QuestionJust 2 weeks ago I went to start the bike and I had full choke + full throttle and it just was pumping out white smoke I am pretty worried about it I have only owned this bike for 4 months but previous owner never took bike to be serviced properly.I am in NC in December I have re jetted the carb and still made no difference.I do own a clymer repair manual.
AnswerRichard, If the bike has been sitting for a couple of weeks with old gas in the carb, the idle jet is probably plugged up, which makes them hard to start and then they won't idle at all.
WHITE smoke is basically water vapors trying to evaporate from the cold air inside the exhaust system.
BLUE smoke is oil burning, which would relate to valve stems/stem seals and/or piston rings/cylinder damage.
If you keep kicking and kicking with the choke on, you may have fuel fouled the spark plug, so even with everything clean and set properly, it won't start easily.
If the bike was not maintained, then I would immediately check the valve clearances, which are only .002" cold on both intake and exhaust valves. This is often overlooked, and when the clearance gets down towards zero, you don't have much compression to start the engine with.
http://houseofmotorcycles.bikebandit.com/honda-motorcycle-xr100r-2000/o/m9702
for illustrations of the parts on this bike.
If the bike is stock.... completely...intake and exhaust, then rejetting is not a good action to take while you are sorting out this particular problem.
To get an engine to start, you need compression, spark at the right time, correct fuel/air metering at various throttle settings. If anything is missing or readings are low, then you will not have a running bike engine.
Clean the carb first, adjust the valves, put in a new spark plug and with a fresh tank of fuel, it should fire right up again.
Bill Silver
