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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 15th August 2022
Racepres Racepres is offline
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Not using an Inline filter are we??
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  #12  
Old 15th August 2022
trappnman trappnman is offline
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What happens- imo of course- is that when you are running in hot temps, and bike is hot, when you shut it off at a stop, the temps keep increasing... and your cylinders dry out. so when you try to kick it- its not flooded , in fact just the opposite is true- there isn't enough gas.

so it coughs- then you twist throttle, etc to "give it gas"...and now is flooded.

Best thing, is to not give it any priming or compression kicks before turning on the key- turn on the key, and slowly find the compression point, then kick. Should fire right up. If not, hold throttle a bit open- and give it several rapid kicks- and it then should start.

and monkeying or guessing flooded or not, usually makes things worse.
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  #13  
Old 15th August 2022
Racepres Racepres is offline
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Especially with kicker...If really hot, and the bike has Not sat for very long since running.
I always put enricher/choke on, for one kick... then off and kick normally...always starts
remember...raw gas has a cooling effect.
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  #14  
Old 15th August 2022
Chuckthebeatertruck Chuckthebeatertruck is offline
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Another silly tip that often helps on hot days is to not open the petcock until after the bike fires.

What's happened lately is that the acceptable "range" of fuel additives, including corn juice, has been slackened a bit. As such, you may or may not be getting the same quality fuel as just last year. Specifically, I'm finding the fuels this year are particularly bad with any type of heat soak. Summer blend fuel is supposed to counter act this . . .but it sure doesn't seem that way this year in the central midwest. Your location may vary.

And, yep, once the mix huffs out . . .you're super lean.
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  #15  
Old 15th August 2022
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Yeah, the more I think about the symptoms and the eventual remedies, the more it seems the cylinders just dried out and it was left in a super lean state. I think any "normal" incoming charge, being introduced through the idle circuit alone (and by kicking rather than electric start), just flashes off before it even makes it to the cylinders. So, in light of that, both approaches that worked - letting it sit in the shade and cool for half an hour, maybe 45 minutes on the one occasion, and pulling up the enrichener on the other occasion, seem to fit. The former allowed it to cool enough to not flash off that incoming mix, the latter added enough fuel so that even if a bit of it flashed off, there was still enough to light. I think I'll try that second approach if it does it again, since I don't always have 45 minutes to kill at a gas station.
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