83-85 atc 200x 70mm big bore wiseco piston kits.And 86-87 70mm piston kits.

[Shorty]

Any interest in these? Kits will contain a 70mm piston,wrist pin,cir clips, and rings. Kits will run about 175-250$ shipped need at least 8 or more people in order for them to do a run of these kits.

[NINJA]

Sleeve on an 83-85 cylinder is already paper thin in stock form. How do you expect to have enough material left after boring?

[Shorty]

Sleeve on an 83-85 cylinder is already paper thin in stock form. How do you expect to have enough material left after boring?

You have to put a whole new sleeve in the jug in order to use this piston kit.

[motoman1012002]

and the sleeve is goin to cost how much

[Shorty]

and the sleeve is goin to cost how much

Still working on that. I'm pretty sure a TLR250 sleeve will work with a little bit of moding.

[motoman1012002]

geyying into alot of money for a 200x motor most people just go up a size and find a xr cam if they going to spend that kinda of money there goin to save for a 350x

[Shorty]

geyying into alot of money for a 200x motor most people just go up a size and find a xr cam if they going to spend that kinda of money there goin to save for a 350x

Thats like asking shortline10 Why spend all that money on a little ol 90 when you can get a 200x? lol. But yeah I know what your getting at.

[shortline10]

Thats like asking shortline10 Why spend all that money on a little ol 90 when you can get a 200x? lol. But yeah I know what your getting at.

I aint spending a whole lot of money , mines in stock LOL .
Good idea but thats alot of piston for a little connecting rod .

[KASEY]

i have 2 cases of 66mm and 66.25 pistons for 200x's thats all you can go with a stock sleeve..

[Shorty]

Gosh I thought these would be going like candy. But please anyone else interested other than me?? :lol: I know I'm putting myself down for 2 kits...So I just need 6 more people to be for sure takers.

[Cuztom Racing]

We resleeve or raptor motors and its really no big deal. the sleeves are around $100. Sign me up for one of those 70mm pistons for a 86 model.

[NINJA]

You will not be able to fit a bigger sleeve in it. The stock sleeve is already only a couple mm from the cylinder stud holes. This is why Honda stroked the 200 to achieve 230cc in the CRF.

[Shorty]

We resleeve or raptor motors and its really no big deal. the sleeves are around $100. Sign me up for one of those 70mm pistons for a 86 model.

FYI

These are piston kits for the first gen 83-85 200x's ONLY. I CAN maybe do a run of 70mm pistons for the second gen 86-87 200x's if I can enough interest in those too. So if I can get 4 people for the 83-85 kits and at least 4 people for the 86-87 kits THEN I would be able to put the order in.

[Shorty]

You will not be able to fit a bigger sleeve in it. The stock sleeve is already only a couple mm from the cylinder stud holes. This is why Honda stroked the 200 to achieve 230cc in the CRF.

Haggle and Greenhuman HAS put a bigger sleeve in the 83-85 200x jug. They were running 70mm piston's too.

[KASEY]

maybe he will chime in on this... so you can see what is involved in that,, i am sure its more than just boring the cases which will have to be done also,, hmmm bigger piston ,remove the old sleeve,,, bore the cases,,, rechamber the head now you have these little valves i see a $1000 bill ,,

[Cuztom Racing]

FYI

These are piston kits for the first gen 83-85 200x's ONLY. I CAN maybe do a run of 70mm pistons for the second gen 86-87 200x's if I can enough interest in those too. So if I can get 4 people for the 83-85 kits and at least 4 people for the 86-87 kits THEN I would be able to put the order in.


Thats cool.

Whats the stock stroke on a 200x, trying to figure out what cc a 70mm piston would be.

[NINJA]

maybe he will chime in on this... so you can see what is involved in that,, i am sure its more than just boring the cases which will have to be done also,, hmmm bigger piston ,remove the old sleeve,,, bore the cases,,, rechamber the head now you have these little valves i see a $1000 bill ,,

Exactly, it's not near as simple as you think.

[Shorty]

Thats cool.

Whats the stock stroke on a 200x, trying to figure out what cc a 70mm piston would be.


He ya go. specs for the 2nd gen 86-87 atc 200x. (For what you have.)

Frame number JH3TB0529GK500001~
Engine number TB05E-6300001~
Engine type 4 stroke, Air cooled
Displacement 199cc
Bore x Stroke 65 x 60.0 mm
Compression ratio 9.5 to 1
Compression 170.5 - 199 psi
Transmission speeds 6 speed
Clutch Type Manual
Oil Capacity 1.3 Qt
Carburetion 24 mm Keihin
Starting system Kick Starter
Fuel capacity 2.78 Gal with 0.4 Gal res.
Wheelbase 47.6 in.
Overall Length 73.2 in.
Overall Width 42.5 in.
Ground Clearance 4.7 in.
Seat height 28.7 in.
Front tire 23.5 x 8 x 11
Rear tires 22 x 10 x 9
Front suspension Hydraulic Telescoping Forks
Rear suspension Mono shock
Front brake Hydraulic Disk
Rear brake Hydraulic Disk
Final drive Chain
Dry weight 278 lbs
Approx. retail new $1,848.00


And the specs for the first gen 83-85 atc 200x (for what I have)


ATC200X

Frame number JH3TB0524FK400001~
Engine number TB05E-6200001~
Engine type 4 stroke, Air cooled
Displacement 192cc
Bore x Stroke 65 x 57.8 mm
Compression ratio 9.6 to 1
Compression 142 - 170 psi
Transmission speeds 5 speed
Clutch Type Manual
Oil Capacity 1.3 Qt
Carburetion 24 mm Keihin
Starting system Kick Starter
Fuel capacity 2.56 Gal , 0.31 Gal res.
Wheelbase 47.6 in.
Overall Length 72.8 in.
Overall Width 41.3 in.
Ground Clearance 4.9 in.
Seat height 27.8 in.
Front tire 23.5 x 8 x 11
Rear tires 22 x 11 x 8
Front suspension Hydraulic Telescoping Forks
Rear suspension Mono shock
Front brake Hydraulic Disk
Rear brake Hydraulic Disk
Final drive Chain
Dry weight 282.2 lbs
Approx. retail new $1,798.00

[Dirtcrasher]

200X power is EXPENSIVE; And the sleeving costs vary from place to place.

I too see lots of cash going into this.

Wanna know the hole size in the cases? I can get that lickety split but very few people wanna bore cases and paper thin sleeves make for a hot engine............

[Shorty]

200X power is EXPENSIVE; And the sleeving costs vary from place to place.

I too see lots of cash going into this.

Wanna know the hole size in the cases? I can get that lickety split but very few people wanna bore cases and paper thin sleeves make for a hot engine............


OK guys I know what your getting at. Power = $$. Thats a no brainer. And the sleeve skirt for the 70mm piston
Is most likely just as thick as a stock sleeve bored to 66mm.

[aproudcanadian]

you should look into a crf230 big bore sleeve, i no the 251 big bores coe show sells are 69.5mm bore so another .5 mm could be added

[Shorty]

you should look into a crf230 big bore sleeve, i no the 251 big bores coe show sells are 69.5mm bore so another .5 mm could be added

I was gonna use a 1982 TLR250 jug. Or just the sleeve.

[NINJA]

*shakes head*
It's not as simple as you think, we keep trying to tell you this. If it was as simple as bolting on another jug, there would have been plenty of other people that have done it, let alone Honda. Like I said earlier, Honda stroked the motor to make the 230, what does that tell you? You do realize that the motor started life as a CB100 engine? That puppy is already bored to the max by Honda. You are better off just buying a CRF230 engine and bolting it in, it will be cheaper and more reliable then the undertaking you are inquiring about, plus it will have electric start. No matter what, the cases need to be bored. You will not be able to do this whole project for under $1000.

[greenhuman]

I was gonna use a 1982 TLR250 jug. Or just the sleeve.
I think you will find the TLR cylinder and sleeve are cast together and not removable. That's how the 185/200 cylinders are anyway. I used sleeves out of other engines back in the day ie XL175 sleeve is removable and can be machined down on the OD and top to work on a resleeved 200 cylinder.
I am a firm believer in stroker cranks for these engines. If you could find a machine shop over there to do the job properly at a good price, thats the way to go.
With the 83-85 engines, I am looking at modding the flywheel side of the CRF230 crank to work in the 200 motor. 66.3 mm stroke standard and I think a new crank assembly from Honda is not all that expensive. It would be a drop in deal with a cylinder spacer and new cam chain.
Food for thought.

[Dirtcrasher]

OK guys I know what your getting at. Power = $$. Thats a no brainer. And the sleeve skirt for the 70mm piston
Is most likely just as thick as a stock sleeve bored to 66mm.

And will most likely require boring the case......

How many members like splitting cases, a shop to bore it for them or how many have a mill to do so??

TRUST ME, were all with you but there isn't a simply solution or everyone would do it. Someday I plug the stock crank hole and make a new one on the opposing side. Will still need balancing and a reamer or super effecient boring head after indicating in the crank half. Then it has to match it's brother.............

KASEY found basically "bolt on" upside down forks, but they seem to be from an Aprilla, then find the tripple clamps. Good luck putting that package together....................

[atcrider1]

what ever happened with the 410 kits for the air foolers?

[NINJA]

what ever happened with the 410 kits for the air foolers?
Pretty off topic.

[dcreel]

Pretty off topic.

Not really, it was another big bore setup he was going to sell.. that went nowhere.

[Shorty]

what ever happened with the 410 kits for the air foolers?

Still in progress. Very very slow though.

[Aka_am]

The 86-87 x, does have room to fit a 76mm sleeve. +/- .01mm The skirt would be 76mm and total possible is 77mm. So the cases would not have to be bored with .50 clearance. This is good for a 70mm piston. 230cc total!

Problem is piston and sleeve. Stock sleeve is 111mm long.

[Shorty]

Bump for a couple members here. Kits and sleeves can still be made.


One other thing also, DO NOT POST ON THREAD UNLESS YOU HAVE A QUESTION about the product or unless otherwise buying a kit. I don't want any other people posting on this thread that its to much to bother with. Or otherwise.



Shorty:D

[leevarnado]

count me in on a kit.ppl have had good results with the 70mm big bores,ppl who think its not worth it,do a little research.overseas its pretty common.

[Team ATC]

who do u have bore the cases?