Porting & Polishing??..??

[MPNX2]

I have an all stock 200X that I am looking to get more PEP too. I was wondering if I could do a porting and polishing job to it by myself or if I would just be better off taking it to someone else to do? Has anyone out there doen this on there own. If so any advice or insturctions?

[Mr. Kasey]

carb and exahust would be a great start,, porting is best left to the pro's

[MPNX2]

It currently has a Cobra exhaust on it. I should have mentioned that. What size carb should I be looking for???

[bones200x]

I ported and polished my own.. But if you haven't done any rad mods before, let a pro do it.
Carb depends. What kind of cam? they say 26mm to a 28mm will do fine.
I'm getting ready to put a 28mm Mukuni on mine. They say a 80-83 xr200 (NOT the R) carb and intake will work great. Its a 26mm. Haven' tried it.. good luck

[markb]

other than cleaning up the ridge under the int. valve and the sides of the bowl on the exh. you'd be doing more harm than good. VERY few people can port a head and not screw it up and the short side radius on that head isn't the easiest to work on.
mark

[Kryten]

Check out the old magazine article posted on this site. It's called "Top 200X Mods." By the way the '80-'84 XR200 intake manifold is discontinued by Honda. I had to get one from a used parts dealer.

[MPNX2]

From your reply it sounds like you have done something similar to you 200X. If so could you please give me a run down as to what you did. I plan on like I said porting and polishing the head, ading the XR200 crab, adding the midrange cam available from Powroll, I may also go with the stroker kit and big bore kit that they have available, of course I will need to add high performance valve springs. Also, I noticed that someone has an oversized intake vavle availabe as well. I am a little unsure of doing all of this because I do want it to run well afterwards and I like reliabity. Please let me know how you think all of this will work together. If you want to check out a link where I am posting my progress feel free. Here is the link:

http://www.3wheelerworldforums.com/viewtopic.php?t=14681

Thanks for all the help... I am going to need it...

[Kryten]

Here is what I did:

-Wiseco 10.25:1 piston(66.5mm bore) for a full 200cc
- midrange Webcam with heavy duty valve springs
- DG exhaust
- K&N airfilter
- 26mm XR200R carb
- '84 XR200 intake

I've had the above mods on the bike for a while except the carb since the stock 200X throttle is not long enough. I just got the throttle cable and the XR200 intake so I have yet to put it on. There is a noticable difference in power compared to my brother-in-laws stock 200X. I'm sure with the larger carb it will really make a difference with everything else.

What other people said is true though, you can only get so much out of a 200X. If you don't have the money for a 350X(way more powerful) this is probably the way to go and doesn't cost a whole lot.

[MPNX2]

It sounds like I will have to get a throttle cable for the XR carb as well then... Thanks for all the help. Did you happen to check out my posting from the link above?? I will let you know how it turns out..:thumbsup:

[Kryten]

Yeah, I checked out the link. My XR200R carb is off a '92, guessing you could use about any year.

[markb]

i talked with a guy who had similar mods to my motor and then he went with the stroker kit and didn't like it. he said it really lost it's revs, he was going to try a 30mm carb on it then i lost contact with him and can't find him anymore.
if you don't put the squeeze to that little motor it limits how much you can get out of it, but a lot of people don't want to buy race gas which i can understand. i've got the powerall cam i think your talking about, they want $230 for it? i ran it in the modded motor and the torque is GREAT but it doesn't really rev at some point it will find it's way into the stock bike. i think poweralls pricing is a bit extreme so i just bought a 172 grind from web with the .395 lift. i'm also trying a thinner head gasket and will post cranking lbs. after the rings seat.
this bike is a play bike for me that i can try things on pretty cheaply that's mainly why i do it but i also think like me the 350x is overweight for what it does.
also motion pro will make any cable you want.
mark

[MPNX2]

Yeah I am a little indecisive about which cam to buy. As of now I am going to get the head ported and polished, run a 26mm carb, an XR200 intake, also I will be going with a Wiesco piston kit which will raise the compression to 10.25:1 and rasie the displacment to 201cc's, the web cam I think I am going to be using is used for good midrange and top end power and gives .362 lift and 270 duration, also I will be running high performace valve springs. Powroll does seem pretty expensive and I have decided not to go with a stroker kit due to the cost and I dont want to send them my parts.

Hopefully this is a good combo to be running because I hope to only have to motor aprat once.

[Kryten]

The XR200 intake might create some problems because it is at different angle than the stock 200X manifold. The carb is not just gonna line up with the airbox boot. I don't know if another intake would work better, I was just following the old magazine article which was taking the 200X motor and putting it into a quad chassis.

[Kryten]

Don't bother with the XR200 intake. It won't work in a 200X frame. Yes, it mates to the bigger carb , but because of the angle it just won't work. Finally got to try the XR200R carb(with the stock 200X intake) and it does make a big difference at least with other mods I've done. It doesn't mate perfectly to the intake manifold but it still works. Also used the XR200R throttle cable, took some special modifications for it to work. Like markb said, go to motion pro and have a cable made that will fit better.

Now I am going to split the case and fix the kickstarter. Probably some broken teeth on the internal gears.

[MPNX2]

Do you know what year intake manifold it is? According to the article posted here: http://www.3wheeler.org/3&4wheelaction/9-96~200xMods.html

It should work. I took the cylinder head and the cylinder to the shop today to have it ported and polished, and the cylinder bored. It is going to be 1.00mm overbored and the shop is ordering my new webcam cam (the midrange cam) and valve spring kit. After all of this work is done I will look into what has to be done about the carb and intake and throttle cable... Thanks for the help...

[Kryten]

According to the article, they are talking about putting a 200X engine in a quad chassis so that's why they suggest that intake. I have an '84 XR200 manifold and it just won't work, it would angle the carb right where the shock is.

[MPNX2]

LOL...I didnt even think about them using a quad frame on that project. Man where was my head... OK so what is your solution to the problem...?

I went back and re read your posts and it looks like you are using the stock 200X manifold but a different throttle cable. I will know more after I get the motor back from the machine shop and back in the frame...

[Kryten]

Yeah, I should have realized it was not going to work. Like I said the 200X intake will work. It's not perfect, but it did not seem to be leaking. The stock XR200R throttle cable had to be routed differently and then had to put spacers in between the throttle housing and the cable sheathing. The 200X throttle cable is about 1/2 inch too short, at least with the carb I have.

[MPNX2]

So how did it seem to run with the bigger carb on there. Was it a big improvement???

[Kryten]

Definately a big difference with the bigger carb. Finally makes the other engine mods worth it.

[MPNX2]

The stock intak seems to be made out of cheap metal. I was think of taking it down to my local machine shop and just having them bore the hole to the 26mm size to match the XR200 carb. It seems like there is plenty of materail on the intake to do this. I am also pretty sure it would be easy enough for a machine shop to do. Have you thought of that??

[Kryten]

Sounds like a good idea. I will have to look into that.

[MPNX2]

I hope it works for you please let me know. I would look into myself but my intake manifold is with the motor at the shop. I hope to have it back next week sometime.