ATC 200x Rebuild Compression

[Scootertrash]

Stock compression ratio is 9.6:1, the Wiseco bumps it up to 10.25:1 (not something I would call high compression in this case), unless you went with the 12:1 high compression piston

[Honda200x.]

Thanks for the info guys i really appreciate it, isn't the next size up for me .75?, and honda doesn't sell a piston for that i belive, my only concern is my kick starter slips just a little probably once every 20 kicks and wouldn't the high compression piston accelerate the process, also don't you need to run 93 with the 10.5 to 1 and would I need high compression gaskets?

[Scootertrash]

Thanks for the info guys i really appreciate it, isn't the next size up for me .75?, and honda doesn't sell a piston for that i belive, my only concern is my kick starter slips just a little probably once every 20 kicks and wouldn't the high compression piston accelerate the process, also don't you need to run 93 with the 10.5 to 1 and would I need high compression gaskets?

Nope.

I Just put the 10.25:1 in my 200S and used a regular gasket set, Vesrah gaskets if I remember correctly. I just run regular gas and it runs great.

You are correct on Honda not selling a .75 over piston. I'm not sure if you get your pistons at the same place that does your machine work, but it is possible that you will not have to bore another size over. If you could get the bore dimension, you could call Wiseco and see if your bore falls into their tolerances for their .50 over piston. It could save you the cost of another bore job.

As far as the kicker slipping, there is a fix for those gears, an upgraded spring for the kicker or you could shim it with very thin shim washers. The fix for the gears is back cutting them slightly so they lock together better.

Here is a link to the 200X kicker slippage thread. The gear mod starts close to the bottom of the 2nd page and there are some good instructions:
http://www.3wheelerworld.com/showthr...utions-inside!

[Honda200x.]

That makes me feel much better about it so like 87-89 is fine? And do you think I will have any overheating problems with a 1.00 bore and a high compression piston?

[yaegerb]

I don't know what you are looking to spend but for 210.00 you can go with a 10.5:1 piston from Powroll. It comes with the necessary gaskets, pin, everything you need. Just got done doing the kicker mod. You can mess with the shims but the only way to fix is to back cut the gears. Also you wont need to run high octane with a 10.5:1 piston. So, 210 + 50.00 for a new bore + 10 bucks to re-jet. With tax you are going to spend approx 290.00 for a reliable motor with great components.

[Scootertrash]

[QUOTE=Honda200x.;1104314]That makes me feel much better about it so like 87-89 is fine? And do you think I will have any overheating problems with a 1.00 bore and a high compression piston?[/QUOTE

87-89 octane? Yes you will be fine, and you can run 93 or whatever it is if you want.

And, if you have to go to 1.00 over, you shouldn't have any problems with overheating.

Nothing against yaegerb or Poweroll, but:

Don't assume that you have to do another bore job. Pull the cylinder and have it measured like I said in my previous post. It doesn't make sense to spend an extra 50.00 if you don't need to.

You can get a Wiseco piston on ebay for less than 120.00 (or close) Both Wiseco and Poweroll are forged pistons. (I wonder who makes the pistons for Poweroll?)
Base gasket from Honda is around 6.00
Head gasket from Honda is around 15.00

or you could go with a Cometic or other top end gasket set for around 20.00-25.00 and have a spare exhaust gasket and a few other spare gaskets/seals just in case.

You already have the jets for .50 over, so if it works out in your favor you won't have to buy more jets.

So for around 150.00-160.00 (with quick touch up hone job if you so desire) you can still have a reliable motor with great components, and over 100.00 left over to buy gas, beer and take your favorite girl out for a nice dinner.

[Honda200x.]

Im going to pull the whole thing apart tomorrow then bring the cylinder to the machine shop down my road(literally down my road) and have them measure It, so if it's exactly 65.5 mm then I can just buy the 65.5 mm 10.25 to 1 piston wiseco offers(and rings, pin and clips) and be done with it right? Cause if my bore is 65.5 mm then doesn't that mean the piston that wiseco says is for 65.5 mm is all set to fit in there with the right clearances? Then if it is exact then i'll have them do a quick hone and call it a day, and with that piston will the Honda gaskets work just fine? And i'm not going to open my bottom end and fix the slipping gears cause I cant back cut them, do you think ill be fine if it almost never slips. I've rebuilt many motors and know a lot about them but I have never done a bore on a motor just bought new cylinders, thats the reason for all the question's, by the way i'm 15.

[Scootertrash]

Have your shop give you the dimensions of the cylinder and the piston, then call Wiseco and see if their piston falls into the specs for the cylinder.

Here is a Wiseco piston kit for 104.22. Piston, rings, clips and pin.:

http://www.ebay.com/itm/Wiseco-Pisto...bfe89d&vxp=mtr

Or, if you want to save ordering the gaskets from Honda, here is a Wiseco top end kit for 136.74. I know it says 200S, but it's the same kit for the 83-85 200X. Same as above, but has all the gaskets included:

http://www.ebay.com/itm/Wiseco-Top-E...sories&vxp=mtr

Don't order your kit until you verify the dimensions.

[Dirtcrasher]

Im going to pull the whole thing apart tomorrow then bring the cylinder to the machine shop down my road(literally down my road) and have them measure It, so if it's exactly 65.5 mm then I can just buy the 65.5 mm 10.25 to 1 piston wiseco offers(and rings, pin and clips) and be done with it right? Cause if my bore is 65.5 mm then doesn't that mean the piston that wiseco says is for 65.5 mm is all set to fit in there with the right clearances? Then if it is exact then i'll have them do a quick hone and call it a day, and with that piston will the Honda gaskets work just fine? And i'm not going to open my bottom end and fix the slipping gears cause I cant back cut them, do you think ill be fine if it almost never slips. I've rebuilt many motors and know a lot about them but I have never done a bore on a motor just bought new cylinders, thats the reason for all the question's, by the way i'm 15.

That would be in a perfect world,but; a Wiseco 65.5 could be 65.503. I don't know what their tolerance are.

I know you just trying to figure it and probably broke. We've all been there. I would bring the new piston and jug and let them check the fit.

In all honesty, I just tossed in a 10.25 into my 350X crate motor and hoped for the best but honestly, it's better check it now than later........