Need Yamaha 80 help fast

[Lomax]

I have a little 89 Moto-4 80cc atv here and I just got done rebuilding the topend but i cant find the timing mark anywhere on the cyclinder head. this thing is driving me nuts, can anyone give me at least a general idea of where it is supposed to be at (no wise cracks please :) ). I am trying to get this thing out of my garage this afternoon so i can make way for another machine. Thanks
-Will

[Jason Hall]

I have an 86 moto-4. The top end timing mark is a triangle dimple on the head under the round cam gear cover (cover with 2 philips screws). If you pull the left side cover off you can see the crank mark. The later model 80's might have a sight window for the crank mark I'm not sure.