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Discussion Starter · #1 ·
Why does my bike die warming up when it's cold and wet? It sat outside for about 3 hours in light slush-fall, I went out to start her up (just as it started coming down harder), and with the choke on the engine slowed down more and more until she gave up and died. This was in a couple of minutes. She started up beautifully, aren't bikes supposed to run better once warmed up??! WTF

I tried heading out to see if some motion might persuade her. I had to open the throttle a little in addition to the choke being on to prevent her from dying whenever I pulled the clutch in (or put her in neutral). She still didn't seem very happy a little bit down the road, so as I was wiping the slush from my visor to see I said screw this and turned around.

A nice guy with a truck happened to be there and offered to lift me home, which I graciously accepted, but I'll admit that all the Youtube movies of inexperienced guys loading their bikes into stuff and the bikes dropping were running through my head the whole time. We both made it home in one piece though [clap] [clap]

It was about 30-40 degrees I do believe. This sort of thing has happened before when it was somewhat cold (40-50s) and rainy, but not as bad. I'm guessing something with the carbs?
 

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My monster will die if I leave the choke on too long also. I use it for 30-60 seconds and shut it off and use the throttle until it will idle. The "choke" is actually an enrichment device. As the engine warms the mixture becomes too rich to support idle.
 

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Discussion Starter · #3 ·
No crap, and here I was this whole time thinking it just increased the throttle. Dang it, I need to learn more about how this affects things. So would it be better to just use the throttle until she warms up? Why is the choke designed this way?
 

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Aguacate said:
No crap, and here I was this whole time thinking it just increased the throttle. Dang it, I need to learn more about how this affects things. So would it be better to just use the throttle until she warms up? Why is the choke designed this way?
The early FI bikes had a fast idle system.
A cold engine starts better with a richer mixture. The Mikuni doesn't seem to have much of a fast idle mechanism like a carbed car. It also doesn't have a choke plate like a car, but has a little plunger that rises when you activate the lever which enriches the mixture.
When I start mine the idle does rise, but does the same as yours after about a minute, and will stall.
Use the choke to start, but slowly back off on the lever as the idle drops. You'll get the hang of it.
 

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howie said:
At least the enrichment system does work better than a tickler and kick start :p
Those Amals weren't tuned right. [laugh] [laugh]
 
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