12:1 200s piston same as 200x? ..

**short4stuff** · 12-31-2004, 11:00 AM

At my dads work .. they have a book there for pistons and stuff, and well it shows the 12:1 for the 200s but it dont say for the 200x... my dad thinks it is different, but aint it the same? .... Somebody let me know... also should I go with the 12:1 or the 10.25:1 ? ...

**Studytime** · 12-31-2004, 12:41 PM

You could try a search- you will find plenty of info on this topic.

Studytime

**TimSr** · 12-31-2004, 01:21 PM

You can check applications at www.wiseco.com

**deathman53** · 12-31-2004, 01:24 PM

if you want to use only race gas, a 12:1 is fine, my advice get a 10.25:1, race gas gets expensive fast

**thefox** · 12-31-2004, 06:11 PM

Originally Posted by deathman53

if you want to use only race gas, a 12:1 is fine, my advice get a 10.25:1, race gas gets expensive fast

I agree, go with the 10.25:1. Oh, yes the 200s piston will fit a 200x.

**83185s** · 01-01-2005, 01:18 AM

yea its the same thing but id put in a 10.25 before u go to 12...not good on the leg ..lol..also yea the gas gets expensive fast..if your cylinder is to big lemme know i got a 200s and a 185s cylinder lyin around (inside) no rust..

**MTS** · 01-01-2005, 02:17 AM

same piston, the 12:1 really wakes up the 200, my friend runs his on 97 octane with some nitro methane added, the nitro methane you can get at a hobby shop, they use it for model air planes works fine in his bike he just adds a little bit to a full tank...hell it would prolly run fine on just the 97 octane...

**Kintore** · 01-01-2005, 11:59 AM

Isnt nitro methane real expensive? and I bet it wakes up the 200, my friend has a high compresssion piston in his blaster and it goes!

**Pistonhead** · 01-01-2005, 01:49 PM

I've got a 2-stroke weed-whacker, one time I accidentaly put a whole container of stp octane booster into it's little tank (before I would have known better). Man, it ran amazingly fast, but it would run solid for 1/2 hour then it would overheat big time and I'd have to let it sit for another 1/2 hour till I could use it again.

**Studytime** · 01-01-2005, 02:05 PM

Originally Posted by Kintore

Isnt nitro methane real expensive? and I bet it wakes up the 200, my friend has a high compresssion piston in his blaster and it goes!

would wake it up? From what I've read nitromethane only has around 1/4 of the chemical energy of premium gasonline (Btu/lb). I'd rather just run premium with some zylene or toluene added to it if I still had preignition problems on 93 octane.

Pure octane boost in a weedwacker accidentally? Hmmm... I would have bet it would not have even ran. IF you put too high of an octane fuel in a low compression engine then you're going to need A LOT of spark advance. Without the increased spark advance you'll be gaining zero of convention fuel.

I'm scratching my head on that one. A story that starts with "accidentally put ..." raises suspicion. Describe to me what "it ran amazingly fast" means.

Studytime

**90nut** · 01-01-2005, 03:36 PM

so is a 12:1 piston to high to be running in a 200x on pump gas(97 octane)? I got one for my 200x because the guy said that it was a direct replacement for my 200x. Well I now know different. Someone else said that it would be impossible to tune and that I would break the kicker gears. I dont know if any of this is true though I just want a second opinion. thanks

**Howdy** · 01-01-2005, 03:46 PM

It's not impossible to tune. Not that easy but possible.

Yes, a 12:1 piston would cause more stress on kicker gears. These kick starter gears are known to break under normal usage with a stock piston. So he is correct there.
Howdy

**MTS** · 01-01-2005, 05:17 PM

i dont know about the nitro methane stuff too much, my friend has a neighbour who is a bike mech and he said he could use that stuff, its not pure nitro it has some other stuff like toulean and ethnol and stuff in it i think....i dont know about this hard to tune crap, he barely even have to change the setting on his carb...from the stock piston

**90nut** · 01-01-2005, 06:43 PM

Howdy, would you personally use the 12:1 piston or would you get a stock compression ratio pistion? I already have the 12:1 piston but if it is going to cause me alot of trouble I will just forget about it and buy the stock compression piston.

**Howdy** · 01-01-2005, 10:22 PM

I had a 12:1 in a 350x I had years ago ( it got stolen ). It caused me a lot of agrivation. Hard starting, cost of fuel ( you can't run cheap stuff and get it to run good ), carb adjustments, ect. Using a 12:1 piston you could tell the power difference, but to me it wasn't worth the agrivation.

Now I don't use anything more than a 10.5:1 for any of my machines.
Howdy

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12:1 200s piston same as 200x? ..