Oil leak up threw 1 head bolt on Honda 100cc - Motorcycles

SOURCE: oil in coolant on a 1981 honda goldwig

do you have oil in your coolant ? if so id say head gasket , be extremly unuasual for the head to crack on a goldwing, id put it down to head gasket , but while its appart id have it skimmed and when its being skimmed if there half decent company doing it the will tell you if its cracked when the pressure test it , head skim will cost about £45 from most companys as its only a small head on your bike ( compared to car heads which cost a bit more )
hope this is of help to you
kind regards
bert31000

SOURCE: small oil leak around head, could I just tighten

Sorry, but the fix is a new head gasket. Tightening the head bolts is asking for trouble. If it's just a small leak I would consider just living with it and cleaning it off occasionally.

SOURCE: I need to know how

If it is on the right hand side of the bike then yes. Remove the clutch cable by undoing the adjustment nuts on the engine side of the cable and unhooking from the lever. Remove the nut on the gearshift pedal and pull of the pedal. Remove the dipstick. Undo all the nuts on the cover, and remove it. Locate the new gasket on the engine. There are 2 locating dowels so it should not have diffyculty staying in place. Replace the cover and clutch cable and readjust the clutch cable.
On the left hand side of the engine is a bit more tricky as the oil is not leaking past the gasket on the cover itself. There are 2 places where it can leak from. One is behind the drive sprocket. Remove the cover. Undo the nut on the sprocket. Bend back the tabs on the locking plate and remove the sprocket. Drive a self tapping screw into the shaft seal and pull it out with a pair of pliers. Drive a new on back in place. Also see this : http://www.fixya.com/motorcycles/t5649906-1996_yamaha_yz250
If the leak is from behind the alternator you will have to remove the magneto. This is diffycult as you need a puller to get the flywheel off the crank. Then the alternator assembly and only then will you be able to reach the shaft seal. This can be removed as per the previous link.

Testimonial: "Thanks a million. very helpful"

SOURCE: over torqued and snapped off the head of the oil

Is the remainder of the bolt still in the threads??? Get a good bolt extractor to remove it.
If the remainder has gone in the engine, if you can't get at it with a magnet (get it to the hole and thread it out) you will have to get the engine split.

SOURCE: i had my head ported out and now it leaks oil out where my exhaust mounts to the head is it safe to run my bike like that

It is not normal, The oil is coming from the engine lubrication system and it sounds as if you have not renewed the rocker cover gasket when the engine was rebuilt. Check the torque settings on the head bolts and that no oil is getting into the coolant.