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Discussion Starter #1
I have a 2016 tw 200. My tw has always started without the choke. It didn't matter how cold it was out, it never needed the choke. The bike has always run well once warm and doesn't seem to have any lean symptoms like backfire on decel etc. It still runs well once warm.

Just this week in socal our temps have hit the upper 80's. Now all of the sudden when I get to work, shut the bike off for four hours, it doesn't like to start up again without the choke. Not sure why.

I'm going to start experimenting with bigger pilots and the fuel screw, but usually when my bikes have been lean I can tell during cold starts and backfire on decel or similar running symptoms. These warm weather starting issues are new to me. Anyone else experience this?


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Hi. I have a 2015 that was doing exactly the same as yours. I remember that opening the fuel mixture screw 2 1/4 or 2 1/2 turns out solved the problem. I would recommend doing it if you haven't done it yet.
Remember that in order to access the screw you will have to remove the plug, not a big deal! You will find instructions on this Forum if you look for it. Based on my short time I've been searching here I can guarantee that you won't find better help anywhere else, it is satisfying to see how many members are willing to help out in all kind of "situations" sharing their own experiences.
 

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Discussion Starter #4
Hi. I have a 2015 that was doing exactly the same as yours. I remember that opening the fuel mixture screw 2 1/4 or 2 1/2 turns out solved the problem. I would recommend doing it if you haven't done it yet.
Remember that in order to access the screw you will have to remove the plug, not a big deal! You will find instructions on this Forum if you look for it. Based on my short time I've been searching here I can guarantee that you won't find better help anywhere else, it is satisfying to see how many members are willing to help out in all kind of "situations" sharing their own experiences.
Yeah I've had to drill and remove the plug on several bikes so it shouldn't be a issue.

It just ran so good in cold weather I thought it was pretty much dead on.

Did you simply adjust the fuel screw or did you do both the pilot jet and fuel screw adjustment at the same time?
 

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Discussion Starter #5
So I broke out the $60 service manual and from what I could find, there's absolutely no reference to the fuel mixture screw location. Maybe I'm missing it but it's certainly not easy to find. So I got down to carb level and I'm suspecting the screw is located on the front bottom of the carb. I was hoping not to have to pull the carb to pull the plug out, but it looks like I may have to.


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Front bottom of the carb...yes...that's it bro.
So I broke out the $60 service manual and from what I could find, there's absolutely no reference to the fuel mixture screw location. Maybe I'm missing it but it's certainly not easy to find. So I got down to carb level and I'm suspecting the screw is located on the front bottom of the carb. I was hoping not to have to pull the carb to pull the plug out, but it looks like I may have to.


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So I broke out the $60 service manual and from what I could find, there's absolutely no reference to the fuel mixture screw location. Maybe I'm missing it but it's certainly not easy to find. So I got down to carb level and I'm suspecting the screw is located on the front bottom of the carb. I was hoping not to have to pull the carb to pull the plug out, but it looks like I may have to.


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You can do it in-place - Turn Carb in-place: (disregard where screw driver is..)

Turned carb..jpg
 

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sounds to me like your low speed circuit may be a tad too rich. Since cold air is more dense than hot air, your intake is drawing more air molecules per unit of volume in cold weather than in hot weather. If it ran well in cold weather but now struggles to start with warmer weather, you're likely a bit too rich (less air mixed with same amount of fuel.) If the choke doesn't help starting in the warmer weather, that reinforces the rich condition. If this is indeed the case, opening the pilot screw further (adding more fuel to less air) will only exacerbate the problem. Just my 2 cents based on your symptoms
 

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Discussion Starter #11
sounds to me like your low speed circuit may be a tad too rich. Since cold air is more dense than hot air, your intake is drawing more air molecules per unit of volume in cold weather than in hot weather. If it ran well in cold weather but now struggles to start with warmer weather, you're likely a bit too rich (less air mixed with same amount of fuel.) If the choke doesn't help starting in the warmer weather, that reinforces the rich condition. If this is indeed the case, opening the pilot screw further (adding more fuel to less air) will only exacerbate the problem. Just my 2 cents based on your symptoms
That was my initial thought as well since it starts so well in cold weather without the choke. It's been this way since I bought the bike which has been mostly during the colder season. Now that we've had warm weather, all of the sudden I need the choke to start it, when it's above 80 out.

So here's how yesterday went.
I went out in the garage at 6:45am. Temp was 49 degrees outside and my garage was 60ish. I pushed the bike out in the driveway, hit the starter button with no choke and it started and idled perfect within one second of hitting the start button. Drove a couple miles to work, parked it, and went in. At 11:15am I walked out to go to lunch. I unlocked the disc brake lock, put the key in and hit the start button. It turned over a few times and nothing. Did it again for maybe 5 or 6 seconds and still nothing. Pulled the choke half way and it lit up in a second or two.

It ran perfect all the way home. Shut it off when I got home. Decided to try and start it again within a minute and it lit up immediately. Parked it in the garage and ate lunch. An hour went out to start it and it turned over a bunch of times and needed the choke to halfway again. Started and ran perfect back to work.
 

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Thats very strange. It seems totally backwards. i assume you turn off the petcock each time you park? Seems like one of the carb circuits (idle?) is plugged when hot.

I wish I had your weather, but I am glad I do not need a disc lock, I am 15 miles from the border of Detroit and I leave my key in my ignition ll the time. My parents (lived in the same town I do now) didn't even have keys to the house when they sold it, never locked the doors :)
 

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Same area and I have my TWs at almost 3 turns out. Both start immediately when cold, with the choke all the way out and no throttle. Then push the choke/enrichment in to the halfway point.
I usually let them warm up for a minute or two but mostly because of inexperienced riders use one of them.

If they are warm they will start without the choke, and no throttle, right away.

I was surprised on Sunday when I went riding that they both needed the choke to start since it was probably already 75F outside.

I don't know why you'd need the choke with warm weather but not when it's cooler.
 

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Thats very strange. It seems totally backwards. i assume you turn off the petcock each time you park? Seems like one of the carb circuits (idle?) is plugged when hot.

I wish I had your weather, but I am glad I do not need a disc lock, I am 15 miles from the border of Detroit and I leave my key in my ignition ll the time. My parents (lived in the same town I do now) didn't even have keys to the house when they sold it, never locked the doors :)
Why turn off the petcock when parking? I do not do that. Should I?
 

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Why turn off the petcock when parking? I do not do that. Should I?
Turn it off.
If the float sticks your carb could overflow and empty the entire contents of the tank onto the floor :(
 

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I was thinking maybe the float is out of adjustment and when you close the petcock overnight or leave it sit, it comes up to the right level, but when the petcock is left open it some how doesn't come to the right level? I really have no clue, just thinking through possibilities with you. You should always close it off when you park it btw.
 

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Discussion Starter #18
Ok so I think I may have noticed something today. Usually when I get to work I'm running late so I speed through the parking lot and coast to a stop killing it before it has time to come to a smooth idle. So today I gave it maybe 15 seconds of idling before turning it off and it started perfectly every time. So I'm definitely thinking now it's probably some kind of a lean condition that probably has to do with the pilot circuit / fuel screw. Strange cause I do this in cooler weather it has no effect on starting, on in warm temps. We have to leave town this Friday for the state wrestling championships for my son, but when I get back I'm going to mess around and adjust fueling a bit.


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I would be interested to hear if turning your petcock on and off at the beginning and end of each ride changes anything. I remember years ago a friend left his petcock on on his motocrosser. The engine and expansion chamber FILLED with fuel. I remember removing the pipe and dumping out a large amount of gasoline... like a couple of cups. Perhaps a small similar leak is causing your odd rich condition at cold starts on a bike that is notoriously lean on the idle circuit.
 

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If its working good and starting cold, but not hot have you considered what fuel your using? Its a new bike, 2016 I doubt if anything is worn out. What does your dealer say? Yes, always shut off the petcock when parking.
 
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