries riding it, an im a fabricator welder......
I also quite fancy making my own suspended frame, but its pretty much just a day dream in my head at the mo... Keep up the good work

**tulsamike3434** · 08-10-2009, 06:26 PM

great work!

**Bryan Raffa** · 08-10-2009, 06:27 PM

Good to see de

pa keepin you Employed!!! L@@K'S G@@D

**tanks350x** · 08-10-2009, 06:34 PM

Looking good DC, but you know that already

**AutoXer** · 08-10-2009, 08:13 PM

wow I hate seeing people malest these stock out of production machines to use as they were not intended ..... I mean where is the 160cc lifan?

**KASEY** · 08-10-2009, 08:28 PM

Originally Posted by AutoXer

wow I hate seeing people malest these stock out of production machines to use as they were not intended ..... I mean where is the 160cc lifan?

there are thousands of 70 frames out there!!! i sure as hell don't see a problem,,,

so crasher are you going to relocate the seat and tank? or just let the 3" extention stick out in front of the tank? OR go the hard route and strech the tank to coneal the strech?

**Bryan Raffa** · 08-10-2009, 08:32 PM

ya what Kase said^^^ what does it look like with the tank splitting the diffrance? To mutch gap between the tank and seat?

**jeffatc250r** · 08-10-2009, 08:40 PM

Looks good DC. If you ever have a problem finding the correct size tubing for whatever, give me a shout. My neighbor is a steel guy and has literally several hundred thousand pounds of all different sizes. He stocks even the oddball stuff.

**Dirtcrasher** · 08-10-2009, 08:45 PM

^ Guys, that is up to Mike..... I have already designed a TOP gusset that clears the tank within it's stock location. If we move the mounts back, I can make an even longer gusset.

Now that I'm pondering this, I'd imagine one thing to do would be to extend the seat pan forwards? Plenty of us have a big arse anyhow

Mom made the seat covers, I can add material to that pattern and foam is chicken, the only thing would be the pan. But there isn't much to that either........

IDK, I have to think about it but I won't be extending the gas tank

I think once I put in my slick angled upper tube top support, you won't really notice the stretch - almost like a Nicholson frame.........

EDIT - THANKS JEFF!! I did find a great place with tons of DOM tubing (in 1/16 increments) and good shipping costs, I stocked up

When I had to jam that tubing in there (after machining) instead of letting it flop around, I was PSYCHED!! It fits so well that to plumb the neck to a level rear axle, I had to use a

and whack it a few degrees while I tack welded. THATS the perfect fit I wanted

**Bryan Raffa** · 08-10-2009, 08:47 PM

nicely planned.. like the seat route....

**Daddio** · 08-10-2009, 09:21 PM

When I stretched my frame I only went 2" and I split the difference by moving the tank back 1" in the front and because of the stretch I extended the bracket for the rear tank mount 1" forward to line up with the mount on the tank. The seat still touches the back of the tank. It worked out real well.
Here is a pic of it at TF. You can see the gap in the front but the back looks fairly normal. Another bonus of stretching these is that you won't have to worry about the engine rubbing a hole in the front fender any more.

**Bryan Raffa** · 08-10-2009, 09:23 PM

thanks for postin that daddio.. would have never noticed......

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Stretched DEEPA's ATC70 frame 3"s.....