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8th August 2012
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Bike Builder
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Join Date: Mar 2011
Posts: 1,890 Sportster/Buell Model: xlh convert to xlch Sportster/Buell Year: 1978 Sportster/Buell Model #2: xlch Sportster/Buell Year #2: 1972
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why would bike try to fire a couple more times after shutting off the key?
happend to me once the other day, and now again. but whet to shut the bike off and it popped a few more times then shut off. what is the cause of this??
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8th August 2012
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Senior Chief Master Mechanic 2nd Class
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Join Date: Jun 2011
Location: On a farm
Posts: 1,530 Sportster/Buell Model: XL77.2R Sportster/Buell Year: 2006
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Hot and rich, carbon build up leading to dieseling.
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8th August 2012
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Senior Custom Bike Builder
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Join Date: Feb 2006
Location: Spartan Country - Michigan
Posts: 2,619 Sportster/Buell Model: 1200 XLH Sportster/Buell Year: 2002
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It's called dieseling. The motor gets hot and there's just enough fuel in the cylinders to ignite. Could be poor gas,excess carbon build up, toofast idle...several different things. You might want to let it idle down a few seconds before you shut down?
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Denny
"If you're looking for sympathy, you can find it in the dictionary between shit and syphilis."
Old Bubba of the Booze Junkies MC
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8th August 2012
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Know It All
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Join Date: Mar 2012
Location: Elyria
Posts: 165 Sportster/Buell Model: Harley Sportster XLH Sportster/Buell Year: 1974
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IDK bad coil or points set up. or switch is cracked.
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8th August 2012
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Know It All
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Join Date: May 2011
Posts: 189 Sportster/Buell Model: XLCH 1000 Sportster/Buell Year: 1975
Reputation: 87
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My stock 75 XLCH did the same thing today and a couple other times. I have a bendix carb 1 5/8 out on the adjustable main stock air cleaner 1 3/4 drag pipes. I was thinking I needed to adjust my valves. I'm also getting towards the end of my break in on a new top end. Which bike was it? The 78 or the 72?
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8th August 2012
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XL FORUM TEAM MEMBER
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Join Date: Feb 2011
Posts: 805 Sportster/Buell Model: XLCH Sportster/Buell Year: 1968 Sportster/Buell Model #2: XLH1200 Sportster/Buell Year #2: 1991 Other Motorcycle Model: Chopped Shovel Other Motorcycle Year: 1978
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Timing is a possibility to add to the above mentions.
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Disclaimer: I'm not the guru on this stuff, be sure to seek further opinion/knowledge.
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8th August 2012
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Custom Bike Builder
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Join Date: May 2009
Location: 37° 17' 45" N by 79° 53' 49" W
Posts: 2,433 Sportster/Buell Model: XLCH Sportster/Buell Year: 1975
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mine does it on occasion too, but mine's really unpredictable. i'll second carbon build up and timing. other folks agreed with that diagnosis when it happened to me too...
http://xlforum.net/vbportal/forums/s....php?t=1117590
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8th August 2012
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Bike Builder
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Join Date: Mar 2011
Posts: 1,890 Sportster/Buell Model: xlh convert to xlch Sportster/Buell Year: 1978 Sportster/Buell Model #2: xlch Sportster/Buell Year #2: 1972
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i think it was just shitty gas. just put new points in it and timed with a light. after reading the above post i was almost empty anyway, so i went and filled up with some 91 and added a little octane boost and now its not doing it.
but im sure there is a lot of carbon build up in there. 40 years worth to be exact. top end is due i think. burns oil, smokes a bit.
i just went into panic mode cause im leaving to sturgis right now. good to go now, its getting rode.
thanks for the responses.
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8th August 2012
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Banned
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Join Date: Apr 2011
Location: Deep South
Posts: 1,613 Sportster/Buell Model: XLH Sportster/Buell Year: 1976
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Mine's done that a couple times, hasn't in a long time, but I just figured it's hot and it was turned off at the right time to fire.
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8th August 2012
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Senior Master Custom Bike Builder
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Join Date: Dec 2007
Location: Australia
Posts: 7,847 Sportster/Buell Model: XLCH 1000 Sportster/Buell Year: 1977 Sportster/Buell Model #2: 75 motor in Norton frame. Other Motorcycle Model: 42WLA 45, Harton, Narley Other Motorcycle Year: 1942
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Hold the throttle open after turning off the switch. The extra air flow blows out the fire and it stops dieseling.
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