My new rat atc 70

[jeffatc250r]

Picked up this ugly lil critter today. Im thinkin slam a lifan 125 in it and call it the party-bomber. Its your typical POS that has been used and abused relentlessly. As you can see the forks were heated and bent back, Im gonna assume it was tweeked bad from the worn out front tire, All three are ohtsu, just the front is smoked. Tank is dented with jb along the bottom left seam. Grab bar is mia and the mount has been welded by what appears to be a 3rd graders first attempt, motor has no compression.

WTF was I thinkin :crazy:

http://i1021.photobucket.com/albums/af333/skunkhunter/DSC00926.jpg;';

http://i1021.photobucket.com/albums/af333/skunkhunter/DSC00927.jpg;';

http://i1021.photobucket.com/albums/af333/skunkhunter/DSC00928.jpg;';

http://i1021.photobucket.com/albums/af333/skunkhunter/DSC00929.jpg

[ATCeeya]

you get a good deal on it? looks like a good project

Id buy the pullstarter off you if you dont use the motor

[jeffatc250r]

I got it for a song. I will keep you in mind if and when I swap it out.

[jeffatc250r]

Also, can anyone ID the year by looking at it? Or should I post up the vin?

[ATCeeya]

i think 78-83 is a 3 speed down shift pattern, 84 was 4 speed down shift, 85 was 4 speed up shift

[jeffatc250r]

Guess its an 84, 4sp down

[3wheelmecca]

thats what mine looked like when I got my ATC70. Mines an 85 and is mint, i am selling it. That bike looks like a very solid start, its all there.
nice find.

[Vealmonkey]

You got quite a project there. Bent forks, possibly bent frame. Messed up fork stops. You'll be busy for awhile. Take the number off the engine and plug it into the trike id thread posted on here somewhere, that should tell you for sure. Sometimes the 70s can be a mix and match of all kinds of parts. Good luck with your project. Get cleaning that little monster up.

[oldtime3wheeler]

Thats a great starter trike. Have fun with it.

[jeffatc250r]

Update on the rat. Took it apart a lil bit. The no compression is just merely a stuck exh valve. Cyl is in great shape, so is cam, lifters etc. The frame IS bent at the neck. I figured it would be. No biggie, just gonna straighten it and brace it up. Im 250lbs so its gonna need reinforcements anyways. Seeing as how all I can see wrong with the motor is a lil valve work, im just gonna fix it and run it. The forks are pretty much junk, so Ill be in the market for a set. Also the exh was rotted off at the head, so Ill be lookin for an exh also (hint hint)

http://i1021.photobucket.com/albums/af333/skunkhunter/DSC00930.jpg;';

http://i1021.photobucket.com/albums/af333/skunkhunter/DSC00931.jpg

[oneroom42]

i have an atc 70 that has the same gas tank stickers on it and its an 83. so i would have to say its an 83 unless the tanks were changed.

[jeffatc250r]

Who knows, engines get swapped, fenders, tanks etc....

The numbers on the frame are jh3tbo300dc8176##

Where are the numbers on the motor?

[jeffatc250r]

As far as reinforcing the frame, my intentions are to straighten out the neck, get a piece of thick wall tubing that has a 2 inch ID and shave a lil off in a lathe to match the OD of the original frame tube. Cut the tube in half and then run it from the front tank mount to where the frame gets boxed in behind the air filter can and weld it right onto the original frame tube on the top. Theres plenty of room as far as tank clearance. Also gonna plate the rear where the grab bar mount is with some 3/16 and weld on ears for the rear grab bar mounts. Any other suggestions-weak spots on these lil buggers?

[MonroeMike]

It's a 83.

Check behind the shifter for the engine serial number.

[jeffatc250r]

Ahhhh, had an inch of crud hiding it,

TBO3E
2818805

[MonroeMike]

1983 also.

[jeffatc250r]

Guess Im goin insane, coulda sworn its a 4 spd

EDIT Just did some digging and found82-84 are indeed 4spd, just got thrownoff a bit from the post from a fellow member that made a mistake

[ATCeeya]

my bad...learn sumthin new everyday

[jeffatc250r]

No prob dude, were all human, well except for a few inbred tards on here, but thats besides the point!

Just found that the sparkplug hole is stripped; Whats the fix for this? Ive never tried to heli a plug hole before, can I go with a bigger dia plug? Or should I just look for a new empty head and play swap da parts?

[brrcuda]

put a 88cc kit in it. Thats what deepa and I are doing. So we can race equal machines, someday.... And give it some more snot to pull you around. Mines sitting on the floor waiting for the kit now.

[jeffatc250r]

Paul! How you been? We need to get together soon. You still got the crazy schedule goin on? For the price of the big bore, I think the better option is a whole motor. Piranah 140cc complete kit with everything but a clutch perch is 300 to my door.

[three_wheelin45]

wish i could find a atc70 cheap enough ive already looked into the lifans.hehehe

[oneroom42]

as far as the weak spots on the frame there are 2 main things that i know of. the main tube bending like a rainbow but it sounds like you have a fix for that and the second thing that comes to mind is the steering stop tab at the bottom of the headset. it usually bends or breaks off leaving you with dents in the tank after turning to far. iv heard of the heli coil working great on the sparkplug hole but i myself just replaced the head. i would also like to put an 88 kit on my 85 but its so hard to spend the cash when you could have a japanese motor for the same price with twice the power. i put the pitster pro 155z in my 84 and it is tons of fun and i havent even broke it in yet. these machines are rediculous fun with never ending options. good luck with your 70 and were here to help!

[jeffatc250r]

^^How you like that 155 engine? My friend is going to let me borrow his 140 to see if I like it in the 70. For putzin around and doing wheelies, Im almost thinkin a semi-auto would be better,...I dunno. Im going to atleast get the 70 engine back up to par and then decide what to do from there.

[Vealmonkey]

Your not done yet? LOL

[jeffatc250r]

Lol, na not yet. Got it down to a bare frame now,..gonna try and get all the fame mods-fixes done at some point this week and start putting it back together

[jeffatc250r]

Gave the frame a massage with a bottle jack,

http://i1021.photobucket.com/albums/af333/skunkhunter/DSC00933.jpg;';


The end result,

http://i1021.photobucket.com/albums/af333/skunkhunter/DSC00934.jpg

[atc350xer]

love the art you got on your walls... that splash of red really spices up the place ;)

[MonroeMike]

That came out good.

[the great gazoo]

love the art you got on your walls... that splash of red really spices up the place ;)

Of course you snapped those pics facing the best part of your shed. Does the other R run?

[trikes4life]

I know them R's got me sidetracted, for a moment. lol

[jeffatc250r]

The other R has the top end off. I bought a new piston for the paul turner jug I have for it and had it matched. Got it back from the machine shop and realized that i had bought a long rod piston. I was prob half in the bag when I ordered it. Now I gotta get the correct piston, It pisses me off to have to buy another piston, so I keep putting it off. Anyone got a new .030 piston they wanna swap for a long-rod model? :lol: