White smoke coming from exhaust

White smoke means water so there is an internal water leak into your combustion chambers causing the smoke. Possible head gasket starting to leak.... Blue smoke is oil and black is gas as far as the smoke emitting from the exhaust. Have you needed to fill the radiator lately? Good luck.

Automatic carb may require adjustment.
Also have you checked any oil levels.
Too much oil is worse than not enough oil.

Is any extra smoke coming from the exhaust ?

Is it condensation or actual smoke? White smoke is associated with diesel mixed in petrol and with quite strong smells. I suspect that it is condensation as water vapor is a by product of combustion and the motor/exhaust will have to warm up to clear it. Check for water droplets at the end of the exhaust to confirm condensation. Burning oil will cause a blueish smoke to emit from exhausts.

First check carb gasket. White smoke usually mean cooler leeks (for liquid cooled engines)- suspect head gasket. But this is just if smoke coming from exhaust not engine.

Hi, Anonymous your instrument gauges and lights can alert you to most electrical and engine issues they can not warn you about failed engine gaskets or seals so your engine has to resort to old fashion alert methods of colored "SMOKE SIGNALS" here is a breakdown of their meaning:
1. COLORLESS OR SLIGHTLY BLUE SMOKE on start-up means your air/fuel mixture is the right composition and everything is well burnt in your combustion chamber.
2. BLUE SMOKE on startup is usually caused by failed valve seals dripping oil into the combustion chamber when the engine is not running.
3. YELLOW OR BROWNISH SMOKE at start-up means your air/fuel mixture is too lean. Too lean means that there is low fuel but high air mixture in your combustion chamber.
4. WHITE SMOKE on startup may be caused by a blown head gasket allowing coolant to enter the combustion chamber and may start dripping out of the exhaust pipes or mufflers. Smoke while riding is usually caused by worn out or damaged valves, seals, guides, pistons, rings, or cylinder walls.
5. BLACK SMOKE on startup is usually caused by too much fuel in the combustion chamber this can be due to air/fuel mixture adjustment too rich, accelerator pump improperly adjusted, faulty choke or not in the off position, air filter dirty and clogged, faulty carburetor float needle and seat, pilot jet too large, fuel injectors leaking, smoke while riding is usually caused by the main jet being too large or a damaged carburetor.
It should be noted that aggressive or abnormal throttle operation will cause these conditions to manifest themselves exponentially.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the links below and for more specific information or questions at no charge feel free to contact me at [email protected]. Good luck and have a nice day.
https://www.hdforums.com/forum/evo-classic-models/1178646-white-smoke-at-idle.html
http://www.mediafire.com/file/6b1dhde35ukpnnc/84_to_98_FL-FX_Harley_Service_Manual.pdf/file
https://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
https://serviceinfo.harley-davidson.com/sip/service/document/6300?highlight=1998+sportster+owner
https://www.6ya.com/ to speak to me personally

Replaced the carburetor had gas In oil. Changed oil, synthetic, 10/30 wt. Adjusted the valves. Started hard flywheel froze. Finally started then jackrabbit. Adjusted the carb throttle, was blowing blue black smoke now blowing white smoke through the exhaust. During one of restarts it didn't blow any color exhaust. Stumped. Riggs n stratton 18.5 riding mower. On fixed income need some close answers

replace plugs also on carb there will be a mixture screw the person probably adjusted this you need to turn this out and see if it improves 1/2 a turn if not screw it in 1 turn if still no difference fiddle with it also replace/clean air filter this may help good luck bud

sounds like you have a dirty carburetor.

broken valve or valve guide