xr 200 cam

[BaronX]

How much of a power increase will a brand new XR 200 cam give to a 84 200X? Ive heard they give a good boost is it true?

[Glenn]

Bump. I'm interested in this too. These things are under $60 from servicehonda.com.

[BaronX]

They are that cheap new from honda! Wow i might jsut have to go get one from them. I know someone has some input on this so please tell us how it performs.

[haywood71]

I got this info of of another atv forum

Make sure to get a new cam bearing and washer for new cam!
There have been alot of questions surrounding the camshafts used on these models lately.
I thought going over all 3 variants of these OEM camshafts in one post would be helpful to many and answer some of those questions.

Camshaft Part# 14101-965-000
Status: Still available from your Honda dealer as of 12/09/04
This camshaft is used in ALL of the ATC 185/200 series engines except for the '86-'87 200X engine.
And yes, the '83-'85 200X cam IS the same as all the other ATC 200 models.
1980 ATC185
1981-1983 ATC185S
1981-1983 ATC200
1982-1983 ATC200E
1984 ATC200ES
1984-1986 ATC200S
1984-1985 ATC200M
1983-1985 ATC200X
1984 TRX200

Camshaft Part# 14101-446-000
Status: Still available from your Honda dealer as of 12/09/04
This camshaft is used in ALL XR versions of the 185 and 200 dirtbikes up to the 2002 model year except the '84-'85XR200R.
1979 XR 185
1980-1984 XR 200
1981-1983 & 1985-2002 XR 200R


Camshaft Part# 14101-437-000
Status: Discontinued at one point but currently available in limited Qty as of 12/04
This camshaft is used exclusively in the dual sport bikes and has a higher lift and duration than the XR version camshafts.
1979-1984 XL 125S
1979-1983 XL 185S
1983-1984 XL 200R

I also read that the stock 200X cam is actually bigger than the bike cams but the bike cams are better for low and mid-range power.

Jeff

[BaronX]

So the bike cams are smaller? But they give better lowend and midrange how does that work?

[haywood71]

The measured height of the XL bike cam IS lower than the ATC cams. The lift isn't that far off from the ATC version, but the lobe on the XL185S cams ramp is longer......thus more duration.

The XR cams are close to mild web cams but take a little bottom end away.

Neither Honda cams require heavy duty valve springs.


XR cam for mid-range to top end.

XL cam low to mid-range.

Sorry if I caused any confusion.
Jeff

[Glenn]

Good info Jeff! We need to get knowsalot over here somehow. :D

[BaronX]

Thanks for the info ill remeber it and look for an XR cam for the topend.

[haywood71]

Yeah Glenn

Patrick is the MAN when it comes to 200X and XR info, he deserves the nickname he has.


(Guess you figured out from my post on this thread where I got the info from huh. From my "KNOWSALOT INFO" folder)

Jeff

[jenndnn3]

Haywood, a moment longer in that nifty folder if you dont mind.

I am sorry for the highjack, The electronic componets, are they interchangeable? Do I have to stick to the whole kit and kaboodle if I use the xr electronics or 200x or can I just mix and match? Example flywheel, to stator, spark advancer and so on.


The numbers I come up with show these as completely different part #'s. But this isnt flying in the head, because all of the engine compatibilities I am finding.

While your in that folder, do you happen to know the difference between the 2 pistons as they popped different numbers as well. But I would swear to god they are identical. Hey thx Jen

[short4stuff]

Jen I know about the pistons.. but not the rest .. a xr200 piston stock bore is .5 bigger than a 200x .. meaning 65.5mm instead of 65mm... also putting a xr200 piston in a 200x will bump the compression from 9.6:1 to 10:1 because of abit larger dome on the xr200 piston.

... Thats all I know

[Glenn]

Originally posted by haywood71
Yeah Glenn

Patrick is the MAN when it comes to 200X and XR info, he deserves the nickname he has.


(Guess you figured out from my post on this thread where I got the info from huh. From my "KNOWSALOT INFO" folder)

Jeff

And that's a good file to have! :D

[jenndnn3]

Thank you short4stuff! Got to thinking about it last night, keep forgetting I bought a micrometer. Prob would have semi answered my own question right there.

[BaronX]

So if i wanted to bump my compresion i woudl just have to get a xr piston and bore my cylinder? Sweet might have to do that its starting to smoke anyways.

[jenndnn3]

It is nice info huh! LOL I have the whole topend ready to go. Its bottom end nightmare for me.

[haywood71]

Hey jenndnn3

Sorry I don't have any info on swaps for the electrical stuff between the 200X and the XR.

All of the info I have is from a guy on the atv connection forums, he goes by the name KNOWSALOT.

He might be able to help you if your a member of that site, however its racing season for him and I notice his visits to the site are getting to be a little less.


Jeff

[jenndnn3]

Thank you Haywood. That looks like alot of research with a multimeter then. Was hopin to save some time. I figure its probably an all one way system, either you use all 200x or all xr. Unfortantly I am not a member of atvconnection. I have read through there tho. Sounds like the knowsalot is a very knowledgable person.

[BaronX]

I just thought of something. What about the 86-87 200x cams are they bigger or different than the 83-85 cams?

[haywood71]

86-87 cams will not work in a 83-85 200X, completely different heads.

Jeff

[BaronX]

Ive only looked at a 86 200x head when it was on the motor are the valves in different places than the 83-85 valves?

[BaronX]

Ive only looked at a 86 200x head when it was on the motor are the valves in different places than the 83-85 valves? I can the cam chain and everything is on the right side of the motor were as the 83-85 motor the cam chain and everything is on the left side.

[jenndnn3]

The only thing baron is I dont see any major increase using a 86 cam. The 85 your options are so there. So then would it really be worth all the work and money to see if it is possible. Then lets say its slightly off, more money more work. Also the cam is adjusted so that you can dial the valves. vs the just open and set the earlier 200x's. Basically both these cams are way different. I really really just dont see it working. This one thing I will never ever understand, why this engine changed so much, and if it was so great, why it was only here for few years.

[BaronX]

I agree i started to think about it and i dont have a ton of money to put into it. I would also like to know why they changed the engine so much the 86 seems way more complicated than the ealier modals.