Cobra exhaust pipe size (atc 70)

[jays375]

I have a Cobra exhaust for my ATC 70 coming.My 70 has a 125 Lifan installed in it.So I will have to modify it and would like to know the O.D. of the header pipe before it comes.That way I can have some pipe around to do it.

[Jessman]

did you ever figure this out? i have seen some cobra exhausts for sale lately and am doing a 125 lifan swap on my atc70 soon. What all did you have to do? Will the stock atc70 exhaust bolt up to the lifan?

[jays375]

Yes,it was for a 73 Atc 70.It wasn't a simple bolt on.The pipe was for a newer machine.Didn't take a whole lot of cuting and welding to make it fit.

[Jon Boy]

recently got a 74 myself. please post some pics when/if you can, i'd like to see what you did and how it looks. a vid for the sound would be the cats meow though. :beer

[jays375]

I actually routed it pretty close to what the original went.It exited out the rear also.Sorry no sound clips or pics really.It sounded just like a big bike.Repacked the muffler really tight and it sounded pretty good for a Cobra.Think it only took a 1 1/2 to do it.A friend of mines 10 year old son owns it now and drags it.He is down into the 6s in 300'.It will outrun a 250 Fourtrax.The motor is a Lifan racing with the auto clutch.

[Jon Boy]

no pics? oh well, can't win all the time. :lol:
stock exhaust location that's the plan, looks to be about the only choice really for the first gen 70's after thinking about it. might do a lifan swap in a year or two to save the original, unless something happens to the original motor before then.