200x high and hanging idle ???

[drhill]

Ok - so I bought an 85 200x a few weeks ago and have been working on various carb issues ever since.

Bike started out with cracked intake boot (got a new one) and a miss under load...

Verified Spark is good. cleaned out carb twice and most recently put in a rebuild kit for the carb.

Current issue: very high idle with air screw and mixture screw at previous settings (when bike idled and ran fine at slow speeds). I can adjust the air screw WAY out and get a sort of normal idle speed but it wants to die and sounds like its popping through the exhaust. In addition, with the air screw way out trying to get a low idle, the bike has trouble settling back into normal idle after a rev.

It sounds like an air leak problem to me but where could this be coming from if not the intake boot?

Any other ideas??

THanks!!!

[harryredtrike]

an easy way to check for intake leak is,get a propane torch and dont igniite it.turn gas on and wave around the carb intake boot and head and manifold area.if motor revs you have a leak if not it's something else.

[200XMichigan]

Set your air mixture screw at factory settings, not what it was before you reuild the carb. Turn the air screw in until it stops, gently, don't force it. Turn it back out 1 1/2 turns. Thats a pretty much generic setting, I think the 200X might be 1 1/2-2 full turns out. Then adjust the idle speed screw. The mixture screw is not for setting idle speed.

[drhill]

Thanks guys...I think my terminology is off...by air screw I ment idle screw...the mixture screw I know is for more fine tuning once you have the idle about where you want it. I'll have to look up the settings but the bike was at factory settings when I took it apart - so i did set it back to 85 200x settings. I believe 1.5 turns out on the idle screw and 2 1/4 on the mixture screw...

Either way - that idle setting isn't even close...motor races as soon as it kicks over and won't slow down even a bit until I have the screw out several more turns...

[Dammit!]

Also check that your throttle cable isn't too tight. If your idle changes when you move the bars left to right, the cable is either too tight or binding up somewhere.

Sometimes it's the simple stuff that gets us.

[WIkid500]

Also check that your throttle cable isn't too tight. If your idle changes when you move the bars left to right, the cable is either too tight or binding up somewhere.

Sometimes it's the simple stuff that gets us.



It could be getting pinched between the tank and the top frame tube also. Had that happen one of the first times out with mine.. Real exciting when she's pinned aiming for the trees lol.

[drhill]

Yeah - i thought about the throttle cable...I'll start her up and turn the bars and see what happens...I checked for binding last night, nothing major but I'll still loosen the tank and move it around to see what happens...oh yeah, and I'll spray the WD-40 around to check for leaks - I don't have a propane torch :(

Thanks again for all the suggestions guys!! :D

[drhill]

I had a chance to play with the 200x a little tonight...

Started up after a few kicks...idled rediculously high again, thought it was going to blow up. turned the bars, no difference in idle, messed with the fuel tank and the sprayed wd40 methodically on the intake mating points, around the head etc...no change.

tuned it to run as best I could, maybe close to 4 total turns out on the idle screw and out about 3 total turns on the mixtuer screw....actually idled pretty well and ran well. I stopped and restarted several times and it started right up each time. checked the plug and it was clean, if anything the electrode was on the lighter side (lean?).

Well, I went to restart about 20 minutes later and ran it about a block away from the house and it started sputtering and stalled. Couldn't get it restarted. Pulled plug, it was clean...I'm really confused.

Now I am totally confused. Maybe the coil is weak or bad CDI unit? If it starts right up tomorrow does that point to an ignition issue?

[drhill]

ok - bike started right up this AM. Do you guys think I have an ignition problem?

[200XMichigan]

3 turns out on the mixture screw is too much, turn it back in, when you turn it in your idle speed will increase, (the mixture will become leaner) then turn down the idle screw.

Be precise with the mixture screw, 1/8 of a turn can make a big difference.

[oscarmayer]

you sould be anywhere from 1 1/2 to 2 1/2 turns max. and that's adjusting little by little. the mixture screw is fuel flow into the engine during idle and throttle blip too much is bad, too little is bad got it? it's not to fine tune the idle but to tune throttle responce and smoothness. you set stock settings of try 2 turns out onthe mix, then on the idle, you turn out till it lowers to the speed you need. once out and warmed up, blip the throttle, if it stumbles listen to when ti does. if it has a big delay then blasts up, it;'s too much out, if when you let off it dies, it's too little.

[drhill]

Ok - I will go back to a correct mix screw range and follow what you guys have laid out. The only reason I messed with the mix screw beyond the factory setting was that it made the idle smoother/better once I got the bike to the correct idle speed. Throttle resonse is really good/smooth as I set it (really good at original setting of 2 turns on the mix screw as well though!)

Any ideas as to why the bike dies after running it for a while? Sputters and dies, doesn't re-start until hours later, but then once it cools down, runs great again??

[harryredtrike]

get the carb right first.you could be overheating with incorrect settings.once carb is right your problem maybe solved.

[WIkid500]

That could be coil issues. Get an ohm meter and read the coil, cdi pick up and the plug that comes from the flywheel, they should match what the book shows for ohms when cold and should be the same when the machine is hot. If they are not the same when it's warm you found your problem. Change whatever part is broken/malfunctioning.

[rdlsz24]

It sounds like you may be tuning the carb when the motor is still cold, and then when the motor warms up it completely throws everything off

Rob

[drhill]

That could be coil issues. Get an ohm meter and read the coil, cdi pick up and the plug that comes from the flywheel, they should match what the book shows for ohms when cold and should be the same when the machine is hot. If they are not the same when it's warm you found your problem. Change whatever part is broken/malfunctioning.

Got a multimeter, I'll check that out...excuse the noob electrical question - I can check electrical resistance (ohm) without the bike running right??

[drhill]

It sounds like you may be tuning the carb when the motor is still cold, and then when the motor warms up it completely throws everything off

Rob

hmmm...i though about that last night...I made the final adjustments after about 20 minutes of revving, idleing etc...was pretty warm I think?

[rdlsz24]

Yeah that should be fine

Rob

[WIkid500]

Got a multimeter, I'll check that out...excuse the noob electrical question - I can check electrical resistance (ohm) without the bike running right??


Yep checking the ohms you will want to do when the machine is off. Just unplug the wires and check the readings, they should be within spec of what the service manual says.

[oscarmayer]

idel is the low end along withthe pilot jet, once you get into it hard, it will need a possible bigger jet or smaller jet for running correct at WOT.

[WIkid500]

idel is the low end along withthe pilot jet, once you get into it hard, it will need a possible bigger jet or smaller jet for running correct at WOT.

True but if he gets it running correctly until everything gets warmed up that could lead to believe it's electrical. If jetting is stock on a stock motor there shouldn't be a lot of carb tuning to do to get it to run somewhat decent. Even if the main jet was off a few the idle should be able to set between the air mixture and the idle screw.


IDk just thinking out loud.

[drhill]

Ran it last night quite a bit...it wouldn't die on me like before but it was cold last night (upper 30's).

Tried different plugs, they all came out lean...ran the bike at all different RPM and loads...runs great...but lean. I even took the opportunity to clean up some old fouled plugs :)

Didn;t bother to test ignition because it ran all night. The warmer the bike got, the more i had a tough time getting it to idle on it's own. Still ran great though - no hesitation, smooth clean power.

Oh yeah - I checked the mixture screw, it was at 1.5 turns from yesterday so I left it. Tried moving it to 2 turns at one point...didn't really help. The idle screw ends up approx 4 turns out.

Gotta be an air leak somewhere. I RTV'd the intake boot to the carb a while back because the o ring was shot. I feel like an idiot, but I forgot about this. I got a new oring in the carb kit - think this is worth a shot? clean the RTV out and install the o ring????

[oscarmayer]

yea he can get it close wikid500.
sounds like the main jet is too little or
did you try loosening your gas cap? maybe the vent is jacked and restricting flow.
also is tehre a filter on the fuel line? can it be clogged? what about the peacock? is it ok? is the tank full of rust or rusty flakes floating round?

jsut thinking of stuff that can clog stuff and restrict flow.

[drhill]

thanks for the tips oscarmeyer...

Main jet is 108, stock for this bike from what I have been told...I've cleaned the carb 3 times, drained and cleaned the tank, filter sock in the tank and petcock once (i check the petcock for flow each time I test it just to make sure)...

I have tried running with the cap loose and no difference (blew through the line too)

I don't have an inline filter...where could I get one of those in a local store? Home Depot, Autozone maybe??