Planet Minis

mach780lover · 03-28-2009, 11:58 AM

Ok, first off, im new to the site. I couldnt find any other sites that could give me the information i was looking for. I tried atvconnectionforums.com, as well as 3wheelerworld.org, with no luck.

i have a 1980 honda atc 110. i am rebuilding the motor as we speak, and would like to do some upgrades. i am having the head ported mildly, as well as the intake. i am adding a 24mm carb and a free flowing exhaust, not sure what brand yet. i would like to install an inner rotor kit, but i havent found any information telling whether or not an inner rotor kit for a honda 50, a pit bike or whatever else will fit. is the crank taper the same? how about crank lenght, stator cover clearance and mounting,etc. i cant be the first one to try this, so someone must know something about this. any info is appreciated. thanks in advance guys.

s_10onbagz · 03-28-2009, 02:30 PM

I don't know much about those motors, but maybe firepower will chime in.

I know they have a different case design than the 50/70 motors, but I want to say the top ends are interchangeable. Try DRATV.com, he has a bunch of parts for the 90/110 motors. I would find a high compression piston or the motor will still be a dog.

mach780lover · 03-28-2009, 05:00 PM

what about the inner rotor kit. will it fit the crank, clear the cases, etc.? i think it would be a great upgrade. any insite? thanks in advacne.

dirtbkr188 · 03-28-2009, 06:06 PM

I really don't think the top ends are interchangable at all, the cam chains are different lengths, the cam sprocket for the ATC has 30 teeth, making the cam drive sprocket 15 teeth, the cam on the ATC also drives the points contact. The ATC piston takes a 15mm wrist pin, and the ATC gaskets are a totally different configuration than the 50/70 ones.
It appears in the microfiche that certain year ATCs had an inner rotor style ignition system, as shown below. You would need to reference a service manual for more information.

firepower354 · 03-28-2009, 07:49 PM

Apples & aardvarks. Call the Dr.

4X4 AG · 04-03-2009, 10:17 AM

So I am guessing that this will be the same if I am messing with a TRX 125?

I don't think the Dr. shows anything for those though?

doopsx3 · 04-03-2009, 10:19 AM

I think u r right...but they have 90/110 Honda stuff...so a cam may work...IDK...could have an issue with how the CDI mounts?????

4X4 AG · 04-03-2009, 10:22 AM

Quote:

Originally Posted by doopsx3

I think u r right...but they have 90/110 Honda stuff...so a cam may work...IDK...could have an issue with how the CDI mounts?????

Yah, and i was really looking for a big bore kit or a high compression piston.

doopsx3 · 04-03-2009, 10:33 AM

check'em out..I think they may have hi-comp slugs...for 110 or 90

03-28-2009, 11:58 AM	#1 (permalink)
mach780lover PM Newbie Join Date: Mar 2009 Posts: 2	It's not a 70, but its an atc. ATC 110 mod's. Ok, first off, im new to the site. I couldnt find any other sites that could give me the information i was looking for. I tried atvconnectionforums.com, as well as 3wheelerworld.org, with no luck. i have a 1980 honda atc 110. i am rebuilding the motor as we speak, and would like to do some upgrades. i am having the head ported mildly, as well as the intake. i am adding a 24mm carb and a free flowing exhaust, not sure what brand yet. i would like to install an inner rotor kit, but i havent found any information telling whether or not an inner rotor kit for a honda 50, a pit bike or whatever else will fit. is the crank taper the same? how about crank lenght, stator cover clearance and mounting,etc. i cant be the first one to try this, so someone must know something about this. any info is appreciated. thanks in advance guys.

03-28-2009, 02:30 PM	#2 (permalink)
s_10onbagz 3rd Gear Member Join Date: Sep 2007 Location: Connecticut. Posts: 1,550	Re: It's not a 70, but its an atc. ATC 110 mod's. I don't know much about those motors, but maybe firepower will chime in. I know they have a different case design than the 50/70 motors, but I want to say the top ends are interchangeable. Try DRATV.com, he has a bunch of parts for the 90/110 motors. I would find a high compression piston or the motor will still be a dog.

03-28-2009, 05:00 PM	#3 (permalink)
mach780lover PM Newbie Join Date: Mar 2009 Posts: 2	Re: It's not a 70, but its an atc. ATC 110 mod's. what about the inner rotor kit. will it fit the crank, clear the cases, etc.? i think it would be a great upgrade. any insite? thanks in advacne.

03-28-2009, 06:06 PM	#4 (permalink)
dirtbkr188 3rd Gear Member Join Date: May 2004 Location: New Jersey Posts: 2,972	Re: It's not a 70, but its an atc. ATC 110 mod's. I really don't think the top ends are interchangable at all, the cam chains are different lengths, the cam sprocket for the ATC has 30 teeth, making the cam drive sprocket 15 teeth, the cam on the ATC also drives the points contact. The ATC piston takes a 15mm wrist pin, and the ATC gaskets are a totally different configuration than the 50/70 ones. It appears in the microfiche that certain year ATCs had an inner rotor style ignition system, as shown below. You would need to reference a service manual for more information.

03-28-2009, 07:49 PM	#5 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 11,002 My Mood:	Re: It's not a 70, but its an atc. ATC 110 mod's. Apples & aardvarks. Call the Dr. __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

04-03-2009, 10:17 AM	#6 (permalink)
4X4 AG PM Newbie Join Date: Apr 2009 Posts: 4	Re: It's not a 70, but its an atc. ATC 110 mod's. So I am guessing that this will be the same if I am messing with a TRX 125? I don't think the Dr. shows anything for those though?

04-03-2009, 10:19 AM	#7 (permalink)
doopsx3 3rd Gear Member Join Date: Aug 2008 Location: San Diego Posts: 3,947 My Mood:	Re: It's not a 70, but its an atc. ATC 110 mod's. I think u r right...but they have 90/110 Honda stuff...so a cam may work...IDK...could have an issue with how the CDI mounts?????

04-03-2009, 10:33 AM	#9 (permalink)
doopsx3 3rd Gear Member Join Date: Aug 2008 Location: San Diego Posts: 3,947 My Mood:	Re: It's not a 70, but its an atc. ATC 110 mod's. check'em out..I think they may have hi-comp slugs...for 110 or 90

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)