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Hot weather=no choke needed?

  • Thread starter Thread starter physics-teacher
  • Start date Start date
P

physics-teacher

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Has anyone else found that in these 90 degree days you can start your GS even after cooling off all night without any choke whatsoever? Or does this mean my GS650G was jetted too rich by a PO? When I bought my bike I was shown a bag of carb jets that had supposedly been taken out by a PO and replaced, but I've never delved into the carbs to see what's in there. Anyway, my bike will start right up and idle smoothly without benefit of the choke these days.
 
Any mods to the bike? It might be telling you the idle mixture screws are rich or the pilot jet is rich.
I choke my bike at 100 degrees +.
Start the bike w/out choke. Let it idle for a few minutes without touching the throttle. Kill it and read the spark plugs.
 
I have a 650 here with pods and a pipe, it needs about 20-30 seconds of choke before it will idle smoothly. The 850 needs about a minute or so. Sounds like yours is a bit rich, but read the plugs, like Chef suggests, to see just how rich. 8-[


.
 
My GS1100GK will start in warm weather without choke. Just push the button, give it a little gas, and a few seconds later it's idling just fine.

This is the 8th riding season I've had this bike, which has a total of 121,000 miles, of which 96,000 are mine. It's always behaved this way, starting in summer without choke. I consider it normal, therefore. My fuel mileage is a dependable 40 mi/gal.

My two GS850GZ's, which I rode from 1986 thru 1996, did the same thing.

Even in cooler weather, I don't have to choke much, or for very long.
 
My 850 won't start cleanly without choke, even in 38 degs C temps. This is especially true after a spell of 2-3 days since it's last run. I takes around a minute before it will idle without choke. In winter months, it takes 2-3 minutes before being able to pull away with around 1/4 choke.
Your carb jetting is too rich if you don't need some choke after a 24 hour break.
 
If my bike were jetted too rich, then

1. My plugs would indicate that it is. They don't, year after year.

2. My fuel mileage would be much less than the 40 mi/gal I've been getting since I bought it 8 years ago.

3. I would spew black smoke out the tailpipes, which I don't. I lead group rides often, and people behind me would've informed me of a condition such as this.

I had a 1979 GS850GN which took forever to get warmed up with the choke, so, 49er, this is not unusual for this bike.

My GS1100GK has stock exhaust system and the stock jetting. How can it be rich?
 
If all is stock.The GS 1100GK could have the float levels set too high or the pilot screws are set rich.
 
I will check the plugs at next opportunity. My thinking is that in the hot weather the carbs are probably warmer after sitting all night than they would be after five minutes of riding in mid-winter.
 
Grandpa said:
If my bike were jetted too rich, then

1. My plugs would indicate that it is. They don't, year after year.

2. My fuel mileage would be much less than the 40 mi/gal I've been getting since I bought it 8 years ago.

3. I would spew black smoke out the tailpipes, which I don't. I lead group rides often, and people behind me would've informed me of a condition such as this.

I had a 1979 GS850GN which took forever to get warmed up with the choke, so, 49er, this is not unusual for this bike.

My GS1100GK has stock exhaust system and the stock jetting. How can it be rich?
Click to expand...

Ok, horses for courses. I still think that Walt could have a valid point!
 
If your plugs aren't fouling and its smooth I wouldn't worry too much. You might be a little rich.

How's your air filter? Do you live on a mountain?
 
My 650 sits in an air conditioned garage and requires 2 minutes of choke before it will idle at 1000 and after riding hard and stopping it will be at 1100 to 1200 in this intense heat.It usually always idles at 1100. All 4 plugs are perfect when pulled to check.Dont worry about it, just ride!!!
 
tconroy, you're right. Some folks around here tend to worry too much and not ride and enjoy enough.
 
If you know your bike well it will tell you when there is something wrong.Just dont ignore the signs.A few months ago everyone around here told me I was working on my bike too much but now its them saying "my forks are leaking, my cam cover gasket is leaking,my plugs are fouling etc.etc.etc, and Im riding all the time with my bike in top condition while there whining about the problems they have had since spring and neglected to get on them and get them fixed!
 
tconroy said:
If you know your bike well it will tell you when there is something wrong.Just dont ignore the signs.A few months ago everyone around here told me I was working on my bike too much but now its them saying "my forks are leaking, my cam cover gasket is leaking,my plugs are fouling etc.etc.etc, and Im riding all the time with my bike in top condition while there whining about the problems they have had since spring and neglected to get on them and get them fixed!
Click to expand...

Yeah, there's no substitute for regular maintenance. It doesn't need to be over the top either. You can't beat a reliable set of wheels, whether they're 2 or 4.
 
Just a couple of hours a week to look things over and tinker will keep it running ! I just took my speedo cable off and greased it today and it took all of 15 minutes to do.Taking the back brakes out and cleaning them up and the pins and posts takes about 1/2 hour at most.Just little things like that will help tremendously.Dont forget to check your tires and air pressure before you ride too! I cant afford a new bike so this one will have to do for a long time.
 
From what I've seen, most GS's are pretty lean on the pilots as set from the factory. Most the guy's around our local bike shop, would go up a size or two on the pilots, just so the wouldn't need to use the choke as often. Not to say it hasn't happen, but I never remember anyone who had a GS, with stock pilots, that would start without choke first thing in the morning. Larger pilots will affect the higher rpm jetting, but contrary to what others may think, it is so minimal, no one could tell. Won't change the higher rpm plug readings at all.
 
rphillips said:
From what I've seen, most GS's are pretty lean on the pilots as set from the factory. Most the guy's around our local bike shop, would go up a size or two on the pilots, just so the wouldn't need to use the choke as often. Not to say it hasn't happen, but I never remember anyone who had a GS, with stock pilots, that would start without choke first thing in the morning. Larger pilots will affect the higher rpm jetting, but contrary to what others may think, it is so minimal, no one could tell. Won't change the higher rpm plug readings at all.
Click to expand...
You probably wont believe this but my carbs still have the factory plugs in on top of the air screws.I have replaced the o-rings in everything else but never drilled the plugs out.The bike runs excellent and idles perfect.I dont know how this is possible myself other than it always had a fuel filter inline I do run seafoam in it like once a month.I took the fuel filter off a year ago and replaced the fuel line.If it doesnt give me problems Im not going to tear into them.
 
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