200X Exhaust & Air Filter

[MPNX2]

I have an 83 200X that is bone stock I just put in a Uni Air Filter and a Cobra exhaust system. After the install I fire the bike up and it is idle really high (not to mention really loud). The idle screw seems to do nothing. Is this a common problem am I going to have to tune the carb or something. Please help....

[REPOBUD]

ITS RUNNING LEAN. DONT RUN IT THIS WAY!!!! YOU COULD BURN UP THE MOTOR. YOU HAVE TO RICHEN IT UP BY PUTTING BIGGER JETS IN THE CARB. IF COBRA DIDNT GIVE ANY JETTING INFO. FIND OUT WHAT SIZE YOU HAVE IN THERE AND GET AT LEAST THE NEXT 2-3 SIZES UP.

[250sx]

He's right, DON'T RUN IT AGAIN UNTIL YOU REJET! You can also try moving the needle to get some more fuel in there, but you'll definitely need to go up at least 1 size on the main jet & probably 2-3.

[MPNX2]

Where can I get more jets? Also how can I tell what the size is on the one that is in there? My service manual states that the main jet size is a 110 do I need to go a higher number like a 114? I dont know much about carbs.... Dennis Kirk has a carb rebuild kit that says it contains jets but it doesnt specify the size..... Here is the link

http://www.denniskirk.com/powervendor/details/detail.asp?serverid=OffRoad&PartNo=171341

[REPOBUD]

YOUR LOCAL CYCLE SHOP SHOULD HAVE THE JETS IN STOCK. TAKE THE BOWL OFF YOUR CARB. THE BRASS PIECE IN THE CENTER IS THE JET IT SHOULD HAVE THE SIZE STAMPED ON IT. THEY USUALLY GO UP BY 5S. SO IF YOU HAVE A 110 THE NEXT 2 ARE 115 AND 120. GOOD LUCK.

[250sx]

I think on the 200x the next size will be a 112. Whatever it is, get the next 2 up & you should be covered for the mods you listed.

[hrc200x]

At idle I don't think the main jet is doing much if anything. Although it might still need to be jetted. Best thing to do would be to look at the plug and see what color it is, if its brown its perfect, black means its either a very old plug or running rich, and white means its lean. If its white drop the clip on the needle and probably go up on the main jet and see if that helps. Aftermarket pipes do make the 3 wheeler alot louder. Did it idle fine before the mods were put on? Did you mess around with the carb during the time you were putting the mods on?

Its also a good idea when you adjust the idle to tap the throttle or hold the throttle open a little bit, doing this won't make a dent in the carb slide which can make it very hard to get the idle where it should be.

[jenndnn3]

Whoa hold your horses I seen this before.....just dont ask where....lemme clarify one thing your idle screw has absolutly no effect correct??? Your engine races??? floods gets worse as you push gas...have you had any reason lately to say pull your throttle off for any reason have you? If so you need to pull that piston inside your carb and turn it around......

[MPNX2]

Wow thats a lot of replies. I went to my local shop and I got a 112, 115, and a 118 so I should be covered. I did not do anythong to the carb during the mod process. The bike hasnt idled real well ever since I got it. The idle just seems to change all the time. Sometimes its high, sometimes it wont idle at all. I turned the adjustment screw and it seemed to have no effect. I will replace the jet and go from there.. Thanks for all the help guys. Keep the tips coming I have got a lot to learn.

[LoadEmUp]

Do you need to change gaskets each time you try different jets? I'll be doing this soon enough, since I'm pretty much putting the DG alloy pipe on the stock engine. Everything miked out alright, so I don't need engine mods, other than the four gears I've ordered for the trans (which I saved roughly $40 on buying from Service Honda instead of Parts Fish.) I bought a carb rebuild (gasket?) kit but haven't opened the bag yet (so many little pieces) so I'm not sure what's even included.

[MPNX2]

You might have to change at least the bowl gasket. I had to change mine because it leaked. It seems to have fixed the problem.

[jenndnn3]

Mp I really hate to buck everyone else advice but Im almost postive you dont have a jettin issue (in fact I would be very surprised if you do).....check that jet needle and piston before you yank off your carb....everything you are describin is the same issues I had....took me 3 months and several tear aparts to figure out my own stupidty. I have an aftermarket filter and cobra exhaust and Im running stock jets.. The piston has one side that you can remove the spring and and needle that goes all the way down and the other side of the piston is the beveled edge the idle screw has to be set on the beveled edge side.....Your idle screw will then be effective. Also set your needle if not done so already on 3rd groove (middle one)

[$"|"I|\|G|2@?]

dont take the whole bowl off or take out the carbs i got an 84 200x and i change my jets around alot..and it seems like just taking off the drain plug on the bottom of the bowl gives you perfect acces to the main jet..all ya have to do then is use a wrench and remove it ..no need to mess up any gaskets then...:thumbsup: ....

idling problems...for me it was the carb i still have a similar problems the bike will idle very high and then sometimes not at all...i rebuilt the carb a while back and it seemed to fix the problem on the 83 i had but now my 84 is doing the same thing....

some other things to check is if your gas flow is free and if the vent hole in your gas cap isnt plugged up with something..

and yeah the cobra will make the bike extremely loud!..i sometimes run my cobra without the core in and jetted up with a custom main jet i drilled out..well lets just say even i need ear plugs..:doh: :demon:

[MPNX2]

I put a 115 jet in and they idle hasnt changed and it is running rich. I started it twicw and pulled the plug and it was dark black and was wet. Where do I go from here??

[LoadEmUp]

When you put these things on, could you have moved or re-routed the throttle cable? Maybe it could be adjusted.
And as far as jets go, the '84 stock jet is a 108. The 110 is the next one richer, which was stock on an '83, according to Clymer. On the 185, 200, 200s and 200M, E & ES, they seem to go in fives, using either a 95, 105, 100 and 95, respectively. And the carb model numbers seem to indicate a different type of carb on the X than the rest. A 112 may be too rich, maybe a 110 would be a better start.
But you do need to do your plug check correctly, though. With a warmed-up engine, run full throttle for a bit then cut the engine off and coast/push back if you have to. It really does make a difference.
But I agree, jetting should not affect the idle much, if at all. Double-check all your carb specs like the float level and get it to idle before anything else.

[haywood71]

the main jet has nothing to do with the amount of gas at idle, it the pilot jet (slow jet).

let the engine warm up and turn the idle mixture screw at the bottom of the carb in til it softly seats, then back it out 1/4 turn at a time allowing 10-15 seconds until the engine catches up between turns, count how many turns to where the engine idles the highest.

between 0-1 turns means the pilot jet is too lean.
between 1-2 turns is ok
over 2 turns means the pilot jet is too rich.

FOR THE MOST PART FOLLOW THESE RULES;
pilot jet=idle to 1/4 thottle
slide and needle=1/4-3/4 throttle
main jet=3/4 throttle to WIDE OPEN

the pilot jet you have to take the bowl off to change, should be a 38 or 40 stock, dennis kirk carries 21 & 22 series DG pilot jets
35,38.40,42, 45 etc. etc.
i believe you will need the 21 series for the keihin PD 24mm carb