Question about 2005 Harley Davidson XL 1200 C Sportster Custom

2 Answers

Harley runs nice in 40-50 deg. weather only

2005 harley davidson XLC . Here's the story, Ride the bike for about 20 miles. Throttles up and down ok through town and on the highway. Now get off the highway come into town to your 1st stop light and stop. Now let the throttle drop to an Idle sitting at the light. Engine still behaving idling nicley. Now, the fun begins. The light changes green and you "try" to throttle up and it sputters,pops, almost sounds like running out of gas. Let up on the throttle and it Idles nicley again. Pull off to the side of the road, shut off the bike and wait for about 15 min. After 15 min. the bike starts up ok and the throttles corrected. Now, prior to this I have ridden my bike in 40 deg. weather with no problems. Also, I have done the air filter, oil filter ,oil change , both spark plugs ( .040) and a new battery. For my 10K mile scheduled maintenance. Now , I noticed my "In tank temperature Guage was above 150 deg. when this happens. When the temp. drops below 150 deg. the bikes ok.Or is this a coinsidence. Now heres the kicker, when I ride at 50 deg. or below non of these problems occure. On changing the plugs , I noticed a small sooty black on the threads and electrode, but the porceline is almost still white.and sparks ok. Now from reading spark plugs in the past you would think I was loading up from the carb.But this dose'nt happen when it's cold out . Could this be a temperature related thing.on an air cooled engine? Today , I took the bike for a short ride ( 5 miles) to warm it up . On the way back it started to do the popping thing again when releasing the throttle to Idle. I'm still rolling, I down shift , pop the clutch out to assist the engine back up to speed and give a little throtte.Engine is running ok again as long as I keep the RPM's Up. Possible carb trouble? If so. Why only when weathers warm? Thanks for listening , hope theres a solution. Tom

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  • tpaddack57 May 13, 2009

    Hey Tim, Thanks for responding to a fellow rider. I am using Harley Davidson Syn 3 oil and I only use premium fuel. That is a good Idea about standing up away from the engine to assist in cooling.Thanks again. Tom

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Hey Tom, gonna try and help ya here...typical vapor lock/overheating is what your describing and i sure hear a lot of it w/harleys...are you using a very high grade synthetic oil , like castrol Syntec Actevo ? are you filling up w/ premium gasoline ?
make sure your timing is not too far advanced and don;'t let it idle too low...when you come to a stoplight stand up for a strech while letting your engine get air not blocked by your legs....all these things will help greatly......Good luck to you friend...Tim

Posted on May 11, 2009

  • tim winter May 13, 2009

    Thanks for the response, check that timing when you get a chance and back it down a degree or two...Tim

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The bike is running too lean,and needs to be rejetted.

Posted on Sep 26, 2012

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