200X: Hard starting

[Glenn J]

It only does the backfiring if I give it gas after I first started.

The lean suggestion makes sense.....backfiring and stalling when giving it gas during start up and a high idle once it reaches op temp.

Does anyone here know what side pilot (the one that's adjustable from the underside of the carb....near the intake manifold) is stock? What's the next size up?

[chris200x]

I'm glad to see I'm not the only one having these problems. sorry glenn! I found that the backfiring I had was caused by an airleak in my intake boot. Make sure it's nice and tight against the cylinder. You don't even want to know how I solved my problem. lol Check out my thread rejetting and plug chops.

I'm not sure which #'s you want but I think you want the #35 is stock (Ithink) then my rebuilt kit also has a #40.

After you get it started and warmed up turn the pilot screw slowly clockwise until the engine stops running. From this setting turn the pilot screw back out one full turn or 360 degrees. restart the engine and reset the idle speed if necessary. that what my manual says anyway

[bigredhead]

Glenn.. that screw you are talking about is the air/fuel mixture screw...... My manual says to start the engine and get it to operating temp first...

then turn it in until the engine starts to sputter *( you will be able to hear the rev's change and it will sound different ) .. make note of it's position on the clock... then turn the other way until the same thing happens.... set it between those 2 positions.

[Glenn J]

Thanks guys. I think I'll give that a shot today. That screw is a PITA to get to when the carb is mounted, but it's easier (and lesss time consuming) than pulling off the carb.

I will also check for air leaks.

[bigredhead]

Try a flat head bit ( the 2 " type used on cordless drills with double heads on them )

[Glenn J]

That's exactly what I used the last time. Barely fit, but it worked!

I think my service manual lists the pilot sizes. I take it most dealers have jets in their parts deparment?

[Troll 2]

I sent fuzzy a special tool to adust the carb glenn. Maybe he will send it to you....lol Hey, be sure your "slow jet" is new.

[Glenn J]

That's the one I'd like to replace Troll. The Honda manual calls it a pilot. That chart calls it the slow jet.

Once I figure out what size it is, I'll hit the local dealer and get the next two sizes up. I bought some tires from a local guy today at lunch. He said upping the slow/pilot made his old 400EX a lot easier to start.

[chris200x]

Just so every one is on the same page ((and I know what the hell is going on!) which ones are you talking about. The smaller ones are marked (the ones I have) 108 and 110. The longer ones have a 40 and a 35.

[oddball3]

The air screw is only one size there are no sizes. When you turn it in its richening it allowing less air. When you loosen it your leaning it allowing more air. I think factory settings was 2 and one eighth turns out. Turn it in untill you feel resistance, back it out 2 turns and try it, adjust acordingly. Turn in to richen, turn out to lean. If that does not really affect it then you need a different pilot jet.

[chris200x]

Your talking about this? The one on the very bottom of that pic of the carb?

[Troll 2]

Just so every one is on the same page ((and I know what the hell is going on!) which ones are you talking about. The smaller ones are marked (the ones I have) 108 and 110. The longer ones have a 40 and a 35.

The slow jet is the longwer one and has alot of problems with getting plugged up.
Heres a chart and # link. http://www.keihin-us.com/list.htm

[oddball3]

Your talking about this? The one on the very bottom of that pic of the carb?

The lower one is the air screw, the one above it is the pilot/slow jet and the top one is the main jet.

[Glenn J]

The air screw is only one size there are no sizes. When you turn it in its richening it allowing less air. When you loosen it your leaning it allowing more air. I think factory settings was 2 and one eighth turns out. Turn it in untill you feel resistance, back it out 2 turns and try it, adjust acordingly. Turn in to richen, turn out to lean. If that does not really affect it then you need a different pilot jet.

On the 200X carb, the screw is on the cyl side of the carb. Backing it out richens the mixture, turning it in leans it out. For carbs where the screw is on the air box side, it's the oposite. I have a link somewhere about this that I can post. I printed out the info and stuck in the binder with my shop manual.

Good news! Last night I backed the pilot out a turn or so. Bike fired in two kicks and no more popping. It also idled better just after starting.

I looked in my manual and could not find the pilot size. Troll's carb link shows they're available, I just need to figure out what size is stock, so I can upgrade a bit.

[jenndnn3]

Glenn I went from a 35 to a 38 on mine. But that was for the xr200r. It definatly helped. My neighbors 200s, my 85 200x, my 86 200x, all have/had 35 in em. Just look at the number on that slow jet and see what you need. Troll mentioned plugged up his (my neighbors) was so bad I threw the jet away. It wouldnt start. After that it pretty much purred, after cleaning out the carb. And a new slow jet.