I had a head gasket blow out last fall. I have changed it, no problem there. My problem is getting the timing set. You have two cams that have a mark on each. EX on the front and Z/1 IN or something like that. Anyways what they say, going off memory, is not important. It is a super pain to get both these marks set exactly flush with the top of the motor like they need to be. You set both marks, then when you tighten down the cams with their holders and put in the chain tensioner, it always moves just a little. One may be exactly on but mostly the front mark is down a 1/8 or so inch. This seems to be the problem with the engine not wanted to start, backfiring out the back of the carbs, and when it does start after dumping gas in the air cleaner, it runs crappy wanting to stall and not revving up all the way. I have tried putting the tensioner in first then the cam holders and vise versa.
Is it just a matter of doing it 500 times until you finally get it right? Has anyone dealt with this problem and found any easy ways to set trimming? Beside taking it to a shop and getting charged a few hundred bucks?