ATC 70 motor swap question

[250rmanfmf]

I have a atc 70 I am going to build. Will probably do a crf70 frame and build it to have front and rear suspension. I am stuck between a few motors. One is should I do a built ATC 90 motor (stroker, big bore, big cam, upgraded clutch, big carb) Or should I do this motor http://www.ebay.com/itm/PIRANHA-150cc-ENGINE-E-Start-CT70-Trail-70-Z50-ATC70-/330827438660?pt=Motorcycles_Parts_Accessories&hash=item4d06da1a44&vxp=mtr


which would be cheaper? I like the idea of all honda motor but if its gonna cost 800 bucks to build a 90 then the piranha sounds better.

Thanks
Tyler

[roostin atc]

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[roostin atc]

Go for the piranha. Unless you have your heart set on a big bore. Piranhas are cheaper and have plenty of power.
No replacement for displacement.

[John jr]

I put the 150 E-start in mine and I love it.
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[250rmanfmf]

I put the 150 E-start in mine and I love it.
165069165070

What carb are you running?

Tyler

[hoosierlogger]

I put a Lifan 140 in an ATC 70. I have almost 900 in the whole bike. I built a stroked big bore 90 with cam, intake, hd clutch yada yada yada. I have $900 in the motor alone, not counting the bike.

[briano]

I have a 70 with a Piranha 140, and another with an atc110 engine that has a 10.5 to 1 big bore piston, cam, pipe, and ported. I'm 250 lbs and my brother is about 190lbs, with me on the 140 I can out run the big bore 110 every time, from take off all the way to the top end. The top speeds are only about 5 mph or so apart but the 140 gets there faster.

[tblumer]

I put a yx150 in mine, its a fun drift trike.

http://i837.photobucket.com/albums/zz299/Tblumer/20120518_194811.jpg

[fastatc70]

Here is a pic of my atc70 befor the frame stretch165223
165224
155zs 64mm big bore kit , v2 head, 1.5"exhaust, inner rotor kit, 13-1 comp, s35 decomp cam. 17hp Dyno and 60 mph+

[fastatc70]

Here is a pic of my atc70 befor the frame stretch165223
165224
155zs 64mm big bore kit , v2 head, 1.5"exhaust, inner rotor kit, 13-1 comp, s35 decomp cam. 17hp Dyno and 60 mph+. Moto over heated because I didn't run a oil cooler. 1.5" frame stretch and a quick overhaul of the motor. I can post pick of the pullstart mod or the streatc mod if anyone wants.

[John jr]

What carb are you running?

Tyler
I'm running the Mikuni VM-26 carb on mine, Carb has been great. I did change to a K&N Filter with a wrap on it, Didn't like all the sand I was finding in the foam filter.

[nicker71]

I'd go with the piranha in something since your using a crf frame. I have about $1000 in my 70 with a honda 110 in it. I nice, not real fast but enough torque to move me around well. Plus I like the high/low range.

My next one will be a 150 electric start..
http://i156.photobucket.com/albums/t27/nicker71/IMG_0236.jpg


My brother just built one with a 125 lifan. The kick start sucks
http://i156.photobucket.com/albums/t27/nicker71/IMG_0729_zpsb72a1ad9.jpg