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BGB = Big Green Book, The MR2 manual, for the 89 at least has green and black covers and is about 2" thick, thus BGB.
Stock timing for the 89 is 10 deg BTDC, which is about where I set mine, hard to see on the BT but I'm real close.
Cams, belt and tensioner. I replaced the cam belt on mine, and the seal and oil in the tensioner as well as the tensioner pulley and bearing. (I'm funny that way, I'd rather spend money now than have to go back in three months and replace parts that are 50K + mile old. But that's just me.)
The 16 valve has a spring that you use to adjust the tension on the cam belt, the 20v BT uses an entirely different hydraulic spring device to hold the cam belt tight. It bolts on the intake side of the engine above the crankshaft pulley. You have to grind a notch in your alternator bracket (16v) to get it to fit on the engine around the tensioner.
But use the 20v alternator if you can as it's electrical outputs are lower and don't hit the airbox.
Cam timing according to the original 89 BGB - Timing marks on both cams straight up, knock pin on intake side just about straight up about 11:30 on a clock and the exhaust about 5:30.
Hope this helps.
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