whats the difference beteen 200s and 200x piston/cylinder?

[200x_Basket]

i picked up a 200x engine today that needs a top end. the piston has "100" on top of it and the rings are missing. the cylider looks good with a nice hone in it. anyway i have a great runnig 200s with a fried tranny that i was hoping to use for parts. will the 200s cylinder and piston work on the 200x bottom end/head?

[Fuzzy]

It shouldnt be any trouble putting the 200s top end on. But you have to use the 200s piston. The pistons are different and without using the 200x head the piston might hit it. So if you use the 200s cylinder head and piston. You should be fine.

But it wont have 200x power. The 200x setup runs at 9:6-1 and the 200s run 7:6-1 compression. And you will have to study the timing section on both motor`s because the timing for the cam uses different marks between the two. So read up on timing both of them.

And you can get a 200s top end gasket set from dennis kirk for about $15.00 GOOD LUCK!!!!!!:D

[3wheelnut(ace)]

if you use the 200xhead and cam you will be better off than using the 200s head.to start with the X has a better cam. there is NO chance the piston will hit using any combination of the parts you have. the 100 on the piston is really a 1.00 that means it has been bored 1mm or.040 over. and if you see any differance in the cam timing.you let me know because i have been running a Xcam in my S for about 2 years. they time the same !!! but if you want to do it right just buy a set of rings for the X the reason i say this is the X has longer cooling fins than the S.

[dads]

Carb differance

And the 200x has a larger vortex (air intake) than the 200s
I don't know if the 200x carb, will run to rich for the 200s top end.
do to lower compression reshow.

[Fuzzy]

3wheelnut do you run the 200x cam on your 200s head?. Or did you put a 200x head on your 200s?. How much difference did it make in proformance?. I figured the piston and head were different and that is where they gain the other 2 psi compression. I know the part numbers are different for the piston but the bore and stroke are the same. I have seen 200x pistons but not 200s. And i know the 200x has kind of a different shape piston on the top. So i figured that the dome piston fits tighter to the head giving it the 9:6-1 compression. Beings how the bore and stroke are the same. It is the only other thing that would make sence. I was planning on putting a 200x topend on my 200s motor for the added power. But how much would a person gain by just switching cam`s?.

[Fuzzy]

Well i kind of answered my own question. After reading this today i went out and put a 200x cam in my 200s motor. I didnt really notice a difference in low end. But it sure seem to make it wind out longer on high end. And it will bolt into a 200s head without any trouble. I am also running the 24mm 200x carb and 200x exhaust. And with the addition of the 200x cam it really scoots. Thanks for the tip 3wheelnut. I came in here to try to help out. And ended up learning a great way to tweak a 200s motor. :headbang: :headbang: :headbang: :headbang:

[3wheelnut(ace)]

I'm glad you tried it ! now put that X piston in there for a real step up in power. and about those pistons.the 200s has a dish piston.the top of the piston is cupped in about an 1/8".the 200x is a flat top piston .and the wiseco10.25to1 is a dome piston.when I got my wiseco piston the box said it was for the 185 and all 200 s x e es . I did mine by startin with the piston first, i put the wiseco piston in my S and it helped alot so I put on a DG pipe it helped a little more.thats when I put the carb and cam out of my X in it .I didn't even have to rejet and it works great ! BUT the one problem i have had with this set up is the autoclutch is not made to handle the extra power.so I put 20" tires on it . now I'm not saying this bike is fast but it will kick the crap out of a stock bike. good luck with yours.:headbang:

[Fuzzy]

Thanks 3wheelnut. And one more question. If the heads are the same. Can i just use the 200x cyc and piston. With the 200s head so i can keep my decompression lever on the head. I am a little worried about being able to pull it over with the pull start. And though if i wouldnt gain anything by useing the 200x head i might as well stick with the one i got. What are your thoughts on that?.

[3wheelnut(ace)]

I don't see where you would gain anything by useing the X head.I'm useing the s head on mine with the X cam cover so I don't have the decompression. but when I start mine I have to roll the motor up on top of the compression stroke then pull it. the only advantage to the 200x cylinder is the cooling fins.

[Fuzzy]

Ok now i am really confused when i looked up pistons at dennis kirk. It calls for the same part number for my 82 200 as the 83-85 200x. So maybe mine is allready running as much power as it can. Or the aftermarket ones just replace all the other models. So now i dont know if i want to pull the motor out to switch them. I was able to put the cam in with out pulling the motor. And i only have today and a little time tomorrow to get this done for riding this weekend. So i am wondering if there would be that much gain in putting the 200x piston in. I was really pumped on it until i seen that the part numbers were the same. So now i am thinking. It might not be worth all the work if i wouldnt see a change in horsepower. I only have the standard 83 200x piston. I see you got the 12:-1 wiseco. So i could see where that would make a huge difference. So i think i am going to have to save some money to buy a new wiseco piston.

[3wheelnut(ace)]

yea they use a one piston fits all kind of deal. but if you have a stock piston in your 82 S than the piston from the X is a upgrade.iiI'm running a 10.25/1 not a 12/1. and the higher compression will give you that bottom end pull that the cam didn't. :eek:

[Fuzzy]

Oh ok. I will switch pistons then. Thanks again :D.

[200x_Basket]

with all of this switching do any of you have a .50 over cylinder. i just picked up a pop up piston today for FREE :headbang: time to smoke some quads

[dads]

Hey 3wheelnut
did you try going to a little heavier duty springs
on the clutch pressure assembly. make it lockup a little tighter:headbang: :D :headbang: :thumbsup:

[Fuzzy]

Thats one of the biggest draw backs to hoping up a 200s motor. I think you lose some power through the double cluth setup. I am going to try just replacing all the discs and the centrifical(spelling?) On mine and see if that can take the beating. My seem to work pretty good. But i dont know when they were done last. But i think the clutch dics are only like $10.00 but the centrifical(spelling?) Is Like $60.00 for new shoes. Have you had any trouble with that 3wheelnut?. Did you notice a big difference afterwards if you did?.