200 heads which is the best?

[white rat]

I searched the valve sizes for the 200, 200x, XR and XL and there all the same size, in and ex. Why is one head better than the next if the valves are the same? Has someone cc'd the diffferent heads? Does one have a straighter in and ex track? The castings all look the same to me.

Cheers

[84honda200s]

some of the heads have stiffer springs than the others. out of all the 200 heads id go with the 200x or xr head. i used the 200x head with a 200x cam on my 200s motor. i went with the 200x stuff because it was cheaper than the xr stuff and im a poor sucker.

[white rat]

I have a XR cam already, so all I need to get is the x or xr springs and I'll have the same as a xr head?

[84honda200s]

yup try to get the xr head though. im not sure but i think the xr has stiffer springs.

[white rat]

Did you actually have a look at the heads side to side to see if there's any difference?

I'm just going to order the xr springs and go after the 200 head with a die grinder.

[84honda200s]

no i looked at specs on a honda site. i looked them up by part number. i looked into it all for my auto x. i went with the 200x head because it was cheaper for me. it cost me 30.00 for a 200x head, cam, valves, and rocker cover.

[Dirtcrasher]

And...... Why are stiffer springs wanted for a stock motor? Wouldn't a stiffer spring actually put more pressure on the cam? and wear it out faster? If the spring returns the valve before the piston comes up, isn't that it's only necessary function??

[bones200x]

Stiffer springs means better seal. I thought xr and 200x heads were identical, just cams were different???? The xr cam was the hot set up back then.
Come to think about it. I think only the 185s head was different looking? all 200's are the same.The rocker/valve cover was different. Either manual decompressor or kickstart decompressor.

[BigReds Forever]

Stiffer springs will not make your valves seal better. If your seats/valve faces are good, a "normal" valve spring will make them "seal" just as good as a heavy one. The reason for running heavier springs is to prevent valve float, i.e. the valve not returning closed as fast as the cam allows it to. This will happen with higher lift cams, as the valves are being pushed further open, and also when running higher rpm's, as the valve is getting pushed open at an excessive speed. Do to violent forces acting upon the valve at such high speeds, it may actually open further than the cam pushes it. Ideal valve spring rate is achieved when the valve follows the cam profile exactly at the max rpm for the motor. Anything over that is just overkill and causing excess friction/resistance in the valve train. SO, if you are running a stock cam, and have not done any mods to allow higher rpm operation, theres no reason to run stiffer springs than stock (for that cam).

[TheFamer]

hey do the 200x and the xr200r share all the same parts? i asked that in another thread. i wanted to get a rebuild kit for my xr but the kit is designed for 200x. i heard the trike has lower compression and a smaller bore. but i could always get a over sized piston with high compression right? you guys said that the valves are the same, and you can swap out cams and whatnot.

here is the kit.
http://cgi.ebay.com/ebaymotors/NEW-Honda-Atc-200-200S-200M-Engine-Top-End-Rebuild-Kit_W0QQcmdZViewItemQQcategoryZ43977QQihZ012QQitem Z220172514014QQrdZ1QQsspagenameZWDVW

what do you think?

[white rat]

Stiffer springs will not make your valves seal better. If your seats/valve faces are good, a "normal" valve spring will make them "seal" just as good as a heavy one. The reason for running heavier springs is to prevent valve float, i.e. the valve not returning closed as fast as the cam allows it to. This will happen with higher lift cams, as the valves are being pushed further open, and also when running higher rpm's, as the valve is getting pushed open at an excessive speed. Do to violent forces acting upon the valve at such high speeds, it may actually open further than the cam pushes it. Ideal valve spring rate is achieved when the valve follows the cam profile exactly at the max rpm for the motor. Anything over that is just overkill and causing excess friction/resistance in the valve train. SO, if you are running a stock cam, and have not done any mods to allow higher rpm operation, theres no reason to run stiffer springs than stock (for that cam).


That's the reason for me. I'm hoping that the lightened flywheel will give a few more RPM.

[white rat]

hey do the 200x and the xr200r share all the same parts? i asked that in another thread. i wanted to get a rebuild kit for my xr but the kit is designed for 200x. i heard the trike has lower compression and a smaller bore. but i could always get a over sized piston with high compression right? you guys said that the valves are the same, and you can swap out cams and whatnot.

here is the kit.
http://cgi.ebay.com/ebaymotors/NEW-Honda-Atc-200-200S-200M-Engine-Top-End-Rebuild-Kit_W0QQcmdZViewItemQQcategoryZ43977QQihZ012QQitem Z220172514014QQrdZ1QQsspagenameZWDVW

what do you think?

If you have time to collect parts, you could do it cheaper than that piecing it together your self. Wiseco 10:1 pistons are on ebay all the time for around $50, I payed $47 for mine. Valves spring, valves and cam chains are there too and cheap.

The stock bore on the 200x is 65mm and 65.50 for the XR, I think that the XR has a .5-7:1 difference higher in comp ratio.

Everything should swap between each other in the heads.

Cheers