ATC 90 Motor. rare!

[lardog]

I bought this motor the guy said it was an atc90 motor i went to pick it up and it has a pauter kit, WOW. :Bounce:Bounce:Bounce:Bounce:Bounce:Bounce:Bounce
http://i49.tinypic.com/sdebty.jpg
http://i49.tinypic.com/156s5lt.jpg

[shortline10]

Very nice . The pauter cylinders are a very rare piece nowadays . How many cc's is it supposed to be ? Cylinder should be 61mm or so .

[shortline10]

Here is a pic of my pauter set up . This one is punched out to 180cc , even has the stroker spacer for the long rod .

[lardog]

Very nice . The pauter cylinders are a very rare piece nowadays . How many cc's is it supposed to be ? Cylinder should be 61mm or so .

Thanks I am not sure of the cc 's

[lardog]

Here is a pic of my pauter set up . This one is punched out to 180cc , even has the stroker spacer for the long rod .

Thats Awesome , This one doesnt have a cylinder spacer on it.

[shortline10]

You got an aftermarket frame to put that 90 motor in ?

[lardog]

Yes a few to choose from..

[shortline10]

Yes a few to choose from..

Now you really got me :drool::drool::drool: . I'm gonna need some pics . These old 90's are def my favorite . What other cool stuff you got ?:D

[lardog]

I will try to post some more pics soon..

[lardog]

:DHere some more pics...:D

[shortline10]

:DHere some more pics...:D

Glad to see I'm not the only NUT that loves these old atc90s . Wonder were Vealmonkey is at he would be :drool: over those goodies too . Very nice collection you got their . If you need something for that build just let me know I prob have it . :D

[lardog]

Thank You. I am definately Addicted also ....

[Vealmonkey]

What? Who? Goodies? LOL No wonder I'm not getting any good stuff anymore..

[lardog]

This cool old stuff is hard to find I am glad to see some of it still around....

[shortline10]

:DHere some more pics...:D

The gold frame in the middle pic with the axle . I have that frame also and was wonder if you know who made it ? The only place I can find a pic of it is in the Johnny Speed & Chrome ad .

[lardog]

Yes I think this is a johnnys speed & chrome frame also .. Did you see it in 3wheeling magazine march 1982 ?

[shortline10]

Yes I think this is a johnnys speed & chrome frame also .. Did you see it in 3wheeling magazine march 1982 ?

I dont have that copy of march 1982 . I believe I found it in my 1980 spring 3wheeling mag .

Is their a write up in that march 1982 mag or just the ad ?

[lardog]

There is no write up but the rear inside cover has a large ad with all the goodies from jsc....

[shortline10]

Yeah The JSC frame is a really nice frame and probably the lightest frame made . The way it was designed its different than most aftermarket frames. Its stretched about an inch in the middle section and not just at the neck and the bearing carrier sits up a little higher also so basically the frame sits different than any other rigid aftermarket frame that I have seen . Are you gonna use an aftermarket front suspension kit on any of them .

[lardog]

This frame is definately unique i think the motor sits lower than some of the other frames...front suspension is a possibility....

[shortline10]

This frame is definately unique i think the motor sits lower than some of the other frames...front suspension is a possibility....

Here is my JSC frame

[lardog]

I like it .... I need to get my jsc bike done soon....

[Vealmonkey]

Ok, now you have me. What is a complete pauter kit? What must I do to try and obtain one of these complete pauter kits? I don't have a pauter kit, but I have a much lighter frame than that though.

[shortline10]

These are rare? I thought they were common because I have 10 complete pauter kits on my shelf still in the box.

I think he's trying to get 10 goats in his barn :crazy:LOL

[shortline10]

These are rare? I thought they were common because I have 10 complete pauter kits on my shelf still in the box.

Got me confused is it Honda??? :banned: / :lock: or Shorty OOOPS I wont tell :postwhore

[lardog]

NOS? NIB? Pauter Kit... WE WANNA SEE PICS :wondering

[Escanabajosh]

I dont have that copy of march 1982 . I believe I found it in my 1980 spring 3wheeling mag .

Is their a write up in that march 1982 mag or just the ad ?

them are some nice old bikes yas guys got, but i just cant get over how many people have magazines that are older then me and they still ready them,lol, i wish i had some. i always say i wish i would have been born ten years earlier (1973 instead of 1983)

[Bryan Raffa]

You guys are nuts.. with these...:naughty:

[shortline10]

NOS? NIB? Pauter Kit... WE WANNA SEE PICS :wondering

If you want to see a NOS pauter 61mm cylinder kit I have one and can post pics after work .

[shortline10]

This is a NOS 61mm Pauter Piston / Alum Cylinder Kit with a venolia race piston for a atc90 . Notice piston is already cut for their stroker crank set up .

[lardog]

Very Nice ......

[Dirtcrasher]

Maybe this is is silly question...............

Shortline, what made you buy so many of these parts and hang on to them? Did you buy someone out or get a great package deal?

I'm just amazed at the volume of parts that you have and I bet you haven't even scratched the surface with the pics you've shared!! :D

Regardless, NICE STUFF GUYS!!

[Shorty]

This is a NOS 61mm Pauter Piston / Alum Cylinder Kit with a venolia race piston for a atc90 . Notice piston is already cut for their stroker crank set up .

Do you want to sell it?

[shortline10]

Maybe this is is silly question...............

Shortline, what made you buy so many of these parts and hang on to them? Did you buy someone out or get a great package deal?

I'm just amazed at the volume of parts that you have and I bet you haven't even scratched the surface with the pics you've shared!! :D

Regardless, NICE STUFF GUYS!!


Years of collecting knowing this stuff is none existent after the 80s so if your into the hobby you have to horde it LOL

[greenhuman]

This is a NOS 61mm Pauter Piston / Alum Cylinder Kit with a venolia race piston for a atc90 . Notice piston is already cut for their stroker crank set up .

That's the pump fuel piston. I used to run their methonal piston with the 61mm crank. I believe they were 14-1 compression.
Pauter changed the design of their balance holes in their 61's toward the end to a stepped hole instead of parallel because they used to form a crack from the balance hole to the crank pin which used to make the pin come loose.
I may have mentioned it before. I went to Pauter Machine in May 1982 and could have purchased their stroker jigs and numerous big valved heads etc but everyone including me was in love with the new 250R's and was thinking this stuff was old hat. DOH!

[shortline10]

That's the pump fuel piston. I used to run their methonal piston with the 61mm crank. I believe they were 14-1 compression.
Pauter changed the design of their balance holes in their 61's toward the end to a stepped hole instead of parallel because they used to form a crack from the balance hole to the crank pin which used to make the pin come loose.
I may have mentioned it before. I went to Pauter Machine in May 1982 and could have purchased their stroker jigs and numerous big valved heads etc but everyone including me was in love with the new 250R's and was thinking this stuff was old hat. DOH!

Very interesting thanks for the info .

I have one of pauters 61mm crazy alcohol venolia pistons / cylinder in one of my 90's but I rejeted it for 110VP race fuel . Its scary when cranking that puppy up and the crank case pressures are just ridiculous . LOL .

[90crazy]

Here's my pauter...:lock:

[shortline10]

Here's my pauter...:lock:

Very nice . How does it run ? I like the BAPP stinger exhaust it looks in really nice shape .

[Dirtcrasher]

I have that dam clutch cover, or something similar - I'm gonna email Shortline and see what it is :lol:

Clutch bracket on side, hole for kicker (had a kicker in it but broken off)

NICE KIT!!

[motoman1012002]

that is sweet

[90crazy]

I have'nt even threw a leg over this thing yet! Just bought it! The guy claims it runs great and it rips! That BAAP stinger is in great shape! What I thought was funny is the stock air box.

[Shorty]

Did you buy that from a guy in CA?

[shortline10]

Lots of nice parts on their . That bapp chain tensioner is the HD model and a rare piece . What does that intake manifold say on it ?

[90crazy]

Lots of nice parts on their . That bapp chain tensioner is the HD model and a rare piece . What does that intake manifold say on it ?
The manifold says HLM. The old owner said it was Honda of Lemon Grove.

[90crazy]

Its time to start buildin motors!:naughty:

[shortline10]

Its time to start buildin motors!:naughty:

I think your living up to your user name :naughty:
Nice pile of cylinders:) .
Now start looking for the pistons LOL

[lardog]

Nice cylinders where did you find em??

[Mr_RPM]

i got a ?
whats up with the large dipsticks?
whats the point?

[shortline10]

i got a ?
whats up with the large dipsticks?
whats the point?

Those are vented dipsticks to relieve the extra pressures of a built up motor .

[Xpress]

Its time to start buildin motors!:naughty:

Hey....

You got some nice cylinders there... :naughty:

[Vealmonkey]

I just recently picked up one of those venolia alcohol pistons that take the cb750 rings as well. I have got to get my other projects going and get me an alcohol engine together. Been talking to a person or 2 and updating my notebook. Steel recoil cable and a reinforced starter is a must. Oil coolers, vented dipsticks and bearing cam all in the goodie box. Are we talking hardtail frames or suspension frames here? Sounds like a shootout coming up! LOL Of course if this will be considered an unlimited class, I have a few "new" ideas for that as well. Will we be just going in a straight line, or are we looking at doing circles? It's been a while since I've done circles. I wish I had my camera here. I got some goodies to get some pictures of. Oh, and I have a line on a new hardtail frame that I don't think I've seen on here before. Not sure if it's lower than my nicholson or not.

[Mr_RPM]

at what point is a vented dip stick needed? what are some symptoms a built engine makes to indicate a vented dip stick is needed? what type of displacement cause's those types of pressures on these 90/110s

[90crazy]

I just recently picked up one of those venolia alcohol pistons that take the cb750 rings as well. I have got to get my other projects going and get me an alcohol engine together. Been talking to a person or 2 and updating my notebook. Steel recoil cable and a reinforced starter is a must. Oil coolers, vented dipsticks and bearing cam all in the goodie box. Are we talking hardtail frames or suspension frames here? Sounds like a shootout coming up! LOL Of course if this will be considered an unlimited class, I have a few "new" ideas for that as well. Will we be just going in a straight line, or are we looking at doing circles? It's been a while since I've done circles. I wish I had my camera here. I got some goodies to get some pictures of. Oh, and I have a line on a new hardtail frame that I don't think I've seen on here before. Not sure if it's lower than my nicholson or not.
I'm thinkin TT flat track!:naughty: BTW, if you pass that frame up let me know!:D

[90crazy]

I think your living up to your user name :naughty:
Nice pile of cylinders:) .
Now start looking for the pistons LOL
Ok, lets start here.... I need pistons! Anyone have any for sale?

[Vealmonkey]

Blown base gaskets and oil shooting out of your dipstick and vents are good indicators you need a vented dipstick! LOL I've even seen a plastic dipstick launched out of it hole before! Several factors contribute to high crankcase pressure in a 90. Large compression, stroker crank and higher rpms. You engine has vents for everything pretty much stock, but when you start messing everything around on the inside, it's best to vent. And high crankcase pressures will make your engine run screwy as well. But there's lots more tricks than just dipstick breathers and venting your rocker cover.

[90crazy]

Nice cylinders where did you find em??
Here on the site. I picked up one of those headlight gaurds like you have too! I was wondering when I'd stumble on one... That thing looks great on yours!

[Vealmonkey]

90 crazy, what kind of pistons?????

[Vealmonkey]

That frame won't be passed up, I just have to get it, but I do know where another Hi Performance suspension frame is though, pretty complete too. But you gotta open the wallet up some. I had to pass on this frame, but there are other big things happening!!!!!!!

[90crazy]

90 crazy, what kind of pistons?????
:lol:I don't know, just good high compression pistons that'd work good with a big stroker. Mike, what do I need?!?!:lol:

[90crazy]

That frame won't be passed up, I just have to get it, but I do know where another Hi Performance suspension frame is though, pretty complete too. But you gotta open the wallet up some. I had to pass on this frame, but there are other big things happening!!!!!!!
I won't go there:rolleyes:

[Vealmonkey]

Well, if you are going big bore and have a rod that takes the bigger wrist pins, cb750 piston is pretty much the easiest to find. Then it's just a matter of what size and compression you are looking for. Most times, they are sold in sets of 4 though. LOL

[Vealmonkey]

Also I'm in a discussion right now about running a kicker for the alcohol piston, at least to get it started the first time.

[Mr_RPM]

hmmm well my engine seems pretty mild compared to most of you guys here, i just got my engine together today and was thinking about running a mini filter on the crank breather instead of all the hose (since im no longer running an air box) hopefully i wont have any problems with excess pressure, im not to worried about it. only went 4mm over and at supposedly 10.5:1 according to the piston kit, will have to do a compression test once i get it all broken in.

EDIT- speaking of which, what do you guys do with your heads on these huge engines? how do the ports look? we did quite a bit of porting and made everything quite a bit bigger. anyone have some pictures to see?

[Vealmonkey]

Everyone has their porting tricks or their "head" guy has thier porting tricks depending on your riding style and cam and alot of other factors. But if you are using a stock carb, I personally would not have done any more than a simple match porting (blueprinting) of your intake side with some polishing on the intake and exhaust. If you opened your exhaust port up and you are pretty much stock, not good. You will be lucky if that trike runs at all. If your bike runs like crap, go back to a stock un modded head and just do the match porting and some polishing. If you were running an aftermarket intake and bigger carb and cam, then my recommendations would be slightly different. But I can tell you that you are better off running with a restricted stock head than an overported mistake. There were and are reasons why people pay these guys lots of money. Years of experience and flowbenches for two. I would rather leave the real mods up to the people who have done this for awhile. I know when to involve others with way more experience and skill than me. There's nothing worse than trashing perfectly good parts. But the whole object is to have fun. Not trying to give you a hard time, I just don't want to see you waste time and money and be frustrated.

[lardog]

Here on the site. I picked up one of those headlight gaurds like you have too! I was wondering when I'd stumble on one... That thing looks great on yours!

Awesome...

[Mr_RPM]

yeah i completely understand. i went with a 24mm carb with a direct bolt on UNI filter and a Powroll intake. went with a toko rocky cam (dont know much about, shortline would as he sold it to me) and im using a DG pipe. we didnt go to extreme with the porting and hopefully it all works out. we went for a high end rpm power. my dad knows what hes doing, im just the noob. but as a modern motorcycle mechanic he doesn't do alot of porting as todays machines don't need it and because he doesn't build full out race engines. But we both fully understand the theory of it all just this is my (and somewhat his) first time going this far on an engine. usually a pipe, piston, cam and some intake mods is all u need to wake up a 450 or other new type of machine these days. But im not one to speak for him and he could know way more then i think he does. sometimes im surprised and other times not so much. we will see how it all goes. in the back of my mind im fully prepared to tear it apart again and go back to some new oem parts. experimentation is all a part of fun and learning.

[shortline10]

The pistons are def the hard piece to find . A nice venolia is great if you can find one but a cb750 1969-76 oem piston can be machined to work as well



:lol:I don't know, just good high compression pistons that'd work good with a big stroker. Mike, what do I need?!?!:lol:

[shortline10]

Pictures of a OEM 61mm Honda cb750 piston , set up for a big bore atc110 application . Mods done are skirt cut for stroker application , top of piston has been decked for correct height and then the valve reliefs cut in . The piston started out life as a flat top :naughty: .

[Vealmonkey]

Alot of love went into that piston there. I've always wondered if it would make the old 90s run better if you used some of todays modern piston coatings on those old pistons?

[90crazy]

Just thought this thread was a good spot for this pic.:cool:

[motoman1012002]

So the black cylinder looks stock bore out and a sleve put in is that what it is crazy

[shortline10]

Yep thats what you call a cheater cylinder LOL . Stock looking on the outside but a beast inside .

[motoman1012002]

gonna be looking into this

[dckinsella]

I have some of the parts you fellas are talking about... I have a 1977 90cc with a BAPP Big Bore Kit and literally modifications from top to bottom. Custom handlebars, a Hurst Airheart disk brake, SuperTrapp pipe, 3D Fender, BAPP parts galore!. Extra pistons, chains (new), cams, carbs... Email me anytime for pics, I am thinking of selling out...dckinsella@yahoo.com

Thanks,
Dave

[90crazy]

Just picked up a motor that had this 61mm starburst with spacer plate.

[90crazy]

This crank is definately the largest I've came across. It was matched up to the 61.5 bore H&S starburst with a 6.5mm spacer plate. You can see how much of the cases are bored just to fit the crank!:naughty: I know I've seen these cranks in an old H&S ad. If my measurements are correct, this is 199cc monster! :cool: Is this possible?:wondering

[motoman1012002]

wassnt the crank from a sl or xl bike I was looking throw some old 3wheeling mags

[vartiak15]

dang is this the helm stroker we were talkin about? that thing is huge!

[greenhuman]

It can be done to a 110 crank as they are a few mill bigger in diameter than a 90 crank.

[90crazy]

Here ya go Mike. This shaft for this monster motor is machined down a long ways to clear that crank!

[shortline10]

I bet its a close fit even at that LOL .