G'day I own a 2004 XL1200R Sportster I only had the bike for a few months now it's got just over 25,000k on it I haven't been able to put to many ks on it myself because of work and the shitty wet weather we have had but since I owned it about three times this has happen after I turn off the ignition to shut down the motor it over runs for a few seconds.

Now as I said it is a 2004 carby model I say it should have electronic ignition and not points and the original Harley points cover is still fitted to the bike so I say that this has never been touched the motor only seems to over run when I been riding around town at the 50/60 kph speed limit and the motor is hot I am no mechanic far from it just taking a guess here could the bike be over fuelling from riding around town and when I shut down the motor it's just burning the extra fuel as I said it's only done this now and then any feedback would help.

First thing to do is buy a manual, check timing, plugs and intake for leaks, could be carbon build up in combustion chamber, when was the last service. Try and have a go yourself it will build convidence, ask for help when req.

Thanks last service was done at 24,000k I got all the paper work from when the bike was new and it's never missed a full service might have to go back and have a look if the plugs have ever been changed and I forgot to add the bike is fitted with aftermarket slip on mufflers so I don't know if the jetting was changed on the carby as well and to be truthful I don't know if that would affect it on not?

Thanks everyone I am 99% sure what is wrong with my bike and it's my fault and hopefully now the problem should be fixed cheers.

so give.....what did you do......

LOL arnt we all

Yer Bucket you are having one of those days lol and shit did I turn off the ignition all the way yer I did.

Ok having not owned a Harley in a while this bike is a 2004 model and it is the latest model I have ever owned and when I bought this bike and it was from a Harley dealership I asked what grade fuel I should run in it and the alarm bells should of rung when the salesperson said as far as he knew straight unleaded should be ok I should of checked up then to see if this was right.

Now after posting this question here about the engine over run I did some surfing on the net to other forums only to find out that I should be running premium unleaded in my bike my fault I should have read the owners manual first and not just taken someone else's word on what fuel to run and the manual itself states that the 883 Sportster should run a 91 octane rating which is straight unleaded and 1200 Sportster should run a 95 octane which is premiun unleaded failue to do this can cause pinging or pre-ignition and now it makes sence to me because every now and then a run a tank full of premiun and no trouble and when I go back to just straight unleaded then I get this motor over run sometimes when it's hot so I just run premium fuel for a while and if that does not fix the problem next step will be the carby mixture.