Hello Sing...
1. No, it is not normal. Check your voltmeter first... Should be not less than 12,6 -12,8 V
BTW. You choose very good battery
4. K&N is good for tarmac, but I have seen that many AT consume oil with K&N (especially when this filter was not cleaned proper way). So put normal paper filtr inside and look what will happen... Angle of exhaust doesn't have any influeance. Why you use 20W50? So hot in South America?
Valve clarence is not difficult and can be done by every mechanic. BTW it is the time to do it in your AT.
Check your sparks and tell us something about their colour. Probably your carburattor also need inspection... And it should be done when you replace K&N for normal filter.
greetings
Sambor
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