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pgilles
05-27-2007, 08:35 PM
i used to own an '84 big red and had to sell it last summer because i needed the money. it was alot of fun....actually had it licensed for street use in Montana when i was going to school there!!!!

ive been searching around for another good ol' atc and stumbled on an '83 on craigslist. he had it listed as a 110 but i knew it was either a 185 or 200 from the frame....although i wasnt sure if anything had been swapped out in the last 24 years. turns out its a 185 motor on it, BUT he also gave me a spare motor he had laying around...which is a 200.

so, as it sits at the moment the 185 motor is in the trike and runs really well. i started to pull apart the 200 motor today to find out what, if anything, is wrong. well, its not seized and everything looks to be in good shape...all it needs is a cam chain as that was broken.

so to get to my questions....what seperates a 185 from a 200? bore? stroke? both? basically, i was hoping i might be able to pull the cylinder, piston and head off of the 200 and put it on the 185. is this a bolt on job? or am i better off fixng the 200 up and installing it?

if ive done my research correctly (not much research but a little so far), it seems the 185 and 200 are the same head??? that got me thinking the stroke is what seperates the two.

future plans for the new toy: its just some wheels to get me to the ice shack in early winter, play around at the cabin on the trails/land, but no real hardcore riding. im thinking i want to do a port job, 200x cam, 24mm carb, exhaust and intake.

sorry for the long post but i figured i better give you more than enough info. i appreciate the help and let me know where im wrong and what else you may need to know...

Pat

bigreddaddy
05-28-2007, 12:16 AM
Why do you want to run the 200 or switch heads? The only real differences in power between the 185 and 200 ATC's are the gearing (sprockets).

bigreddaddy
05-28-2007, 01:08 AM
By the way, the stroke is the same. The bore is obviously different.

Jarrod
05-28-2007, 01:32 AM
this really doesn't have anything to do with your trike...
but reading your post brought back some memories of swapping out a couple of 185s engines into 200x frames a couple of decades ago....LOL

dickieg89
05-28-2007, 11:10 AM
I don't have any input here, I just want to know how you had it licensed for street use in Montana?

pgilles
05-28-2007, 01:30 PM
Why do you want to run the 200 or switch heads? The only real differences in power between the 185 and 200 ATC's are the gearing (sprockets).

if they are close enough in power than im not going to worry about it. i was thinking about the old adage 'no replacement for displacement' and figured if the stroke was the same i could swap the cylinder, pistion and head on the existing 185 motor to make it a 200. if the power difference is negligible than i wont go through the hassle.

anybody looking for a 200 motor??? :)


I don't have any input here, I just want to know how you had it licensed for street use in Montana?

all it had to do was pass a page long list of requirements in front of a licensed officer and get their signature.....brake lights, ability to go 35mph, front and rear brakes, parking brake, etc etc. it sat in the back of my truck as he was checking off the requirements. he owned a big red before and said 'oh, i know these things can go atleast 35' haha. i was really surprised i could, but i didnt question it!! i got my license and drove as much as i could with that thing!! haha it was great! i drove it to class everyday and got many looks. i love Montana!!!!!!

3Wheelers4Life
05-28-2007, 08:54 PM
here is the specs for the 185 and 200
..........................................ATC 185...................................... ATC 200
Bore.........................................63mm. ......................................65.5mm
Stroke......................................57.8mm ....................................57.8mm
Displacement...........................180.2cc.... .................................192.0cc
Compression ratio....................8.0:1.................... ....................7.8:1
Maximum horsepower..............13.0 bhp @7000 rpm...............13.0 bhp @ 7000 rpm
Standard bore..........................63 - 63.01 mm .........................65 - 65.1 mm

the 200 has more torque thats cool that you got a 3 wheeler street legal.