Re: 8BA timing
All indications are that the timing marks are off for some reason. Are you using a dial-back timing light? These things can fool you! After you double check your TDC mark, try using a different timing light, if you haven't already.
If the initial timing is really 6 deg. ATDC, the engine will start easy and idle smoothly, but will be quite doggy.
If total timing is only 12 deg., it is apt to overheat at road speeds. If you start the fire late, it is still burning when the exhaust valve opens, so raw flame is going past the valve and down the port. If timing is right, the fire is done burning when the exhaust valve opens, so only hot exhaust gasses are flowing out.
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