My ATC 70 Build w/ Piranha 150 motor

[250rmanfmf]

Here is a project I finally have gotten around to. I bought the bike two years ago and it sat. Now I ordered lots of parts and did some welding and have a good start to my project. I am using a 150cc piranha E-start motor. I ordered the front brake kit and rear brake pedal kit. I still need to sand and polish the red plastics. I also need to mod the gas tank as carburetor hits.

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[Darius1502]

Wow...I'd love to ride that. I loved my little 70....gotta pick on of those up again!

[MattDragontamer]

I would love to have that engine, but the cost is waaaayyy to high. Looking good, keep'em comming.

[Keith Salyer]

Looks like a lot of fun to build and ride.

[jakep53]

Very nice work!! it will be a load of fun to ride!!!

[John jr]

Looking good. Your going to love that motor.

[JasonB]

sweet 150 man! entire build is looking great so far keep at it

also are those just the ebay hubs that fit the 250r etc? I am getting the 70 bug and learning as i go. total newb question lol

[250rmanfmf]

Thanks for the support guys. The hubs are trx450r extended G-force hubs. 250r hubs wont fit the atc70 axle. I extended the frame also 2 inches. I am hoping to get exhaust and electronics all tucked away by end of next week then I need to polish the front and rear fenders.

[John jr]

Here's a little video of my ATC 70 - 150 E-start on the sand so you can get a Idea of the fun & power. I'm on the black tanked 70, following my little brother who's riding my wife's 73 ATC 70 with a 114cc Piranha motor.
http://youtu.be/9urNlq3AMCk

[250rmanfmf]

John, Very cool video, your bike looks like a lot of fun. I hope to head down to Oregon dunes next year when I get this 70 and my 250r and Tecate done.

I tried polishing the front fender today and had no such luck. All I am left with is a dull finish that wont shine up. I sanded with 400 and 800 grit and buffed with rubbing compound and then polishing compound. I don't think they are oem fenders as I believe they are maiers. So I need to figure out this polishing of fenders as they have lots of scratches and look like crap. If I cant figure it out then I guess I will just buy some new ones.

[250rmanfmf]

Have more pics. I am having issues with tank hitting the carb big time. I will probably dent the tank a little and shim it up but I am trying to figure out what to do.

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[rg97]

I gotta ask... What the heck is in the bacgkround of pic #9 from your first post?

[John jr]

Have more pics. I am having issues with tank hitting the carb big time. I will probably dent the tank a little and shim it up but I am trying to figure out what to do.

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You have the right Idea with the gas tank. Most do dent the tank to get the room. I use the bigger fiberglass gas tank that has a big knock out where the carb goes and has plenty of room. last I heard, The guy that makes the tanks wont be doing anymore till the end of the year.

[badandy]

Very Nice...

[jakep53]

looking very nice!! can you heat the manifold up red hot and bend it down to a flatter profile or build a custom one??
and what exhaust is that?? got a link?

[250rmanfmf]

cool, Thanks guys. rg97 that is a seadoo 951 DI motor.

[250rmanfmf]

Well its been a while since my last post but I have been working on this little guy again. Still working on figuring out the wiring harness but I should be done today with that. Also Was wondering if anyone has pics of cut rear fenders as I am not a huge fan of the wrap around (part that's between the front of back tire and your foot) fender look and was think of cutting them but would like to see pics. Also what are you guys using for petcocks as the atc 70 tank has two spouts and the new vm26 carb doesn't have the built in petcock like the stock carb.

Thanks

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[1upfront]

Well its been a while since my last post but I have been working on this little guy again. Still working on figuring out the wiring harness but I should be done today with that. Also Was wondering if anyone has pics of cut rear fenders as I am not a huge fan of the wrap around (part that's between the front of back tire and your foot) fender look and was think of cutting them but would like to see pics. Also what are you guys using for petcocks as the atc 70 tank has two spouts and the new vm26 carb doesn't have the built in petcock like the stock carb.

Thanks

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I just put a 1 inch piece of hose with a metal plug on the "on" spigot of the gas tank and used the reserve spigot going straight to my mikuni vm roundslide. I use a small set of match plastic pinch off pliers as a shut off. Also I was able to dent in the inside of the tank enough that I didn't have to use any washers under it. The carb tucked underneath nicely.199895

[John jr]

199901Here's how I cut my last rear fender.199896

[250rmanfmf]

Cool, Thanks guys for the info and pics. I just ended up plugging the second line also. Well, she is done! I am very happy with how it turned out. I just need to make some jetting changes and I may adjust my brackets to bring the front part of seat back down. Other than that I am done

Here is what the final product looks like, its not a show bike but I like how it turned out.

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[1upfront]

Looks good man i love 70's I have 250rs too but the bike70 gets all the attention. Not gonna run a front fender on that badboy? It might help with cooling if you do it like I did mine, it acts like a scoop for air.199925

[250rmanfmf]

Nope, no front fender as I like the look of no front fender so far.

[250rmanfmf]

Well took it out for a few runs and holy crap this thing is quick! Unless you are on flat ground 2nd is the gear to be in. On rough surfaces the bike seems too short and starts bouncing from lack of suspension and gets a little hairy. Other than that its a blast to ride. I will be looking at adding suspension at some point but for now will enjoy what I have.

[R.J.M.]

That thing looks amazing! Great job

[tecaterob]

Lets see the video..

[CRAZY70MAN]

Nice job....as a veteran of racing big bore 70s for years on dirt and ice....hang on is my advice!! Lol..have fun and respect it.....lol....it will bite!

[Dirtcrasher]

Looks great!! Plenty of sweet parts on there.

Gotta start building mine before winter sets in : (

[250rmanfmf]

Thanks Guys! I will get a video up when I can. I will be in the market for a suspended frame.

[Quinc]

Any more modifications or video? Also where did you get your front brake setup?

[magilla12]

Very nice, I’ll be doing a 140 soon, still gathering parts, and I would also like to know where you got the front brake setup.


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[magilla12]

Wrong place sorry