ATC 110 build

[1979atc]

I have a 1985 ATC 125M and frame with my 1984 Atc 110 forks and plastic. I am putting my 1979 Atc 110 motor with my H&S cylinder on the frame. It would be better with an aftermarket frame, but I don't have the money to spend on one of those right now, maybe one of these days. I plan on making a Dickson joker or Sprint frame at school in welding class one of these days. I'm not a big fan of the chain tensioners, I have a BAPP chain tensioner but I have it on another bike right now. These aftermarket parts are also going on this build, BAPP breather dipstick, sudco intake manifold, oversized carb. 225770225771
I have also been working on these cases for another bike I have, with a 123cc piston kit.225772225773
Sorry about the side ways pictures I can't get them to rotate.

[Joseph Farrow]

Cases look good. I know that was a lot of work.
I have found that if you use pic's from your phone you have to rotate them on the phone before you down load them onto the site.

[1979atc]

Yes thank you I'll keep that in mind, and the cases have a lot more to go a lot of wet sanding and polishing.

[effort=results]

Very nice. Ive got the 125cc rocky piston. Shortline10 hooked me up with race cam. Flat track rears.Ported head cobra exhaust and stock carb jetted out. Thd carb is next for an upgrade. WhaT carb u have planned. This is a vid of my girl on her first speed runs.


https://youtu.be/_kuEV15I-mg

[1979atc]

I've been running xr 100 carb, on my sudco intake on my stock 90 with pipe and stuff, On this build im going to get a aftermarket xr 100 carb or another stock one. And I commented on your video, im Allen Bingle on youtube. After its done I will put videos on my channel of it.

[RUNMEDOWN]

Dr. ATV has a lot of parts for the 110-125. The 85 ATC110 is still my favorite of all of mine. Just never quits. Great little trike.

[1979atc]

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Few more pictures of the build with all the plastics and tank on. And will be getting a new seat cover.

[1979atc]

Got my motor apart and it was a bent exhaust valve. I had a head that was ported and I decided to use it because the one that was on it had some issues. Had stock valves with aftermarket springs and retainers. While taking the head off the cylinder didn't crack loose while disassemble. So I didn't touch so I didn't disturb the rings. Everything came out great. It had a copper head gasket that was cut down. I did some looking and found one that was the same size. Only problem I have is that it leaks a little oil on the right side of the head gasket, it's not a bad leak more of a seeping leak lol. I will take it back apart sometime. I would like to do a hi lo range cut out mod or find a case that is already done and some other mods. Then I would take head off and do a big rebuild, when I get the money to do it. But I got it back together and the thing rips and runs really good. I will post more pics of the motor in trike later.226615226616226618

[Ol Deuce]

Looking great!! Love the polish job!!! ya want to do mine ?????

[1979atc]

Lol I would but I would be 80 by the time it got done! And I was looking at my head that I swapped and I think I know why it's seeping oil, the one had 2 copper gaskets on it that were perfectly lined up with eachother, I only used the one I had didn't know that it had 2, all well ill have to take it back apart someday to do more things to it. Thanks for the input!

[1979atc]

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Got some wheel spacers for the rear, did some riding on my oval track last night and it performed really good. How does it look? Motor has been running great and the plug is showing very good signs that it's running how it's supposed to. Not running rich or to lean, just right. Been gathering parts for my next build, 1980 Atc 110 with 123cc big bore kit. Will be doing a hi/lo gear box elimination. Will be getting sl 90 counter shaft soon, and have a tranny, carb, and stage 1 cam on its way. Mods to my next build will have 123cc kit, stage 1 cam, sudco intake and oversized carb, hi/lo gear box elimination, BAPP crankcase breather, and plan on getting 4" rear wheel spacers. Will keep this thread posted on the next build. Thanks

[Ol Deuce]

227751
Got some wheel spacers for the rear, did some riding on my oval track last night and it performed really good. How does it look? Motor has been running great and the plug is showing very good signs that it's running how it's supposed to. Not running rich or to lean, just right. Been gathering parts for my next build, 1980 Atc 110 with 123cc big bore kit. Will be doing a hi/lo gear box elimination. Will be getting sl 90 counter shaft soon, and have a tranny, carb, and stage 1 cam on its way. Mods to my next build will have 123cc kit, stage 1 cam, sudco intake and oversized carb, hi/lo gear box elimination, BAPP crankcase breather, and plan on getting 4" rear wheel spacers. Will keep this thread posted on the next build. Thanks

It is looking wide !! to cool

[1979atc]

I'm looking for a Big Al's Atc 110 allenhead engine case bolt kit. Could anyone help me out?

[John Tice]

Looks like your head spacing is too tight. It appears that your piston is smacking the head. A dab of play dough on the head will give you spacing amounts.

John Tice
503-593-2908 Alternate 541-508-3944
www.smallenginemachineworks.com & www.nwsleeve.com
Turning Custom Cylinder Sleeves Since 1971

[Joseph Farrow]

Good luck finding a 90-110 BAPP allen head set.

Here is a good set that is also stainless.

http://www.ebay.com/itm/Stainless-Steel-Engine-Bolt-Set-ATC90-K0-3-76-78-NGSS-27-/321980754953?hash=item4af78c6c09:i:321980754953&vxp=mtr

[1979atc]

Thank you Joseph, I found a set of BAPP ones but I may go with your find because they are a little bit cheaper than the BAPP set.

[Jwheeler]

I have some !

[1979atc]

The bolt set will be used on the motor that has the polished cases. I'm still gathering parts for it. I will be using plastic fenders that are in really nice condition no cracks. I have a tank but it needs redone. So I will be using my tank off of my 77 90 for now. Pm sent to you Jwheeler.

[1979atc]

I have some more parts coming and I got this modification started today. Yesterday my stage 1 cam arrived, and I have a sl 90 counter shaft coming. What you guys think of the case?
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[Daddio]

Looks good to me. I have a case that I cut down like that. I just need to find the right cylinder so I can get mine put together.

[Joseph Farrow]

I have some more parts coming and I got this modification started today. Yesterday my stage 1 cam arrived, and I have a sl 90 counter shaft coming. What you guys think of the case?
228170

Looks Good. All you need to do is just a little finishing on it and you'll be good to go. You can fill the holes with two part expoxy. I use a belt sander to smooth everything up.
I am the master at removing the Hi/Low gear box. lol

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[Joseph Farrow]

Another thing you will need a different seal for the SL counter shaft. The one for the Hi/Lo will not work. I think the correct seal is the same one used in a CR250 IIRC.

I think this is the one you need.
http://www.ebay.com/itm/Nos-NOK-AE1021P-91201-459-003-Oil-countershaft-etc-SEAL-20x37x7-8-Flanged-1ea-/161794689842?hash=item25abb70b32:g:dAwAAOSwMmBVzod y&vxp=mtr

[1979atc]

Ok thanks for the information Joseph, I will get one coming.

[1979atc]

My counter shaft and case bolts came today. Is this the right shaft? And it has 23 teeth on the gear. Thanks
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[1979atc]

I did some test fitting to see if the shaft and everything worked. It did, now I'm waiting on my counter shaft seal for the sl90 shaft. And then the bottom end will be ready to got together. Had some bearings for my crank and transmission shafts so I'm all good to go. My piston rings should be coming here sometime. Then I need to get new wrist pin clips then we're all good.

[Joseph Farrow]

Shaft looks right. Just transfer all the gears from the standard 90/110 with hi/lo over to the sl shaft.
Pick up a clip from the local hardware store to hold the sprocket on and you'll be good to go.

[1979atc]

Do you think I should get other sprockets? I have one and it's a 11 tooth. I have a clip set should have one that works, and swapped gears to sl shaft and everything worked out. I will be putting bottom end together when my shaft seal comes. Thanks for the help.

[Joseph Farrow]

I am pretty sure you can install the seal from the out side if you want to go ahead and put your cases together.
Also the front sprocket all depends on your rear sprocket rear tire size and engine mods. A good middle of the road front is a 13-14 tooth. Smaller the front equals more low end bigger the front equals more top.

[1979atc]

Ok thanks I will see if I have other sprockets somewhere. Today must be my lucky day, my seal and my rings came today, only thing I need is a shifter shaft seal. Turned out that one was bad and those are common to leak when worn. I will be ordering one of those. But I can still put the bottom end together, I need a head and I have a 90 motor that needs a lot of work, could I use the head off of it?? I plan on porting it anyway I just didn't know if they were the same as a 110 or not. Thanks

[shortline10]

81-84 250r sprocket seal works perfect as well



Another thing you will need a different seal for the SL counter shaft. The one for the Hi/Lo will not work. I think the correct seal is the same one used in a CR250 IIRC.

I think this is the one you need.
http://www.ebay.com/itm/Nos-NOK-AE1021P-91201-459-003-Oil-countershaft-etc-SEAL-20x37x7-8-Flanged-1ea-/161794689842?hash=item25abb70b32:g:dAwAAOSwMmBVzod y&vxp=mtr

[1979atc]

Today I did some more work, got case oil holes filled last night and did some sanding to smooth everything off. Got my seal put in my case half, and I have to get my doner 90 motor tore apart plan on using head and I have to get shifter shaft and keeper out. Other than that I got the crank put it and the transmission together. Donor is at my grandfathers, so I will get it about Tuesday when I go out there. Going together pretty well so far hopefully have it running in the next month or so. Still have to get chain, would like to find more flat track tires, have three bolt rims for them but I need to get those sand blasted and the old tires need takin off. Have a NOS wamulass front tire for the build also. Still need to get a carb and another sudco intake. And I have a Big Al's pipe and stinger to go on this build.

If I decide to paint it sometime I'm thinking about going with a old spray bombed blue my dad used on one of his race 90s he had back in the day, wish he never sold it. It had a Chrome Big Al's pipe like the one I'm using on this build, but only chrome. And had a 108cc kit with stage 2 cam and oversized carb. My father had his friend race it in the 200 class, wouldn't let him be in the 110 class, and he started dead last and finished 3rd. I may have to put a picture on here of the three wheeler, I saw it at my grandfather's not to long ago. Hopefully this build turns out good I love these 90/110s. Thanks
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[effort=results]

Awesome! 6a the flat track tires are just awesome looking on thes lil machines.

[1979atc]

Awesome! 6a the flat track tires are just awesome looking on thes lil machines.

Yeah they are I think they look and handle great. I tore apart my doner motor and got my shifter shaft and keeper out. This motor is horrible I have it sitting vertically right now with brake fluid down the cylinder to loosen up the piston. The head was good shape, so I am able to use it just need to get the valves tore out of it, and port it. Lap the valves and clean up everything then ill be good to go. Bottom end is half way together right now, hopefully be together soon.

[Joseph Farrow]

Post pics of the old race bikes!

[1979atc]

The side cover is just slid on there for now I'm waiting on my shifter shaft seal. Transmission shifts and works well. How does the case side look? Thanks
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[1979atc]

How about some old pics!! Sorry quality is a little bad. I will get pics of the old race trike, was to dark to take a picture tonight, it's in the barn.
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[Joseph Farrow]

How about some old pics!! Sorry quality is a little bad. I will get pics of the old race trike, was to dark to take a picture tonight, it's in the barn.
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Good Stuff! Those were the days. Grass Roots Racing!!!

[1979atc]

I wish it was still those days, I would at least want to race mine once. I have an oval track but only race my brother on it sometimes, anyone know where they race like 70s and 90/110s anymore? Or do they not do it at all anymore, thanks for the input everyone!

[200X FT]

Daddio would be the one to ask about the 70 racing around Coshocton. I know a couple places that'll run whatever as long as there's five of them. I'd love to get a group of 90/110's together for some fun. I know Sunset Ramblers in Galion ran a trike class when enough people showed up. I also know a couple other places that would run them too

[Daddio]

There are a few small tracks around here but most of the guys are either racing stock cars or dragracing during the summer. We do manage to get a few races in every year though. If you are on Facebook try this link. It's to the O.T.C., Ohio Trike Crew. They have the scoop on trike racing in Ohio.
https://www.facebook.com/groups/204287109654337/

[1979atc]

Maybe I'll have to look into it, kinda a shame all the tracks around me disappeared. My dad is a close friend of the person who owns Fremont Speedway a sprint car track, pictures I posted of the racing is the track. They had that track in the infield, maybe I could do some talking someday and see if they would try to get something put together. Just have to find people to come and race!

[1979atc]

I have ran into a problem, my 123cc piston I was told was a 123cc I am pretty sure it is a 118cc piston. My rings I got that were 123cc are to big and the top ring will not even fit in top piston slot. Does anyone have rings for 118cc kit for Atc 110. All I need is the rings not the whole kit. I see kits on ebay ,but no rings. Please let me know ASAP, I need rings! Thanks

[Jmoozy27]

What is the measurement on the piston?

[1979atc]

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This is what I have on the caliper, but i am not real sure how to read it. But I think the piston is a 118cc. All input is appreciated, I'm learning a lot of you have more knowledge on this type of stuff thank you!

[HappyTrail]

228592228593
This is what I have on the caliper, but i am not real sure how to read it. But I think the piston is a 118cc. All input is appreciated, I'm learning a lot of you have more knowledge on this type of stuff thank you!

228607
Looks like a +5 90/108 piston. The 90 has a 14mm wrist pin, the 110 is 15mm. The piston on the leftt is a 110/123.

[1979atc]

The piston I have is a 15mm wrist pin, did some comparing with pistons my dad has and we figure that it may be a 118 piston. Thanks

[1979atc]

Here is what the build looks like so far, I had a BAPP 55 tooth rear sprocket and a BAPP chain tensioner I put on today. I just have the motor sitting in the frame until I can find a 123 piston for a good price, or just be able to find rings for a 118cc piston. That would save me from boring the cylinder also. My 3 bolt rims I will be getting sand blasted, and put flat tracks on the rear, instead of having these big knobby tires on the rear.
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[1979atc]

Have a few more things to add, lightened flywheel, (not finished yet) and got a BAPP intake manifold, I am putting the BAPP intake on my H&S trike, will be putting a sudco on this current build.
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[1979atc]

Here are some pictures of my first build H&S trike, and I recently just put on a BAPP long intake on. My other build that is going to 123cc is currently still down, still waiting for some parts, got a web 99 cam, 123cc piston and 3in vintage wheel spacers coming for it. Thanks
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[ironchop]

You got some pretty sweet stuff on there. Nice rides too.

Sent from my Z998 using Tapatalk

[1979atc]

Another update. I have been in the process of making fork extenders. I just got a set finished and have installed them. I like the look and it handles a lot better. 229873

[1979atc]

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Here are some pictures of my piston, can anyone identify the brand of the piston. The cc is unknown at the moment. Pictures show all the symbols on the piston. Thanks

[shortline10]

Looks like a PK piston that's been stroker cut to me :)

[1979atc]

Thanks Mike! Sent measurements to Jwheeler hope I can find out what cc this piston is so I can get rings.

[HairyJR]

Looks like a PK piston that's been stroker cut to me :)

As Mike states the original designed piston had been modified to be used in a stroker crank motor. If used expect it to knock, make louder piston noise as the normal clearance is going to be larger due to shorter piston skirts. Easy enough to measure piston size, measure across bottom of piston skirt, add @ 0.004 for clearance and convert to millimeter.

[1979atc]

Here are some goodies! Anyone recognize what in the left hand bottom corner? :naughty:231130

[shortline10]

Yep it replaces the points set up , cool old school parts !

[1979atc]

Yep it replaces the points set up , cool old school parts !

I seen only one other one and you posted it Mike. Wish I could take all this stuff off my Fathers hands! More to come when we find his other stash!

[shortline10]

Well if you want one for your self LMK lol I have no plans for the one I have :)



I seen only one other one and you posted it Mike. Wish I could take all this stuff off my Fathers hands! More to come when we find his other stash!

[1979atc]

Been wanting to share this with some of you for awhile, and today I could finally get a picture of it in the daylight. My father's old modified race bike, it all needs put back together. This is a fully suspended bike, This thing is very wide, wider than legal limit I was told. The motor that goes in this is a stroked 210cc 185s motor. Huge stage 2 cam, 32mm carb I believe went on it. Had a supertrapp full exhaust system and a lot of other goodies. He still has all the old parts that went on it. Packed in our several barns of parts, lol. We plan on restoring this bike someday, or get it all back togther and running again. Has been part for awhile now, ever since I can remember and I'm 17 now. Thanks!
231181

[1979atc]

Been wanting to share this with some of you for awhile, and today I could finally get a picture of it in the daylight. My father's old modified race bike, it all needs put back together. This is a fully suspended bike, This thing is very wide, wider than legal limit I was told. The motor that goes in this is a stroked 210cc 185s motor. Huge stage 2 cam, 32mm carb I believe went on it. Had a supertrapp full exhaust system and a lot of other goodies. He still has all the old parts that went on it. Packed in our several barns of parts, lol. We plan on restoring this bike someday, or get it all back togther and running again. Has been part for awhile now, ever since I can remember and I'm 17 now. Thanks!
231181
My father told me it has been apart since about later 1980s, what is also really neat about this bike is he said he raced it in the SilverDome in the early 80s with Mickey Dunlap. Just if we got enough space, we could drag it out and start rebuilding it.

[1979atc]

Ok back to the 110 build! The first 110 on this thread I decided to upgrade the carb setup. I was first running a 19 mm carb. Now I'm running a 27mm carb! Now it really breaths! Lol. Next I will be redoing the whole clutch pack. Brand new everything, clutch friction plates, metal plates, and springs.
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[1979atc]

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Second Atc 110 build motor almost done. 118cc high compression piston, web 99 cam, hi lo elimination, BAPP dipstick, lightened flywheel, Sudco intake, bigger carb.

[1979atc]

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The second Atc 110 build so far, what does everyone think of it? Thank you.

(Don't mind the attached thumb nail picture of tank, clicked on that picture on accident)

[1979atc]

I need a little help. On my second 110 build I'm having a little trouble with the head gasket sealing. I used copper gasket sealer and is still not sealing correctly. I can't seem to figure out why it keeps leaking. When it's running its blowing oil out and bubbling out at the same time. I have never had this happen before and have built several motors with no problem. Anyone have suggestions how to get it to seal? Thanks

[greenhuman]

Did you put a new rubber seal in? The circular one that goes around the lower left stud dowel between the head and cylinder.

[1979atc]

Did you put a new rubber seal in? The circular one that goes around the lower left stud dowel between the head and cylinder.

Yes, the rubber seal was in there and it was new. I always double check myself putting that seal in. Lol I used every gasket that came in the top end gaskit kit also.