I have 2000 xlh sportster 1200 the bike idles fine runs fine but will shut off when oil guage reaches a little over 150 degrees any ideas

Check the cam sensor in the nose cone on the right side of the engine. Due to heating cycles, the epoxy melts over time and the wires don't make contact. Pretty sure replacing it will solve your problem,. You will have to time the bike after replacing the sensor, though.

follow this link and download everything you need to know about your bike

http://www.downloadninjas.info/service-manuals/harley-davidson-sportster-xl-xlh-service-repair-manual-for-1986-2003-models/

Are you sure it is a 1340 and not a 1200? Most Sporties that have the displacement bumped up started life as a 883 and were bumped to a 1200. That involved new pistons and cylinders, and related gaskets and tuning, that's about it.

you have a bad bulb the hazards work off the brake light side of the dual fillament in the rear bulbs change the right rear turn bulb and all should be good if not look under the seat for a pinched wire

Little tip -The only time the oil cooler will cool is when the bike is moving and when the bike is moving you don't need the oil cooler. This is from a factory harley tech.

My bike does the same thing. I think it's the brake pads dragging a little. I brought to the shop and that was their opinion. they adjusted it and reduced the sound but it still does it to a lesser degree.

Your ign pick up is bad. Pull the little cover on the right side of the motor off ( usually riveted on ) see if the plate is mushy if it is then replace it with the screamin eagle ign plate. It's cheaper than stock and you get a little performance boost as well.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_5bac37c3cb991fdb

Charge up the battery, check the battery connections, sounds like a discharged battery

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